Tools Studio (283)

Cocktail Balancer: The Sour Law

Calculate the perfect balance between sweet and sour for your cocktails. Master the golden ratio of mixology.

Beer Cooling Calculator with Newton's Law

Calculate with real thermodynamics — Newton's Law of Cooling — exactly how long your beer needs to reach the perfect serving temperature in the fridge or freezer.

Party Beer Calculator: Amount Per Person for Weddings & Birthdays

Free tool to calculate how much beer and ice you need based on guests, duration and temperature. Perfect for weddings, birthdays and outdoor events.

Beer Carbonation & Priming Calculator

Calculate the exact grams of Dextrose, Table Sugar or DME (Dry Malt Extract) for bottling your homebrew. Enter your volume, fermentation temperature and style for a perfect priming.

Hangover & BAC Calculator: Recovery Predictor

Calculate your Blood Alcohol Content (BAC) and time to reach 0.0 using Widmark's formula. Plan your pre-sleep hydration and know when you'll be fully recovered.

Jello Shot Lab: The Perfect Gelatin and Alcohol Ratio Calculator

Calculate exactly how much spirit and gelatin to use for jello shots that actually set. Avoid the runny or rubbery failures with science-backed ratios for any spirit strength.

Fortified Wine & Vermouth Builder: Pearson Square Calculator

Calculate exactly how much spirit to add to your wine to reach your target ABV. Craft perfect vermouth, port, and sherry with the Pearson Square method.

Astronomy Tools

Dark Sky Simulator (Bortle Scale)

Interactively visualize the 9 levels of the Bortle Scale and discover how light pollution erases the starry night sky.

Telescope Reach Calculator

Calculate the limiting magnitude of your telescope and discover which deep sky objects are visible with your equipment under your sky conditions.

500 Rule and NPF Astrophotography Calculator

Calculate the maximum exposure time for astrophotography without star trails. Classic 500 rule and high-precision NPF model for modern sensors.

Telescope Resolution Calculator (Dawes Limit)

Calculate the resolving power of your telescope with the Dawes Limit and Rayleigh Criterion. Discover the maximum useful magnification and the impact of atmospheric seeing.

Eyepiece Calculator & Visual Simulator

Calculate magnification, true field of view (TFOV), and exit pupil for any eyepiece with your telescope. Features an interactive visual simulator.

Audiovisual and Photography Tools

12 tools

Timelapse and Hyperlapse Calculator: Perfect Intervals

Calculate the exact interval between photos, total duration, and storage for your timelapses. Essential tool for photographers.

EXIF Metadata Cleaner: Remove GPS and Hidden Data from Photos

Free online tool to erase EXIF metadata, GPS coordinates, and camera specs from your images before sharing. 100% private: works without uploading photos to the internet.

Synchronize SRT Subtitles Online: Adjust Timing for Free

Online tool to advance or delay SRT subtitles. Correct timing offset easily and download the synchronized file instantly.

Online Privacy Editor: Pixelate and hide faces in photos

Protect your identity by censoring sensitive areas of your photos. Pixelate faces, blur documents, or cover private information 100% locally.

Chromatic Lens: Online Color Palette Extraction

Extract professional color palettes from any image for free. Identify dominant colors in your photos using mathematical algorithms.

Print Quality Calculator: Pixels to CM and DPI

Calculate the maximum print size of your photos based on their resolution. Convert pixels to centimeters and inches to ensure professional printing.

TV Distance Calculator: THX and 4K Optimal Screen

Calculate the ideal distance to watch your television based on its size and resolution. Optimize your Home Cinema with THX and SMPTE standards.

Online Image Compressor: Reduce weight without losing quality

Optimize and compress your JPG, PNG, and WebP photos for free. Reduce file size to improve your web loading speed locally.

Online Collage Maker: Design professional compositions

Create photo collages for free in seconds. Choose from multiple layouts, adjust borders, and download in high quality without watermarks.

Video Frame Extractor: Capture HD stills

Extract individual images from your videos with frame-perfect precision. Capture perfect moments in HD locally and for free.

Depth of Field Calculator: Realtime DoF for Any Camera

Calculate depth of field, hyperfocal distance, and near/far focus limits in real time. Supports all sensor sizes with 1/3 stop aperture precision.

Merge Videos Online: Join multiple videos fast and free

Merge and concatenate multiple videos into one for free, online, and locally. No watermarks, no uploads, 100% private in your browser.

Baby Calculators

Baby Feeding Calculator

Calculate how much milk your baby needs based on weight and age. Recommended feeds, milliliters per feed, and hunger and fullness cues.

Ultimate Baby Budget Planner

The definitive tool to plan your baby's first year expenses. Calculate nursery setup, monthly costs, and hidden expenses with smart saving tips.

Baby Size Converter

Convert baby clothing sizes between Zara, H&M, Primark, Carter's, Kiabi, Mango, and Mayoral. Enter your baby's height and weight to get the exact size for each brand.

Baby Vaccination Calendar in Spain

Calculate the exact vaccination dates for your baby according to the AEP 2026 schedule.

Fertile Days Calculator

Calculate your fertile window and ovulation date based on your menstrual cycle.

WHO Percentile Calculator for Babies

Calculate your baby's weight, height and BMI percentile using WHO growth charts (0-5 years).

Pregnancy Weeks Calculator

Calculate exactly which week of pregnancy you are in, your trimester, and your estimated due date.

Online Image Converters

21 tools

Convert PNG to JPG Online

Convert PNG images to JPG directly in your browser. No file uploads to servers. Fast, free and completely private.

Convert JPG to PNG Online and Free

Convert JPG images to PNG in your browser without uploading files. Lossless conversion, free and completely private.

Convert WebP to PNG Online and Free

Convert WebP images to PNG in your browser. Preserves transparency. No file uploads to servers. Free and 100% private.

Convert WebP to JPG Online and Free

Convert WebP images to JPG without uploading files. 100% private local processing. Transparent backgrounds are automatically replaced with white.

Convert PNG to WebP Online and Free

Convert PNG images to WebP in your browser. Up to 40% less file size. Preserves transparency. No file uploads. Free and private.

Convert JPG to WebP Online and Free

Convert JPG images to WebP in your browser. Superior compression without visible loss. No file uploads. Free, unlimited and private.

Convert SVG to PNG Online and Free

Convert SVG vector files to PNG in your browser. Double-scale HD output. Preserves transparency. Free and 100% private.

Convert SVG to JPG Online and Free

Convert SVG vector files to JPG in your browser. 2x high resolution rendering. No file uploads. Free and 100% private.

Image to Base64 Converter Online

Convert any image to Base64 code and Data URI directly in your browser. No file uploads. Free, private and instant.

Convert BMP to JPG Online

Convert BMP images to JPG in your browser. Drastically reduce file size. No file uploads to servers. Free and 100% private.

BMP to PNG Converter

Convert BMP images to PNG without quality loss. Modern compression without artifacts. No file uploads. Free and 100% private.

Convert BMP to WebP Free

Convert BMP images to WebP offline. Reduce huge files to kilobytes. No file uploads. Free, offline and completely private.

Convert AVIF to JPG Online

Convert AVIF images to JPG in your browser. No server. 100% private local processing. Free and unlimited.

Convert AVIF to PNG Online

Convert AVIF images to PNG preserving transparency. No file uploads. Processed locally in your browser. Free and unlimited.

Convert AVIF to WebP Online

Convert AVIF images to WebP with better compatibility. Local processing without servers. Free, private and unlimited.

Convert GIF to JPG Online

Extract the first frame of your GIFs and convert to JPG. No server. Processed locally in your browser. Free and unlimited.

Convert GIF to PNG Online

Extract the first frame of your GIFs and convert to PNG preserving transparency. No server. Local processing. Free.

Convert GIF to Static WebP

Convert animated GIFs to static WebP. Preserves transparency. No server. Processed locally in your browser. Free.

Convert PNG to ICO Online

Convert PNG to ICO with real binary headers. Transparencies preserved. No file uploads. Free and 100% private.

JPG to ICO Converter

Convert JPG photos to ICO with real Microsoft binary headers. Automatic square crop. No file uploads. Free and private.

Convert WebP to ICO

Convert WebP images to official ICO with transparency. No file uploads. Real Microsoft binary headers. Free and private.

Precision Cooking Tools and Calculators

13 tools

US Cooking Conversion Calculator: Cups to Grams

Convert cups, tablespoons, and Fahrenheit to the metric system. Your professional compass for decoding American recipes with absolute precision.

Professional Meringue Sugar Ratio Calculator

Calculate the exact amount of sugar for French, Italian, or Swiss meringue based on your egg whites' weight. Mastering stiff peaks with professional precision.

Banana Diagnostics and Conservation: Scientific Guide

Analyze your banana ripening stage with scientific precision. Learn conservation techniques, ethylene biochemistry, and nutritional optimization.

Precision Scientific Egg Timer and Altitude Calculator

Master the thermodynamics of the perfect egg. Calculate exact boiling times based on your altitude, egg size, and initial temperature.

Multiple Kitchen Timer

Manage multiple cooking times simultaneously. Independent alarms, ideal for chefs and kitchen organization (Mise en Place).

Neapolitan Pizza Dough Calculator

Calculate the exact proportions of flour, water, salt and yeast to prepare authentic Neapolitan pizza at home with professional results.

Equilibrium Brining and Fermentation Calculator

Master the science of equilibrium brining for juicy meats and perfect fermentations. Calculate exact salinity based on total product and water weight.

Cake Pan Size Converter and Baking Scaler

Scale any baking recipe to your pans instantly. Calculate the conversion factor for round, square, and rectangular molds with professional precision.

Professional Recipe Ingredient Scaler

Automatically scale your recipes based on serving count. Calculate exact ingredient amounts to multiply or reduce any recipe with professional precision.

Sourdough Starter Feeding Calculator

Automatically calculate exact proportions of starter, flour, and water for your sourdough maintenance and feeding. Preset or custom ratios available.

Professional Roux Ratio Calculator and Sauce Guide

Master the foundation of French mother sauces. Calculate exact roux proportions for Béchamel, Velouté, and Espagnole with professional accuracy.

Smart Cookware Selector: Kitchen Utensils Guide

Interactive guide to choose the best pan or pot based on your cooking style. Iron vs Stainless Steel vs Teflon. Find your perfect tool.

Yeast Converter: Fresh, Dry & Sourdough Starter

Convert between fresh yeast, dry yeast, and sourdough starter with precision. Get recipe adjustments when using sourdough starter to maintain perfect hydration.

Creativity and Leisure

Excuse Generator

Semantic gambling machine to get rid of commitments with style. Generate surreal and irrefutable excuses instantly.

Fortune Cookie

Check your daily destiny and discover your lucky numbers. One fortune per day, revealed with a click.

Glitch Image Distorter

Transform images into glitch art with RGB splits, scanlines, pixel sorting, and animated distortions. No Photoshop needed.

Synesthesia Painter

Visualize the color of words according to grapheme-color synesthesia. Each letter has its own color, turning text into chromatic art.

Zalgo Generator

Corrupt your messages with cascading overflowing Unicode characters. Adjust intensity and direction of the glitch effect.

Pattern Generator

Create pixel art and bead schemes for Miyuki or Hama from your photos. Color quantization algorithm, tunnel vision mode, and ZIP export.

Dice Roller

A complete dice simulator for your RPG and board games. Roll d4, d6, d8, d10, d12, d20 and d100 with modifiers and history.

Drone and Ham Radio Tools and Calculators

Drone Flight Time Calculator for LiPo LiIon Endurance Estimation

Calculate how long your drone can fly based on mAh capacity and current draw. Optimize your LiPo batteries for safe flights and maximum duration.

RF Antenna Length Calculator for FPV Dipoles and Whips

Calculate the exact measurement for your 868MHz, 2.4GHz, and 5.8GHz antennas. Improve your drone's range and avoid burning your transmitter with optimized SWR.

GPS Coordinates Converter from Decimal to DMS Online Free

Convert GPS coordinates from Decimal to Degrees, Minutes, and Seconds (DMS) instantly. Visual tool with map for drones, sailing, and geolocation.

Drone Power Analyzer: Thrust to Weight Ratio Calculator for FPV

Calculate the critical thrust-to-weight ratio for your FPV drone build. Get instant flight profile recommendations, visual power gauge, and optimize for cinematic, freestyle, or racing.

GSD Flight Planner: Ground Sample Distance Calculator

Calculate the Ground Sample Distance (GSD) for photogrammetry missions. Support for DJI, Autel, and custom cameras. Real-time flight planning with visual quality indicators.

Tools and Calculators for Students and Education

Weighted Grade & Final Score Calculator

Stop stressing over your GPA! Easily calculate your course grades and final marks. Just enter your assignments, exams, and their weights to see where you stand.

Citation Generator

Create automatic references in APA, MLA, and Vancouver formats with persistent storage.

Pomodoro Flow

Master your productivity with zen-focused time management. Customize work/break cycles, track interruptions, and visualize your focus patterns in real-time.

International Grade Converter & GPA Equivalence Calculator

The most precise tool for converting academic grades between international systems. Instantly translate scores from Spain, USA, UK, Germany, France, Italy, and more. Essential for Erasmus+, Fulbright, and global university applications.

Transcript GPA Parser & Calculator

Instantly calculate your cumulative GPA and weighted grade average by copy-pasting your raw university transcript text. Works completely offline.

Exam Countdown & Study Session Predictor

Calculate your exact daily study pace to reach your exam day fully prepared. Enter your material size, set rest days, and generate a customized study calendar.

LaTeX Formula Renderer

Render LaTeX math expressions instantly in your browser. Type any formula and copy the result as a PNG image, a Markdown code block, or raw LaTeX source — no server needed.

Viral Challenges & Games: Typing Test & Addictive Speed Challenges

1 tool

Typing Speed Test: Measure Your Writing Velocity

Fully offline typing test with addictive gamification. Measure your WPM, accuracy and achievements. Compete with yourself and improve your typing speed.

Sailing & Nautical

6 tools

Tide Height Calculator

Estimate water depth at any point in the tidal cycle using the nautical Rule of Twelfths. Ideal for coastal planning and nautical licence study.

Under Keel Clearance Calculator

Calculate the safe time window to cross bars, channels or draft-restricted points. Enter your boat draft, chart depth and tidal data to get the exact safe passage interval.

Nautical Units Converter

Convert nautical miles, knots, fathoms and atmospheric pressure. Includes interactive Beaufort scale for wind speed.

Sail Area and SA/D Ratio Calculator

Calculate the total sail area and sail area to displacement ratio of your boat. Nautical performance analysis based on I, J, P and E measurements.

Nautical Speed Converter and Beaufort Scale

Convert between knots, km/h, m/s and mph instantly. Includes full Beaufort table with sea state descriptions and wind effects.

Nautical Endurance Calculator

Calculate your maximum range and safe distance based on fuel consumption, tank capacity and cruise speed. Fuel management for motorboats.

Interactive Scientific Tools and Simulators

Colony Counter: Digital CFU Counting Tool for Petri Plates

Digital tool for counting bacterial colonies on Petri plates. Differentiate types, avoid errors, and calculate CFU with precision.

Asteroid Impact Simulator: Apocalypse Calculator

Simulate asteroid impacts with real physics. Calculate energy, crater, thermal radiation and shockwave. Would you survive Chicxulub?

Microwave Leak Detector: WiFi Interference Visualizer

Analyze if your microwave is leaking radiation by measuring real-time interference on your WiFi network. A scientific safety tool.

Simulation Probability Calculator: Do You Live in a Virtual Universe?

Analyze if our reality is a simulation using Nick Bostrom's trilemma argument. Calculate existential probability with 4 key parameters.

Cellular Renewal Calculator: How Much is Left of the Original "You"?

Calculate the percentage of your body that has renewed since birth. Estimates based on the cell division rate of organs, bones, and tissues. The Paradox of Theseus made tangible.

Tools and Calculators for Travelers and Adventurers

Carry on Luggage Calculator Airline Measurements 2026

Check the dimensions and weight allowed for your carry-on suitcase and personal item on Ryanair, Vueling, Iberia, and +30 airlines. Avoid surcharges!

International Tip Calculator

Calculate how much to tip on your trips. Includes percentage guide and etiquette rules for more than 50 countries. Don't mess up when paying!

Suitcase Checklist Generator Create your packing list

The ultimate online tool to organize your luggage based on trip type, destination, and duration. Never forget your travel essentials again.

Mini Adventure Forecast : Get Out of the Rut

Random daily challenge generator to break monotony and explore your surroundings.

Textile Tools

12 tools

Fabric Truthfulness: Textile Quality Analysis

Discover the real quality of your garments by analyzing their composition. Is it real cotton or expensive plastic? Scientific fiber analysis.

Textile Care Guide: How to Wash Every Fabric Type

Scientific guide to washing and caring for cotton, wool, silk, linen, and synthetics. Prevent shrinkage, fading, and damage with proper care instructions.

Stain Chemical Protocol for Textiles

Scientific protocols to remove stains based on fiber type and the chemical nature of the stain. Percarbonate, enzymes, solvents: the right method for every case.

Textile Burn Test

Identify the real composition of any fabric by analyzing its burning behavior. Scientifically differentiate cotton, wool, silk and synthetics.

Fiber Preparation for Natural Dyeing

WOF calculator, mordanting protocols and thermal ramps to prepare wool, silk and cotton before natural dyeing.

International Shoe Size Converter

Convert shoe sizes between US, European (EU), UK and centimetre (CM) systems. Size guide for men and women.

International Clothing Size Converter

Convert clothing sizes between EU, US, UK and IT systems. Shirts, pants, dresses and jackets for men, women and unisex. Includes measurement guide and brand fit recommendations.

Knitting Gauge Calculator

Easily recalculate stitches and rows for any knitting or crochet pattern. Adjust gauge by multiples and scale factor for a professional result.

Fabric Consumption Calculator by Garment

Easily calculate how much fabric you need to sew a skirt, trousers, a dress or a shirt. Adjust by fabric width and size for a professional cut.

Sewing Pattern Scaler Online

Adjust any sewing pattern to your real measurements. Differential scaling calculator with updated pattern preview.

Knitting and Crochet Needle Converter

Convert needle sizes between Metric (mm), US and UK systems with yarn weight recommendations and WPI.

Yarn Calculator: How many metres and balls do I need?

Accurately calculate the amount of yarn needed for your knitting and crochet projects based on pattern and size.

Home Calculators and Utilities

Offline QR Code Generator

Generate QR codes for WiFi, URLs and Contacts 100% securely in your browser. Your data never leaves your device.

Solar Panel Tilt Angle Calculator

Calculate the optimal tilt angle for your solar panels based on your geographic latitude. Get values for fixed installations and seasonal adjustments.

Projector Throw Distance Calculator

Calculate the exact distance to install your projector based on your desired screen size and Throw Ratio. Visual tool with real-time simulation.

Dew Point Calculator

Calculate the condensation temperature on your walls using ambient humidity and temperature. An essential tool for preventing dampness and protecting the structural health of your home.

LED Saving Calculator

Calculate how much money and kWh you save by switching your traditional bulbs to LED. Discover your exact annual and monthly savings plus CO2 reduction.

Electricity Tariff Comparator: Fixed vs Variable Price

Find out which electricity tariff suits you best. Compare the regulated market (PVPC) vs the free market based on your consumption and save hundreds of euros on your electricity bill.

Gas vs. Heat Pump vs. AC: Savings & Consumption Comparator

Calculate how much you save by switching your gas boiler for an air source heat pump or AC. Real consumption and efficiency comparison for your home.

File and Text Tools

9 tools

Clipboard to PNG: Download Screenshots and Images

Online tool to convert clipboard content (screenshots, images) into an instantly downloadable PNG file. 100% private and fast process.

Strip Text Formatting Online Free: Style Cleaner

Remove bold, italics, links, and colors from any text. Convert HTML or Word to plain text (txt) instantly with our professional style cleaner.

Online Character and Word Counter Letter Counting Tool

Online character, word, sentence, and paragraph counter. Calculate reading and speaking times. Free tool perfect for SEO and social media.

Online Hash Verifier: SHA 256, MD5 and SHA 1

Calculate and verify the integrity of your files by comparing their SHA256, MD5, or SHA1 digital signature. Ensure your downloads have not been altered.

Online Text to Markdown Converter: Format Documents

Transform plain text into Markdown code quickly. Convert paragraphs, headers and lists into format compatible with GitHub, Reddit and MD editors.

Free Online Emoji and Double Space Remover

Clean your texts instantly: remove WhatsApp emojis, normalize multiple spaces, and delete invisible characters for a professional and clean finish.

Online Text Splitter: Separate by Paragraphs, Sentences or Length

Split long texts into smaller parts automatically. Choose between separating by number of words, characters, paragraphs, or sentences.

JSON to CSV Converter Online Free: Export to Excel

Transform your JSON files into CSV tables quickly and easily. Ideal for data analysts who need to open JSON files in Excel or Google Sheets.

File Size Converter & Visualizer: Binary & Decimal

Convert between file size units instantly. See how long downloads take and visualize storage usage across devices. 100% local processing.

Social Media Tools

Social Safe Zones: Video Simulator for TikTok, Reels & Shorts

Preview your images and videos with the real social media interface. Ensure your content is always visible and avoid accidental cropping.

YouTube Thumbnail Extractor (HD)

Extract and download the original thumbnail image from any YouTube video at maximum resolution and without watermarks using just the URL.

Social Media Account Value Calculator: TikTok & Instagram Pricing

Find out how much to charge for sponsored posts. Our calculator analyses followers, engagement and niche to give you a fair market value.

Reddit Text Formatter: Cleaner and Markdown Fixer

Advanced text cleaner for posting on Reddit. Fixes missing line breaks, removes multiple spaces and hidden characters that break Markdown.

Social Media Image Resizer: Crop & Resize for Every Platform

Resize and crop your photos for Instagram, TikTok, YouTube and more. Smart cropping with updated official dimensions for 2026.

Tinder Photo Optimizer: Face Analysis and Composition

Optimize your Tinder photos with algorithmic face analysis. Simulates the 2026 interface, analyzes scientific framing and eye-line, exports perfect 9:16 portrait photos to maximize matches.

YouTube Thumbnail Previewer Online: Boost Your CTR for Free

Upload your thumbnail and see how it looks in the real YouTube feed on mobile and desktop. Dark and light mode simulator to optimize clicks instantly.

Online Music Tools

6 tools

Online Metronome: High Precision Visual and Audio

Free online metronome for musicians. Millisecond precision with Web Audio API. Visual, audio and Tap Tempo. Perfect for instrument practice.

BPM to Milliseconds Calculator for Delay and Reverb

Convert your project tempo (BPM) into exact delay times (ms) and frequencies (Hz). The essential tool for setting delays, reverbs and compressors with rhythmic precision.

Phase Distance Calculator for Microphones

Calculate the delay and compensation needed to align microphones. Avoid phase cancellation and comb filtering with sample-accurate precision and temperature adjustment.

Frequency to Musical Note Converter

Convert hertz to musical notes instantly. Identify the exact note of any frequency, measure the deviation in cents, hear the pure tone and tune synthesisers and samplers with precision.

Audio Storage Calculator: WAV, FLAC and MP3 File Size

Estimate the disk space needed for your audio recordings in WAV, FLAC and MP3 based on sample rate and bit depth.

Music Note Equivalency: Latin, Anglophone and German Systems

Interactive translator of musical notes between Latin (Do, Re, Mi), Anglo-Saxon (C, D, E) and Germanic (H) systems. Includes piano visualizer, octaves and frequencies (Hz).

Online Health Tools

16 tools

BMI Calculator: Body Mass Index Online

Calculate your Body Mass Index (BMI) for free. Online tool to assess your nutritional status based on your weight and height, with visual scale and WHO categories.

Color Blindness Simulator: Visualize Color Vision Deficiency

Simulate how people with color blindness perceive color. Visualize protanopia, deuteranopia, tritanopia and more with your own image or the included sample palette.

Tinnitus Relief: Online Notch Therapy Tool

Free online tool for tinnitus relief through Notch Therapy. Customizable white, pink and brown noise generator with a notch filter at your exact tinnitus frequency.

Conscious Breathing Visualizer: Box Breathing and Wim Hof Method

Instantly reduce stress and anxiety with our breathing visualizer. Bio-feedback guide for Box Breathing, 4-7-8 and Wim Hof Method.

Caffeine Metabolism Tracker: Sleep Simulator

Calculate how much caffeine remains in your system based on your metabolism. Decay visualizer to avoid insomnia and improve your rest.

Emergency Water Purifier

Bleach dosage calculator to purify emergency water. Survival tool based on WHO and CDC guidelines.

Digestion Stopwatch: Physiological Transit Tracker

Calculate how long your food takes to digest. Track progress through the stomach, small intestine, and large intestine based on macronutrients.

Binaural Wave Tuner for Lucid Dreams

Induce lucid dreams and deep relaxation states with delta, theta and alpha binaural beats. Frequency generator with visual stroboscope.

Pelli Robson Contrast Sensitivity Test

Measure your visual contrast sensitivity with the Pelli Robson test. Diagnose your ability to detect shades of grey, essential for night driving and eye health.

Peripheral Vision Trainer

Train your peripheral visual field with this agility game. Improve reading speed, situational awareness, and ocular reaction time.

Epworth Sleepiness Scale Test

Measure your daytime sleepiness with the Epworth Sleepiness Scale. A clinically validated test to detect possible sleep disorders.

Standard Drink Unit Calculator

Calculate the pure grams of alcohol and Standard Drink Units (SDU) of your cocktails, beer, wine and shots for safe and informed consumption.

Ocular Decompression Rest Calculator

Calculate how many minutes of visual rest you need based on your daily screen time. Personalised 20-20-20 rule to prevent digital eye strain and fatigue.

Blood Test Unit Converter

Medical calculator to convert blood test results between mg/dL and mmol/L. Compatible with glucose, total cholesterol, HDL, LDL, triglycerides, creatinine and urea.

Optimal Reading Distance Calculator

Find out how many centimetres from the screen you should sit based on your font size. Avoid eye strain and protect your vision with ergonomics.

Climate and Weight Hydration Calculator

Calculate exactly how much water you need to drink today. Algorithm adjusted for ambient temperature, relative humidity and physical activity level.

Sports & Performance Tools and Calculators

Sports Scoreboard Online: Free Score Counter

Digital scoreboard with giant buttons for mobile. Ideal for padel, ping-pong and football. No annoying ads in the middle of the game. Simple and fast.

Free Online Bracket Generator and Tournament Organizer

Organize tournaments and create single-elimination brackets for free with no registration. Perfect for FIFA, Padel, eSports and board games. 100% Mobile Friendly.

Gym Workout Tracker: Progress Charts and Strength Log

Log your lifts, select exercises, and visualize your progress with strength charts. Optimize your progressive overload in the gym.

Reaction Speed Test (Reflexes): Online Benchmark

Measure your reflexes in milliseconds with our professional reaction test. Compete for ranks from 'Turtle' to 'Cyberathlete' and analyze your performance.

Nature & Agriculture Tools

Cricket Thermometer – Dolbear's Law Temperature Calculator

No thermometer? Listen to the crickets. Calculate the exact temperature by counting chirps with our Dolbear's Law calculator.

Seed Spacing and Planter Calibration Calculator

Precision tool for farmers. Calculate the ideal spacing between seeds based on target population and row width, and analyse planter stress at different working speeds.

Rainwater Harvesting Calculator

Calculate how much rainwater you can collect from your roof and size your storage tank.

Digital Carbon Footprint Calculator

Analyze the environmental impact of any web page. Estimate energy consumption and CO₂ emissions per visit.

Web Development

24 tools

Free Online JSON Formatter and Validator

Free online tool to format, validate and repair JSON code. Beautify and format JSON. Detects syntax errors and improves code readability.

Free Online SVG to CSS and Data URI Converter

Transform your SVG icons and vectors into CSS code (Background or Mask) or compressed Data URI. Optimise your website performance by eliminating external HTTP requests.

Aspect Ratio Calculator in Pixels. Online Proportions

Calculate new image, video and web design resolutions and maintain the exact proportion to avoid distorting graphics. Supports 16:9, 4:3, 21:9 and custom formats.

Placeholder Image Generator. Rapid Web Mockups Online

Create custom placeholder images for your web designs. Adjust resolution, background, text and export in PNG, WebP or JPEG instantly.

URL Encoder and Decoder Online

Convert special characters from any link to safe format (Percent-Encoding) or return them to their original readable state instantly and locally.

Duplicate CSS Remover Online. Unify and Clean Stylesheets

Free tool to clean and purge duplicate CSS code. Unifies redundant selectors, respects the cascade, and reduces your file size instantly in the browser.

CSS to Inline HTML Converter. Inliner for Emails

Transform your stylesheets and CSS classes into automatically inlined styles in your HTML. Ideal for newsletters, transactional emails, and safe web layout.

CSS Specificity Calculator Online. Selector Weight Visualizer

Calculate the specificity and exact weight of any CSS selector. Visual tool to understand which CSS rule wins the cascade and avoid using !important.

Online Cron Expression Generator. Translator and Visualizer

Free visual tool to generate Linux Cron expressions. Translates * * * * * into human language and shows the next 5 executions in real time.

Online Keyboard Key Code Visualizer. KeyCode Inspector

Free online tool to see the event.key, event.code, event.which and location of any keyboard key in real time. Generates ready-to-use JavaScript code snippets.

LLM Cost Calculator. AI Model Pricing Estimator

Free online tool to estimate the cost of calling LLM APIs. Compare GPT-4o, Claude, Gemini, Llama and more with real token prices per million tokens.

Musical Typography Scale. Modular Scale Calculator

Free online tool to create harmonious visual hierarchies using modular scales based on musical proportions. Generates ready-to-use CSS variables for your web design.

Mobile Mockup Generator for App Store. iPhone and Google Pixel

Create professional presentations for the App Store and Google Play. iPhone and Pixel mockups with custom backgrounds, panoramic layouts, and bulk high-resolution export.

Online Security Hash Generator

Calculate MD5, SHA-1, SHA-256 and SHA-512 hashes instantly. Free, private and ultra-fast security tool for developers. 100% Client-Side.

Private AI Prompt Library

Organize, tag and save your ChatGPT, Midjourney and Claude prompts privately. Your own prompt bank in localStorage.

Online Color Converter RGB HEX and HSL

Convert colors between RGB, HEX and HSL instantly. Generate complementary color harmonies and analyze WCAG contrast. 100% client-side and private.

Visual Readability Calculator WCAG and APCA

Check the real contrast of your designs with APCA (WCAG 3.0). Analyze how font weight and size affect actual readability. From simple ratios to perceptual legibility.

Online SVG Sanitizer

Optimize and clean SVGs exported from Figma, Adobe Illustrator or Inkscape. Remove metadata, unnecessary attributes and empty groups to get a production-ready SVG.

UTM Parameter Generator for Google Analytics

Create precise tracking links for your digital marketing campaigns. Optimized for Google Analytics and other analytics tools.

URL Tracking Cleaner: Remove UTM, FBCLID and GCLID

Automatically remove tracking and advertising parameters from your URLs. Share clean links and protect your digital privacy instantly.

Online SSL/TLS Certificate Inspector View PEM and CRT Files

Analyze SSL certificate files (.pem, .crt, .der) locally. Check expiration dates, issuers, subjects and SHA-256 fingerprints without your data leaving your browser.

Security.txt Generator RFC 9116

Create your professional security.txt file to facilitate vulnerability reporting and comply with international web security standards.

Data Time Calculator Impact of Web Speed

Discover how much lifetime your users lose waiting for your website to load on 3G, 4G, and 5G connections. Calculate the real impact of your site weight.

Excel and CSV to HTML Table Converter Code Generator

Convert your Excel or CSV data to clean, semantic HTML tables instantly. Free tool for developers and content creators.

Hardware Testing & Diagnostic Tools

9 tools

Dead Pixel Test and Screen Repair Tool

Check if your monitor has dead or stuck pixels and repair them with our high-frequency strobe tool online.

Online Keyboard Test & Ghosting Detector

Check if your keyboard suffers from Ghosting or Key Jamming. Real-time key visualizer and N-Key Rollover counter.

Online Gamepad & Controller Test

Test your Xbox, PlayStation or PC controller. Visualize dead zones, joystick drift and buttons.

Online Gamepad Vibration Tester

Test the haptic motors and Dual-Rumble vibration of your gamepad in the browser. Supports Xbox, DualShock, DualSense and generic controllers.

Online Mouse Polling Rate Test

Check the real Hz of your mouse. Verify if your gaming mouse works at 1000Hz or more with our professional tool.

Lithium Battery Health Calculator

Calculate the State of Health (SoH) of your lithium battery based on cycles, voltage and temperature. Scientific guide to maximize energy longevity.

Online Tone and Frequency Generator

Generate sine, square, triangle and sawtooth waves. Test your speakers, headphones or subwoofer with frequencies from 20Hz to 20kHz.

Monitor Refresh Rate Detector

Instantly detect your monitor's refresh rate with precision using requestAnimationFrame. Test frame stability and compare with industry standards.

Color Accuracy Test: Spectrum Canvas

Calibrate your display with precision. Test sRGB and DCI-P3 color spaces, detect color shifts, measure accuracy with Delta E metrics, and generate professional calibration reports.

Tools and Calculators for Specialty Coffee Lovers

Coffee Brew Ratio Calculator

Calculate the exact grams of coffee or milliliters of water for your ideal ratio (1:15, 1:16...). Includes in-cup result, pour guide, iced coffee mode and saved recipes.

Coffee Brew Timer

Professional specialty coffee timer with pour phases, rhythm audio alerts and extraction summary. Optimized for V60, Chemex and Aeropress.

SCA Coffee Water Calculator

Calculate exact mineral concentrations for specialty coffee. SCA, Barista Hustle and Hendon profiles. Control Magnesium, Calcium and Bicarbonate to maximize flavor and protect your machine.

Coffee Grind Size Converter

Interactive grind size chart with clicks and levels guide for adjusting your grinder between Espresso, V60, French Press and more. Technical micron mapping for all extraction methods.

Coffee Extraction Diagnostics: The Brew Fixer

Diagnose why your coffee tastes bad in seconds. Get personalized adjustments for grind size, temperature, and time based on your brewing method and taste profile.

3D Printing Tools and Calculators

3D Printing Cost Calculator: Filament and Energy

Calculate the real price of your 3D prints. Includes material cost, electricity, machine amortization, and labor.

3D Shrinkage Calculator: Scale Factor and Shrinkage

Calculate how much you should scale your 3D designs based on the material (ABS, Nylon, ASA) to compensate for thermal shrinkage and get exact measurements.

Volumetric Flow: Understanding the Real Speed Limits of Your 3D Printer

Calculate the maximum volumetric flow rate of your 3D printer. Understand the real hardware limitations of your hotend.

UV Resin Curing Time Calculator

Determine the exact curing time for your resin 3D prints. Based on lamp power in watts, resin type, and distance. Professional technical guide.

Streaming and Content Creator Tools

2 tools

Random Name Picker for Streaming

Choose a winner at random from a list of names. Free, fast, and visual giveaway tool for Twitch, YouTube, and events.

ISP Blockage Detector Tebas Check

Diagnostic tool to detect illegitimate blocking of shared Cloudflare IPs by Spanish ISPs.

Precision Financial Tools & Calculators

14 tools

Compound Interest Calculator: Visualize Your Future Wealth

Discover how small investments become large fortunes. The definitive tool for planning your financial freedom and retirement.

Financial Freedom & Survival Runway Calculator

Calculate exactly how long your savings will last. Our survival runway tool helps you visualize your financial independence and plan your exit strategy or emergency fund.

Investment Profitability Calculator: ROI & CAGR

Analyze your investment performance with precision. Calculate total Return on Investment (ROI) and Compound Annual Growth Rate (CAGR) to understand your true annualized gains.

Mortgage Calculator: Full Amortization Table and Payoff Strategy

Calculate your monthly mortgage payment, discover total interest costs, and visualize your complete French amortization schedule instantly.

Inflation Calculator Spain: Historical Money Value

Discover what your pesetas are worth today or how much cost of living has increased since 1980. Updated Spanish CPI historical data through 2026.

Percentage Calculator: 4 in 1 for Discounts, Tax and Markups

Calculate percentages online for free. 4 tools in 1 to find X% of Y, percentage difference, add or subtract VAT, discounts and tip calculations automatically.

Late Interest Calculator: Calculate Penalty Interest

Calculate late payment interest and penalty charges. Tools for simple, compound, and monthly interest calculations. Perfect for overdue invoices and debt calculations.

IBAN to BIC SWIFT Converter and Bank Code Finder

Get the BIC/SWIFT code from any Spanish IBAN instantly. Bank account validator with official algorithm and updated records for international transfers.

Spain Rent Increase Calculator IPC 2026 with 3% Legal Cap

Calculate your rent increase based on IPC or the legal 3% limit from Spain's Housing Law. Free tool for Spanish tenants and landlords.

Spain Lottery Optimizer and Probability Calculator

Analyze your odds in Spain's Christmas Lottery, Euromillones, and Bonoloto. Calculate the optimal number of tickets and expected value of your bet.

Spanish Court Fees Calculator

Calculate exact judicial fees for Spanish companies under Law 10/2012. Automatic Form 696 calculator with exemptions and calculations.

Spain Legal Interest Rate 2026

Calculate the legal interest rate applicable in Spain for 2026. Automatic calculator with 3.25% rate according to the budget law. Includes delay interest and mora calculations.

FIRE Calculator: 4% Rule

Calculate your financial independence number using the 4% rule. Plan your early retirement and visualize your path to financial freedom.

Debt Snowball Calculator: Debt Payment Plan 2026

Calculate your financial freedom date using the debt snowball method by Dave Ramsey. Organize your debts from smallest to largest and visualize your monthly payment plan for free.

Statistics and Probability Tools