Tools for Students
85 toolsTools to boost your study sessions. Transcribe lectures, format text, train your brain with puzzles, generate focus sounds, and practice typing — all free.
Reaction Time Test
Measure your reaction speed in visual, audio, and reflex modes with millisecond precision.
Typing Speed Test
Measure your typing speed in words per minute with real-time accuracy tracking
Typing Trainer
tools/typing-trainer.hint
Earth Meter
Watch 20 world statistics update live: population, environment, energy, technology, economy.
Circuit Simulator
Build and simulate electronic circuits in your browser. Drag-and-drop components, draw wires, real-time voltage and current readouts.
Audio to Notes
Transcribe any audio recording into notes, MIDI, and sheet music using AI.
Sheet Music to MIDI
Scan any score photo or PDF and hear the notes back.
Music Genre Detector
Upload an audio file to identify its genre, mood, dominant instruments, BPM and musical key.
Random Number Generator
Generate random numbers, roll dice, flip coins, pick from lists, create passwords. Crypto-secure, instant, free.
Spectrogram Lab
Analyze sonograms and spectrograms of wildlife sounds: birds, bats, whales, frogs, insects.
Cell Counter
Automatic cell counting and microscopy image analysis — free, in your browser.
Number to Words
Spell numbers and amounts with real grammar — seven languages, currency, ordinals, cheques and batch mode.
Sign PDF
tools/sign-pdf.hint
Keyboard Layout Converter
Convert between 12 keyboard layouts with auto-detection — QWERTY, Cyrillic, Korean, Arabic and more.
Military Time Converter
Convert between 24-hour military time and 12-hour AM/PM format with live sync, batch mode and reference chart.
Countdown to Date
Live countdown timer to any date with themes, full-screen and shareable link
Percentage Calculator
Percent of a number, percent change, discount, tip, VAT, markup
GPA Calculator
Add each course with its letter grade and credit hours to get your credit-weighted GPA.
Online Protractor
Free online protractor with transparent overlay and photo measurement — calibration, multi-angle, PNG/PDF/JSON export.
Barcode Scanner
Scan any barcode or QR code from camera or uploaded image. Get product info, links, and more.
Online Stopwatch
Precise online stopwatch with laps, splits, sparkline and shareable link
Slideshow Maker
Drop multiple photos, add an audio track, pick a transition — get a finished video, slide deck or PDF in one click.
File Transfer
Drop a file or folder, share the 6-letter code or QR — the transfer flows directly between browsers.
Distance Between Cities
Measure the straight-line distance between two cities, with bearing, midpoint, flight time and a map.
