Browse Apps

Test your typing speed and accuracy with two modes: Time Attack (15s/30s/60s against the clock) and Passage Mode (easy/medium/hard complete texts). Features live WPM tracking, per-mode leaderboards, and cloud-synced personal bests.

Test your typing speed with real-time analytics, multiple difficulty modes, and category-based texts. Track WPM, accuracy, and streaks in a slick hacker-style interface.

Test regular expressions with live highlighting. See matches, groups, and flags in real-time.

A page displaying every standard HTML5 element. Great for testing CSS themes, browser rendering, and learning HTML5 tags.

Configurable multiple-choice quiz engine with scoring and feedback.

Gamified vision screening tool with interactive Snellen, astigmatism, and color blindness tests, featuring progress tracking and educational content.

Professional color picker with WCAG contrast checking and multiple color spaces.

Drag-and-drop digital logic circuit simulator. Build circuits with AND, OR, NOT, flip-flops, LEDs, and more.

Test your reflexes! Click the green box as fast as you can. Tracks your average and best times.

A beautiful, lightweight dialog and modal library demo. See alerts, confirms, prompts, and custom dialogs with smooth animations.

Build and simulate digital logic circuits with AND, OR, NOT, XOR gates, LEDs, and clock signals.

Turn JavaScript code into draggable bookmarklets instantly. Paste your code, get a ready-to-use bookmarklet link you can drag to your browser toolbar.

Compress JSON into ultra-short URL-friendly strings. Paste JSON, get a crushed version you can share in URLs or query params.

Build and simulate electronic circuits with drag-and-drop components including logic gates, LEDs, switches, and more.

Test your gamepad or controller in the browser. See real-time button presses, joystick movements, and axis values for any connected controller.

Test your knowledge of JavaScript's tricky == operator. Fill in the equality table by guessing which comparisons return true — a fun challenge for developers.

An interactive JavaScript console. Type JavaScript, see results instantly. Perfect for experimenting and learning.

Watch, remember, repeat. A neon Simon-style memory test with an ever-growing pattern. Daily challenge enabled — everyone sees the same sequence.

Test your knowledge across dozens of categories in this fast-paced trivia game. Choose your category and difficulty, answer 10 questions against the clock, build streaks for score multipliers, and chase your high score.

An interactive foreign language vocabulary learning tool that uses a proven study scheme to help you efficiently memorize words and build your terminology.

Draw a pattern to unlock, just like on your phone. A smooth, canvas-based pattern lock you can try in your browser.

Paste HTML and get clean Markdown output instantly. A live converter for turning web content into readable, portable Markdown text.

An open-source puzzle game editor and engine. Design, build, and play tile-based puzzle games right in the browser.

Generate custom QR codes with logos, colors, and UTM tracking. Create branded QR codes for links, WiFi, contacts, and more.

Visualize geographic shapes on an interactive OpenStreetMap. Paste WKT geometry strings and see polygons, lines, and points plotted instantly on the map.

Practice recognizing the four tones of Mandarin Chinese. Listen to audio samples and test your ear — great for beginners learning tonal pronunciation.

An elegant browser-based command-line console. Type commands, see output, and build interactive terminal-style experiences in the browser.

JavaScript API client library for Passky password management services. Provides developers with tools to integrate password management functionality into web applications.

Write HTML, CSS, and JavaScript with instant live preview. A lightweight CodePen-style editor in your browser.

Define states, symbols, and transitions, then watch a Turing machine execute step by step.

A memory card matching game featuring characters from JoJo's Bizarre Adventure. Flip cards, find pairs, and test your memory.

Unscramble letters to form words across different themed levels like fruits, animals, and colors. Perfect for ESL learners and word puzzle enthusiasts.

A visual node-based environment for designing digital signal processing chains. Connect oscillators, filters, and effects using Web Audio.

A polished trivia quiz with multiple categories, difficulty levels, and score tracking. Test your knowledge across thousands of questions.

A comprehensive alarm clock and productivity app with timezone support, Pomodoro timer, customizable sounds, and smart scheduling features.

Defend 13 space bases using precise mouse movements to draw defensive lines against enemy attacks. Collect coins and powerups to upgrade your defenses.

A programming puzzle game. Write JavaScript to control a building elevators and transport passengers as efficiently as possible.

Hit the falling notes in time with the beat. Test your reflexes and rhythm in this music-powered arcade game.