Browse Apps

Interactive visualizations of 40+ data structures and algorithms — trees, heaps, graphs, hash tables, sorting, and more. A classic CS education resource.

A lightweight web spreadsheet with formulas, cell formatting, merge, freeze panes, and multiple sheets. Excel-like editing in the browser.

Convert tables between CSV, Markdown, SQL, and HTML formats instantly. Paste data in any format, edit it in a spreadsheet-like form, and export to the format you need.

Compute mean, median, mode, standard deviation, and more from a data set.

An idle clicker that teaches the history of particle physics. Build accelerators, discover particles, and fund CERN.

Edit, format, validate, and explore JSON with tree and code views.

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

A powerful note-taking app with rich text editing, task management, and GitHub sync capabilities. Your data stays in your control with offline access and local storage.

A live-coding music sequencer where every letter of the alphabet is an operator. Route signals through a 2D grid to generate sound.

Track your menstrual cycle with this privacy-first period tracker. Log dates, predict upcoming periods, and view cycle patterns -- all data stays on your device.

A powerful QR code toolkit — analyze, decode, and recover damaged QR codes step by step. See the internal structure, edit modules, and extract data from partial codes.

The Cyber Swiss Army Knife: encoding, hashing, encryption, compression, and hundreds more operations.

Visualize JSON as an expandable tree structure.

Interactive visualization of how convolutional neural networks work. Explore layers, filters, and activations on real images.

Track income, expenses, and budgets in a clean interactive dashboard. Set spending categories, view charts, and get insights into your financial habits — all stored locally.

Live status dashboard for the Strait of Hormuz. See current shipping conditions, threat level, oil flow data, and the latest news headlines.

Plan custom workouts organized by days and exercise blocks with built-in timers, dark/light themes, and local data persistence with JSON export/import.

Convert Excel spreadsheets to Markdown right in your browser. Drop an .xlsx file and get clean tables, text, and images as Markdown — all processed locally, nothing uploaded.

Precision stopwatch with lap tracking and millisecond accuracy. Clean, distraction-free interface.

Drop GeoJSON, KML, or GPX files onto an interactive map to visualize geographic data instantly. Everything runs locally.

Get current weather conditions and forecasts by searching for any city or using your current location.

Personal budget dashboard with interactive charts, income and expense tracking, and real-time balance calculations.

Encode and decode Base64 text instantly in the browser.

A mesmerizing wind particle visualization on a world map, powered by WebGL. Watch millions of particles flow with real wind data.

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

Track time spent on tasks with a simple start/stop interface and local storage.

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

Watch sorting algorithms in action. Compare bubble, merge, quick sort and more side by side.

Turn-based roguelike dungeon crawler powered by real D&D monster and spell data. Fight 334 SRD creatures, draft from 319 spells, and compete on the leaderboard.

Explore all 118 elements with a beautiful glassmorphism periodic table. Search, filter, and learn about each element.

Find the most profitable trades between two merchants. Add buy and sell prices for goods at different locations, and instantly see which trades yield the best profit margins.

A fun sentence mixing tool — type or paste text, rearrange phonemes, and create hilarious audio mashups right in your browser.

Offline learning platform for creating and studying interactive capsules with notes, flashcards, and quizzes. All data stays in your browser.

Create professional invoices with line items, tax calculation, and notes. Print or save as PDF directly from the browser.

Paste raw JSON and get clean, formatted output instantly.

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

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

A simple, responsive drawing pad that works on desktop and mobile. Pick colors, adjust brush size, undo strokes, and sketch freely on an HTML5 canvas.

Track your running and fitness activities. Log workouts, set goals, and watch your progress over time with charts and stats.