Developer tools, curated

Compare two blocks of text side-by-side with highlighted differences. Your text never leaves the browser.

by Jason Tally

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

by caiorss

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

by stonehank

A visual editor for creating and manipulating SVG paths. Click to add points, drag to adjust curves, and export clean SVG code.

by Yqnn

A browser-based life simulation game where you play as a developer. Make career choices, manage your skills, and try to succeed in the tech industry.

by naoxink

Convert between binary, decimal, octal, and hexadecimal number systems.

by Launch Arcade

Generate harmonious color schemes using the OKLCH color model with CSS variable output.

by SteffenHebestreit

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

by 1j01

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

by Launch Arcade

Pretty-print SQL queries with support for MySQL, PostgreSQL, and many other dialects.

by sql-formatter-org

A tiny, elegant code editor for the browser with syntax highlighting. Write and edit code in a clean, minimal interface.

by kazzkiq

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

by slikts

Visualize JSON as an expandable tree structure.

by Launch Arcade

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

by Launch Arcade

Paste raw JSON and get clean, formatted output instantly.

by Launch Arcade

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

by GCHQ

Encode and decode Base64 text instantly in the browser.

by progers