Developer tools, built by developers
Free, open-source browser tools for frontend developers — Tailwind cheat sheet, CSS Grid & Flexbox builders, color converter, regex tester, and more.
ToolFox is a growing collection of browser-based developer tools for frontend engineers, UI designers, and anyone who works with CSS daily. Every tool runs entirely in your browser — no accounts, no install required. Tailwind CSS cheat sheet with 1,200+ utility classes, CSS Grid & Flexbox visual builders, color converter, regex tester, and more on the way.
Tailwind CSS Cheat Sheet — Our Most Popular ToolTools
Pick a tool and get to work. More coming soon.
Tailwind CSS Cheat Sheet
Every utility class, every version. Searchable & copyable.
CSS Grid Generator
Visual CSS Grid builder with code export.
Flexbox Playground
Interactive flexbox property explorer.
Color Converter
Convert between HEX, RGB, HSL, and OKLCH.
Regex Tester
Test and debug regular expressions in real time.
JSON Formatter
Format, validate, and minify JSON with syntax highlighting.