Dev Toolkit — 440+ Developer Tools — yurukusa

Dev Toolkit gives you instant access to 440+ free browser-based developer tools, right from your browser toolbar.

FEATURES:
- 440+ tools across 8 categories: Code, Design, Writing, Data, AI, Media, DevOps, Security
- Instant search — find any tool in milliseconds
- Favorites — star your most-used tools for quick access
- Recent tools — automatically tracks what you've used
- Category filters — browse by type
- Zero data collection — only uses storage for your favorites
- No tracking, no ads, no network requests

POPULAR TOOLS INCLUDED:
- JSON Format, JSON Diff, JSON Schema
- Regex Tester, Base64 Encoder, URL Encoder
- Color Palette, Color Contrast Checker
- CSS Grid, Flexbox, Animation generators
- Image Resize, SVG Optimizer, QR Code
- API Tester, HTTP Status Reference
- Markdown Editor, Word Counter
- And 400+ more...

Every tool is a single HTML file that runs entirely in your browser. No server, no signup, no data leaves your machine.

Open source: https://github.com/yurukusa/dev-toolkit