Was debugging a JWT token last month. Opened one of those popular online decoders, pasted my token — then checked the Network tab. POST request. My entire token (which included a staging database URL) was being sent to their server.
I looked for a client-side alternative and couldn't find one that had all the tools I needed. So I spent the last couple months building ApexApps.in.
It's 10 free dev tools that run entirely in your browser:
- JSON Formatter (format / validate / minify)
- JWT Decoder — completely offline
- CSS Minifier
- SQL Formatter
- Base64 Encoder/Decoder
- Regex Tester with live match highlighting
- Cron Builder (visual + plain English explanation)
- Color Tools (HEX/RGB/HSL + WCAG contrast checker)
- Timestamp Converter
- HTML Formatter with live preview
You can verify the privacy claim yourself: DevTools → Network tab → use any tool → zero POST requests.
Everything runs through the local V8 engine so it's also faster than server-based tools for large files.
Happy to answer questions about the architecture or what I'm planning to add next. What tools do you find yourself using daily that should be on the list?
Top comments (0)