I Built 75+ Free Developer Tools — Here's What I Learned

Hey everyone! I'm jinyuan, an indie developer. I recently launched DevTools Box — a free online toolbox with 75+ developer tools. What's in the box? DevTools Box includes tools like: JSON Formatter — beautify and validate JSON Regex Tester — test regular expressions with live matching Base64 Encoder/Decoder — quick encoding and decoding QR Code Generator — generate QR codes instantly Hash Calculator — MD5, SHA-1, SHA-256 and more Color Picker — pick colors and convert between formats ...and 69 more tools! Why I built it I was tired of jumping between different websites for simple dev tasks. Each tool runs entirely in your browser — no login, no ads, no data sent to any server. Tech stack Next.js 14 with App Router TypeScript Tailwind CSS Static export to Cloudflare Pages Try it out Check it out at tdboxs.com . All tools are 100% free. Would love to hear your feedback! What tools would you add?