DevToolBox – 93 Free Online Developer Tools (JSON, Regex, JWT, Base64)
Site returns 502 error on launch day, and the tools are already in browser DevTools.

Yet another CyberChef clone with 121 tools, but nothing you can't already do elsewhere.
Web developers needing quick utilities without installing software
CyberChef · Browserling · FreeFormatter
Site returns 502 error on launch day, and the tools are already in browser DevTools.
Bundles a predictable but genuinely handy set of small tools — URL shortener with analytics, QR (PNG/SVG/data URL), fake-data generator and JWT/regex helpers — behind a no-auth REST API and a zero-dependency npm package. The on-chain 1 USDC unlimited-key option is a smart monetization experiment, but this space is crowded: reliability, clear rate limits and docs will determine whether it becomes a daily go-to or just another utilities site.
Everything important runs in the browser: JSON formatters, a JWT debugger explicitly marked 100% client-side, and a new Database Design Studio that turns SQL/Prisma schemas into draggable ER diagrams you can export as PNG. The product’s hook is convenience plus privacy — a single place to grab many small tools without sending snippets to a server. It’s useful and nicely designed, but the core idea is a well-curated bundle rather than a novel technical breakthrough.
Every tool here exists in browser DevTools or CyberChef with more features.
117 utilities, 530 auto-generated SEO pages, and an explicit monetization plan (2,561 ad slots) make this a pragmatic productized repo for someone who wants fast ROI or a learning-grade production app. The author clearly prioritized SEO and privacy (several client-only tools like JWT decoders), and shipping it as a saleable bundle is honest — but the concept itself is crowded, so its appeal is mostly to people who want turnkey code or examples, not novelty.
CyberChef clone with better privacy and MCP tools—but CyberChef already dominates.