KitBoxDev

The pitch

KitBoxDev is a free collection of over 35 browser-based utility tools for developers, DevOps engineers and electrical engineers. Tools include QR code generation, JWT debugging, hash generation, cron parsing, CIDR calculation, Ohm's law and resistor code lookups, all running entirely client-side with no sign-up required. Nothing typed or uploaded ever leaves the browser, and the site works offline once loaded.

Fully client-side execution using the browser's native Web Crypto API means sensitive data (like production JWTs or secrets) never touches a server, unlike many similar utility sites; it also uniquely spans developer, DevOps, and electrical engineering toolsets in one searchable catalog with a command palette.

Weekly appearances · 2

• 2026-W39Relaunched
• 2026-W38Manual launch

Scorecard · 1 review

• Max Liao9/10

  Thirty-five client-side utilities with no sign-up, nothing leaving the browser and offline support after first load is an unusually clean answer for tools people reach for once a week and do not want to hand data to. The mixed developer and electrical-engineering set is odd but harmless. I would not pay for it and there is no visible monetisation, which normally kills a project. Here it probably does not: a static client-side site costs almost nothing to keep alive, so survival is cheap.