Cog - Dev Toolbox

Cog is a fast, offline toolbox for developers — a whole shelf of the little utilities you reach for every day, in one clean app. No account. No network. No tracking. Everything runs on your device. Stop pasting sensitive tokens and payloads into random websites. Cog does it all locally. FREE TOOLS • JSON — pretty-print, minify, sort keys • Base64 — encode & decode • URL encode / decode • HTML entities — escape & unescape • JWT decode — inspect header & claims (decode only) • Hash — MD5, SHA-1, SHA-256, SHA-512 • UUID — generate v4 • Epoch time — convert Unix timestamps ↔ dates • Case convert — camelCase, snake_case, kebab, PascalCase, CONSTANT • Slugify — clean URL-safe slugs • Color — HEX ↔ RGB ↔ HSL with a live swatch • URL parse — break a URL into its components COG PRO (one-time purchase — yours forever) • Regex tester — live match highlighting & capture groups • Diff — line-by-line…