DevKit Offline — 12 Developer Tools in One HTML File (works forever, no internet)

Every JSON formatter, password generator or IBAN checker on the web has the same problem: you're pasting confidential data into someone else's server. DevKit Offline is one HTML file (~33 KB) that runs everything locally: • JSON: pretty-print, minify, validate • JSON ⇄ CSV converter • Password generator (CSPRNG) + passphrase generator + entropy meter • Portuguese NIF, EU VAT and IBAN checksum validators • URL cleaner — strips utm_*, gclid, fbclid and 30+ other tracking params • Slug generator, UUID v4, SHA-256 hash • WCAG color-contrast checker (AA/AAA) Zero network requests. Zero analytics. Zero accounts. Open the file, read the source — it's all there. Works on any modern browser, any OS, forever. Free updates via Gumroad. Who it's for: developers, freelancers, and finance/admin staff handling tax IDs and IBANs who shouldn't be pasting them into random websites.

Found on Devadex — the discovery index for independent software the big search engines bury. More from gumroad.

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