DevToolkit Mobile

The Swiss Army knife for developers. Parse crons, decode JWTs, hash strings, format JSON & SQL — all offline, no login required. Try 5 tools free.

Dev Toolkit packs the everyday developer utilities you reach for dozens of times a week into one fast, native iOS app — no browser tabs, no terminal, no Wi-Fi required.

Whether you're debugging an API token, checking a cron schedule, or converting timestamps on the go, Dev Toolkit gives you instant answers with copyable output you can paste anywhere.

FREE TOOLS

• Cron Parser — Paste any cron expression and see the next 5 scheduled runs in plain English. Supports standard 5-field and extended @yearly/@monthly shortcuts.

• JWT Decoder — Drop in a JSON Web Token and instantly inspect the header, payload, and signature. Expired tokens are flagged automatically.

• Encoder / Decoder — Base64, URL-encode, and HTML-encode or decode any string in one tap.

• Hash Calculator — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any input. Great for checksums and quick verification.

• Timestamp Converter — Convert Unix epochs to human-readable dates and back. Handles seconds and milliseconds, with live "ago" formatting.

PRO TOOLS

Unlock all five Pro tools with a one-time purchase — no subscriptions, no recurring charges.

• UUID Generator — Generate RFC 4122 v4 UUIDs in bulk. Copy one or copy all at once.

• JSON Formatter — Pretty-print, minify, and validate JSON. Highlights syntax errors with line numbers.

• Chmod Calculator — Translate between octal (755) and symbolic (rwxr-xr-x) Unix file permissions interactively.

• SQL Formatter — Clean up messy SQL queries with proper indentation and keyword capitalization.

• Diff Checker — Compare two blocks of text side-by-side or as a unified diff. Spot changes instantly.

WHY DEV TOOLKIT

• Native iOS 17+ — Built entirely in SwiftUI. No wrappers, no web views. Feels right at home on iPhone and iPad. • Adaptive layout — NavigationStack on iPhone, NavigationSplitView on iPad for a true split-pane experience. • Offline-first — Every tool works without an internet connection. Your data never leaves your device. • Dark mode — Full dark and light appearance support. • One-tap copy — Every output view has a copy button. Generate, copy, paste. Done. • No accounts — No sign-up, no cloud sync, no tracking. Open the app and get to work. • Private — Zero analytics beyond what Apple provides. No data collection.

BUILT FOR DEVELOPERS, BY A DEVELOPER

Dev Toolkit Mobile focuses on the utilities that are annoying to do in a browser and overkill to open a terminal for. It's the app you keep in your dock for the quick stuff.

Free forever: Cron Parser, JWT Decoder, Encoder/Decoder, Hash Calculator, Timestamp Converter. Pro (one-time): UUID Generator, JSON Formatter, Chmod Calculator, SQL Formatter, Diff Checker.