DevToolkit Mobile

Essential developer tools in one app. Decode JWTs, generate UUIDs, calculate hashes, compare text, parse cron expressions, convert timestamps, and more.

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.