# DevToolkit Mobile — Hash JWT JSON Cron & More

> Hash JWT JSON Cron & More (iPhone/iPad app by Dion Yang.)

- Source: https://appshunter.io/ios/app/devtoolkit-mobile/id6787450948 (this page in markdown: same URL + `.md`)
- Developer: [Dion Yang](https://appshunter.io/developer/6787450950)
- Category: Developer Tools, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Released: 2026-07-31
- Data updated: 2026-10-10

## What is DevToolkit Mobile?

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.

## Is DevToolkit Mobile safe?

Not enough ratings yet to assess DevToolkit Mobile.

## Is DevToolkit Mobile legit?

DevToolkit Mobile has limited verification signals. The AppsHunter Legitimacy Score for DevToolkit Mobile is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1 — 2026-08-27

Updated Marketing URL

### 1.0 — 2026-07-31

No release notes.

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## More apps by Dion Yang

- [My Hypertrophy](https://appshunter.io/ios/app/my-hypertrophy/id6794372316)

All apps by Dion Yang: https://appshunter.io/developer/6787450950

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-10.*