DevKit - Developer Utilities

30+ developer tools in one app — JSON, Base64, JWT, hashes & more. 100% offline, privacy-first. No data ever leaves your device.

DevKit: Essential Developer Tools, 100% Offline

Stop juggling browser tabs. DevKit puts 30 powerful development utilities in your pocket—all working completely offline with privacy-first design.

PRIVACY-FIRST DESIGN

100% Offline: Every tool works without internet. Your data never leaves your device. Local Storage Only: All processing happens on your device. No servers, no tracking. No Personal Data Collection: We don't collect, store, or transmit any of your work.

30 ESSENTIAL TOOLS

FORMATTERS

JSON Formatter: Beautify or minify JSON with error highlighting and tree view HTML Formatter: Beautify, minify, and preview HTML with live rendering CSS Formatter: Format and validate CSS with syntax highlighting JS Formatter: Format and minify JavaScript XML Formatter: Format and validate XML documents SQL Formatter: Format and validate SQL queries

PARSERS & DEBUGGERS

JWT Debugger: Decode tokens, inspect headers and payloads, verify signatures Cron Parser: Parse cron expressions with next run calculations Certificate Decoder: Decode X.509 certificates

ENCODERS & DECODERS

Base64: Encode and decode Base64 strings URL Encoder: Encode, decode, and parse URLs HTML Encoder: Handle HTML entities Hash Generator: Generate MD5, SHA-1, SHA-256, SHA-512 hashes Backslash Escape: Escape and unescape special characters

CONVERTERS

Timestamp: Convert Unix timestamps to readable dates Case Converter: Transform between camelCase, snake_case, UPPER CASE, and more Color Converter: Convert between HEX, RGB, HSL with live preview YAML ↔ JSON: Convert between YAML and JSON with tree view Number Base: Convert between Binary, Octal, Decimal, Hexadecimal Hex ↔ Text: Convert between hex and ASCII CSV ↔ JSON: Convert between CSV and JSON

GENERATORS

UUID/ULID Generator: Create UUIDs and ULIDs instantly QR Code: Generate customizable QR codes and export as images Lorem Ipsum: Generate placeholder text Random String: Generate secure passwords and API keys

PRO-TIER UTILITIES

Diff Checker: Compare text with highlighted differences RegEx Tester: Test regex with live match highlighting Markdown Previewer: Preview Markdown with GitHub Flavored support Line Sort: Sort and deduplicate lines String Inspector: Analyze string statistics

BUILT FOR MOBILE

Smart History: Auto-saves recent work (10 items free, unlimited with Pro) Instant Paste: Smart clipboard detection Quick Actions: One-tap copy, clear, share Native Performance: Blazing fast, no loading screens Light & Dark Modes: Beautiful design for any environment Organized by Category: Easy browsing and discovery

FLEXIBLE PRICING Pro: $9.99/month or $39.99/year (save 67%) 3-Day Free Trial | Cancel anytime

PERFECT FOR:

Mobile developers debugging on the go DevOps engineers managing infrastructure Web developers formatting data QA testers generating test data Anyone needing dev tools without internet

WHY DEVKIT?

100% offline—no Wi-Fi required Privacy-focused—data stays on device Fast & reliable native performance Regular updates with new tools No ads, ever Built by developers, for developers

Download DevKit and take your essential tools anywhere.

Terms of Use: Apple's Standard EULA (https://www.apple.com/legal/internet-services/itunes/dev/stdeula/)