Developer Kit

DeveloperKit is a fast, native macOS toolbox with 50+ everyday developer utilities in one place — no browser tabs, no ads, no data leaving your Mac.

Data & Encoding
JSON Formatter, Base64, JWT Decoder, Hash Generator (MD5/SHA1/SHA256/SHA512), HMAC Generator, CSV ⇄ JSON, XML Formatter, JSON → TypeScript, JSON → Swift, Data URI Converter, SQL Formatter

Text
Regex Tester, Text Diff, Markdown Preview, Text Case & Lorem Ipsum, URL Encoder, String Escape, Line Tools, Whitespace Visualizer, ASCII Art Banner Generator

Network
HTTP Client, Mock Server, Subnet Calculator, HTTP Status Codes, URL Parser, User-Agent Parser, APNs Payload Builder, cURL → Swift, MIME Type Lookup

Design
Color Tool, QR Code Generator, CSS Gradient, Contrast Checker, Box Shadow, Cubic Bézier Curves, Color → Swift, SF Symbols Browser, App Icon Generator, SVG Path Visualizer

Utility
UUID/ULID Generator, Timestamp Converter, Cron Parser, Base Converter, Password Generator, Permissions Calculator, Unit Converter, ASCII Table, Device Specs, Provisioning Profile Decoder, .gitignore Generator, Semver Comparator, Git Branch Name Builder, Epoch Batch Converter

Everything runs locally and instantly — built for engineers who want their tools fast, native, and offline.