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.