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Developer builds 59 free browser-based dev tools in vanilla JavaScript

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A developer has released Antigravity Tools, a collection of 59 free utilities that run entirely in the browser. The project was built with no dependencies, no server, and no telemetry, so user data never leaves the device. Tools rely on native browser APIs such as Web Crypto, Canvas, Web Audio, and IndexedDB rather than Node.js or npm packages. The collection covers areas including JWT decoding, key generation, encoding, JSON and regex work, cron and Git helpers, and AI-related utilities like token counting and prompt trimming. The creator shared the project and lessons learned on DEV Community.

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