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

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A developer has created 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 machine. Tools rely on native browser APIs such as Web Crypto, Canvas, Web Audio, and IndexedDB rather than external libraries. The offerings include JWT decoding, key generation, PII masking, encoding and decoding, AI token cost estimation, JSON and cURL conversion, regex testing, and cron building. The author shares the project and the lessons learned along the way through a DEV Community post.

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