Developer builds 59 free browser-based dev tools in vanilla JS with no server or tracking

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A developer has created Antigravity Tools, a collection of 59 free utilities for programmers that run entirely in the browser. The project was built with no dependencies, no backend server, and no telemetry, so user data never leaves the device. Its tools rely only on native browser APIs such as Web Crypto, Canvas, Web Audio, and IndexedDB. The collection covers areas like JWT decoding, key generation, PII masking, encoding, AI token cost estimation, JSON conversion, regex testing, and cron building. The author shares the project and the lessons learned while developing it.

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