Show HN: ShadowCat – file transfer through QR Codes in a Browser

Category: other

Tags: file-transfer, qr-code, offline, single-page-app, retro-tech

Score: 6.5/10 (Innovation: 7, Technical: 6, Documentation: 7, Utility: 6)

ShadowCat is a single-file HTML page that enables offline file transfer between devices using QR codes, designed specifically for old phones with broken radios but functional cameras and browsers. It implements a custom protocol with chunking, error correction, and CRC verification, making it a creative solution for data transfer in constrained environments.

Target audience: backend devs, devops, data engineers

Repository: https://github.com/unprovable/ShadowCat · HTML

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