Show HN: Free tool to mark points and polygon regions

Category: devtools

Tags: image-annotation, coordinate-marker, polygon-tool

Score: 5.7/10 (Innovation: 5, Technical: 6, Documentation: 7, Utility: 6)

Tack is a browser-based tool for marking precise coordinates, polygon regions, and bezier curves on images, with export to JSON or YAML. It is interesting because it offers a free, privacy-focused (runs entirely client-side) solution for game developers, UI engineers, and ML data labelers, with features like multiple origins, normalized coordinates, and round-trip editing.

Target audience: backend devs, frontend devs, data engineers

Repository: https://tack.pics

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