TLDR
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Browser-based precision tool for marking points and bezier polygons on images, exporting clean JSON or YAML with no upload or account required.
Key Takeaways
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Supports points, polylines, and closed polygons on the same image; bezier curve handles with Alt/Shift symmetry control.
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Configurable origin (top-left, bottom-left, center, or custom) and Y-axis flip covers both screen-space and math-space workflows.
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Toggle between absolute pixels and 0-1 normalized coordinates; round-trip JSON loading lets you reload and edit prior sessions.
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Installs as a PWA for offline use; 100-step undo history and keyboard nudging (1px / 10px) included.
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Primary use cases: 2D game collision boundaries, ML annotation regions, UI hotspots, pathing waypoints, and floorplan markup.
Hacker News Comment Review
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No substantive HN discussion yet.
Notable Comments
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@magikMaker: Builder published a blog post walkthrough of tack. at bjornwikkeling.com for additional context on the tool’s design.
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