Observed arrival · 2026-11-08
OpenSlabGrader: Card grading you can check
A planned open-source project for measuring trading cards from ordinary flatbed scans and recording how each measurement was made.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Trading-card collectors, shops, graders, and developers
- Worth noticing
- The first release is still being prepared; the code is not yet published, and English-language cards come first.
Field notes
The proposed process starts with a consumer flatbed scan and names four assessment areas: centering, corners, edges, and the cut. The site says each result would be stored alongside the scan and measurement method, so another person could rerun it. The project identifies Apache 2.0 as its license, but says the first release is still in preparation and the code is not yet available.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
◎NicheUnusually specific use
One card from the complete issue