About SlabWorthie
Pre-grade before you pay to grade.
SlabWorthie is a card pre-grading workbench. You upload a photo or a flatbed scan of a trading card, and we produce a careful, hedged estimate of its centering — front and back — along with a visual surface reveal and corner/edge inspection aids. The goal is simple: help you decide which cards are worth the time and cost of professional grading before you mail them off.
Why we built it
Grading is expensive and slow. A submission can cost more than the card is worth raw, and centering alone often decides whether a card lands a gem-mint grade or falls a point short. Most collectors eyeball centering and hope for the best. We wanted a measured, repeatable second opinion that respects how grading actually works — so you spend your grading budget on the cards most likely to come back strong.
How it works
- Upload. Add a still photo or a flatbed scan of the card front, and optionally the back.
- Align. We detect the card and let you fine-tune the four corners, then straighten the image.
- Measure. You confirm the inner and outer border lines and we compute a centering ratio using the narrowest opposing edges, plus a hedged grade cap based on common company tolerances.
- Inspect. A relit surface view and corner/edge aids help you spot whitening, print lines, and scratches with your own eyes.
What we are honest about
SlabWorthie produces estimates, not professional grades. We are independent and not affiliated with PSA, Beckett (BGS), SGC, CGC, TAG, or any other grading company, and our numbers can differ from theirs. We never invent a centering number when the image doesn’t support one, and the surface view is a visualization to aid your inspection — not a score. Treat our output as a well-reasoned starting point, not a guarantee.
Who it’s for
Collectors and sellers of Pokémon, sports, Magic, Yu-Gi-Oh!, One Piece, and other trading cards who want a faster, cheaper gut-check before submitting to a grader — and a tidy record of what they’ve inspected.
Questions or feedback? Visit our contact page or read the grading guides.