How it works
- Step 1
Photograph the card
Add a straight-on photo of the front and the back — graders score centering on both sides — plus corner close-ups if you can. Good light, no glare.
- Step 2
Slabline reads the condition
The AI assesses the four factors graders weigh most — corners, edges, surface, and centering — using your measured centering when you have it.
- Step 3
Get the grade & value
See the grade it would likely receive on the PSA, BGS, SGC, CGC, or TAG scale, the factor holding it back, and the estimated value at that grade.
What Pre-Grade looks at
Professional graders score a card on four things, and a card’s grade is held down by its weakest one. Pre-Grade reads each from your photo:
- Centering
How even the borders are — the most common reason a card misses a 10, and the one factor you can measure exactly.
- Corners
Sharpness vs. softening, fraying, or dings under magnification.
- Edges
Chipping, whitening, and wear along all four edges.
- Surface
Scratches, print lines, indentations, gloss, and stains.
How Slabline Pre-Grade compares
Most pre-grade tools stop at a predicted grade. Here’s where Slabline matches them — and where it goes further.
Reflects common point-tool features; individual tools vary. Slabline’s accuracy is measured from collectors’ own reported grades, not a fixed sample.
Pre-Grade FAQ
- Can AI predict a card’s grade from a photo?
- Yes — Pre-Grade reads a photo for the same factors a grader weighs (corners, edges, surface, and centering) and predicts the grade the card would likely receive, capped by its weakest factor. It’s a photo-based estimate, not a guarantee; only the grading company’s certified grade is the ground truth.
- Will my card get a PSA 10?
- Pre-Grade gives you a likely grade range and the single factor most likely to hold the card back — usually centering or a soft corner — so you can judge your odds of a PSA 10 (or the BGS / SGC / CGC / TAG equivalent) before you pay to submit.
- Is it free?
- Yes. Try one scan free with no account. A free Slabline account includes 5 scans a month, and paid plans add unlimited scans with a more capable model.
- Which grading companies does it support?
- The 1–10 condition estimate is shown on the PSA, SGC, CGC, and TAG scales, with BGS subgrades for centering, corners, edges, and surface. Slabline is independent and not affiliated with PSA, BGS, SGC, CGC, or TAG.
- Do I need to send my card in to use it?
- No. Pre-Grade works entirely from photos before you submit, so you can decide whether grading is worth the fee. If you do grade it, you can then track the slab’s live value and risk Score in Slabline.
Deciding whether to grade?
Grade looks promising?
Measure centering exactly, run the grading-ROI math, then track the slab’s live value and risk Score once it comes back.
