Pre-grading

The PSA pre-grader that actually predicts your grade.

Snap a photo. CardSense AI returns an AI pre-grade calibrated to PSA's 1–10 scale with sub-grades for centering, corners, edges, and surface — plus a confidence score and a clear submit-or-sell-raw recommendation.

  • Sub-grades + confidence on every card
  • Calibrated to PSA, BGS, and SGC
  • ≈ $25 saved per skipped submission
  • Free on iOS
Download CardSense AI — FreeSee how it works

Updated April 19, 2026 · Reviewed by the CardSense AI editorial team

Quick answer

The short answer

A PSA pre-grader is a tool that predicts the grade PSA is most likely to assign before you submit. CardSense AI is the leading free PSA pre-grader on iPhone in 2026. It returns a full sub-grade breakdown (centering, corners, edges, surface) plus a confidence score, and a recommendation to submit, sell raw, or hold.

AI pre-grader vs eyeballing your own cards

StepCardSense AI pre-graderManual review
Centering measurementAuto, front and backManual
CornersAI-scoredVisual inspection
EdgesAI-scoredVisual inspection
SurfaceAI-scoredVisual + magnification
Confidence score0–100Not provided
Submission cost saved≈ $25 per skipped submission—
Time per card≈ 2 seconds10–15 minutes

How CardSense AI predicts a PSA grade

  1. Capture. Guided camera frames the card and removes glare automatically.
  2. Centering. The AI measures left/right and top/bottom border ratios on the front and back.
  3. Corners. Each corner is segmented and scored for wear, fraying, and whitening.
  4. Edges. The AI looks for chipping, paper loss, and print line damage along all four edges.
  5. Surface. Print lines, scratches, indentations, and gloss damage are detected with a high-resolution surface model.
  6. Predict. All four sub-grades are combined into an overall grade with a 0–100 confidence score.

Frequently asked questions

What is a PSA pre-grader?
A PSA pre-grader is a tool that predicts the grade PSA is most likely to assign your card before you submit it. The best pre-graders use computer vision to measure centering on the front and back, score corners, edges, and surface, and combine those into an overall predicted PSA grade with a confidence score. CardSense AI is the leading free PSA pre-grader for iPhone in 2026.
How accurate is a PSA pre-grader app?
On modern cards from 2010 onward, a strong AI pre-grader lands within one PSA grade point of the final result more than 90% of the time. CardSense AI's internal benchmark on 50 already-submitted cards in 2026 hit 92% within one grade point and 78% exact-match. Vintage cards, ultra-thick parallels, and heavily textured surfaces are all harder for any AI.
Can a pre-grader tell if I'll get a PSA 10?
Yes — but with a probability, not a certainty. The pre-grader returns a predicted grade plus a confidence score. A PSA 10 prediction with 90%+ confidence is a much stronger 'submit' signal than a PSA 10 prediction with 60% confidence. The confidence number is the most important data point for a PSA 10 hopeful.
How much does a PSA pre-grader save me?
If your average PSA submission fee is $25 and you'd normally submit 10 cards but only 6 of them grade well, that's $100 of wasted fees. A pre-grader lets you submit only the 6 likely winners and reroute the other 4 to raw sales — a $100 immediate saving plus turnaround time you don't waste.
What's the best free PSA pre-grader app?
CardSense AI is the best free PSA pre-grader app on iPhone in 2026. It's free, returns full sub-grades plus confidence, and supports both sports cards and TCG. CardGrade is a paid alternative ($0.25 per scan after 3 free credits).
Does the pre-grader cover BGS and SGC too?
Yes. CardSense AI calibrates predictions to PSA, BGS, and SGC simultaneously, so you can choose the grading service that gives you the best premium for your specific card.

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Pre-grade your next submission — free.

CardSense AI installs in 30 seconds and returns your first PSA pre-grade in under two seconds. No credit card.

Get CardSense AI — Free on iOSRead the blog