| Slabline | CardGrade | |
|---|---|---|
| Values from recorded sales, by grade | Every grade, from 6.25M recorded sales (eBay, marketplaces, auction houses incl. Heritage and Goldin) | Market value estimates (source not named) |
| Population / gem rate | PSA, BGS, SGC & CGC (GemRate) | — |
| AI Pre-Grade (free allowance) | 10 free a month with a free account (2 as a guest) | 1 free first grade for eligible new accounts; PSA/BGS/CGC |
| Insurance / appraisal schedule | Insurance-ready appraisal schedule | — |
| Cert lookup | PSA, BGS, SGC & CGC | PSA, BGS, CGC, SGC & TAG |
| In ChatGPT | Listed ChatGPT app | — |
| Price | Free; Collector $9.99/mo; Insured $14.99/mo; Pre-Grade packs from $0.99 | Hobby $4.99/mo to Business $74.99/mo; packs $9.99–$99.99 |
| Cards covered | 1.57M cards: sports, Pokémon, Magic, Yu-Gi-Oh, One Piece, Lorcana, Riftbound and more | Pokémon, baseball, basketball, football, hockey, Magic, Yu-Gi-Oh, One Piece, Lorcana |
| Platforms | iOS, Android, web, ChatGPT | Web, iOS, Android, Chrome extension |
Facts as of November 4, 2026.
— = not found in the app’s public listing or website as of November 4, 2026. It may exist; we could not confirm it.
Names belong to their owners. Facts are from each app’s public App Store listing, website or press release as of November 4, 2026. Corrections welcome — email brian@hobbysmartcases.com.
What CardGrade does well
- PSA, BGS (with sub-grades) and CGC predictions on every report
- Chrome extension and a grading API for developers
- Cert lookup for PSA, BGS, CGC, SGC and TAG
Where Slabline differs
- Slabline values every grade from 6.25M recorded sales, with the sources named
- Population and gem rate across PSA, BGS, SGC and CGC
- 10 free Pre-Grades a month versus one free first grade
- Insurance-ready appraisal schedule; listed ChatGPT app
Accuracy claims: CardGrade’s March 12, 2026 press release claimed “92.8% accuracy”. Its blog post on the topic (updated September 15, 2026) now says it does not publish a single headline accuracy percentage.
Which should you choose?
- Choose CardGrade if…
- You want three-grader predictions, a browser extension or an API, and grade in volume.
- Choose Slabline if…
- You want the grade estimate next to what the card actually sells for at that grade, population data, and insurance documentation.
See it on your own card
Pre-Grade a raw card free — 10 a month with a free account — or look up what a graded card sells for at every grade.
