Slabline is a card-valuation and collection-management platform for sports cards, Pokémon, and other trading card games. It provides comp-backed values for graded cards from PSA, BGS, SGC, and CGC, drawing on catalogued card data, comparable sales, grading populations, and dealer spreads. Users can search by certification number or card name, track collection values and performance, and import holdings from supported marketplaces, other trackers, or a spreadsheet.

Beyond price tracking, Slabline helps collectors assess what to do with their cards. Its 0–1000 Slabline Score brings together factors such as value, grading potential, and protection. Tools estimate likely grades by grading company, compare potential grading returns with fees, rank raw cards by expected grading profit, and highlight the difference between market value and quick-sale offers. Collection tools include Stack Scan for adding slabs, photo-based Pre-Grade estimates, and Slabline Vision for phone-based scanning. Slabline offers free access for up to 25 cards, with paid plans starting at $9.99 per month. Its estimates are informational, not certified appraisals or financial advice.