Sports cards · iPhone

Scan a card. See every sale behind its price.

Rhombus identifies the exact card, parallel and grade, then shows recent sales for that copy, the ones it left out and why, and what's live right now.

Coming soon to the App Store hello@rhombusapp.com

Comps for a 2023-24 Prizm Wembanyama Silver PSA 10 with a sales chart

A scanned Wembanyama Silver Prizm with its value

Scan it

Point your camera at any card. Rhombus reads the year, set, number, parallel and grade.

A sale left out of the value because it is a different year

Trust the comps

Lots, reprints, wrong years and hidden Best Offer prices stay out of the value, each with its reason.

A collection worth $29,054 with gain against price paid

Track your collection

Every card valued at today's market for the exact copy you own, against what you paid.

One sale with the grade, parallel and numbering read from its title

Every sale, read

Tap any sale to see the grade, parallel and numbering read from its listing, and whether it counts.