Privacy policy

Last updated October 5, 2026

Rhombus is an iPhone app that identifies sports cards, shows their market value and tracks your collection. This policy explains what we collect and why.

What we collect

• Account. When you sign in with Apple, we receive an identifier and, if you choose to share it, your name and email.
• Card photos. Photos you scan are used to identify the card. We keep them only if you save the card to your collection.
• Your collection. The cards you save, what you paid, the date, where you bought them and the quantity.
• Prices you choose to share. If you turn on anonymous price sharing, the price you paid is added to our market data without your name or account.
• Usage. Basic app events such as scans and screens viewed, used to fix problems and improve the app.

How we use it

To identify cards, show values, keep your collection in sync across your devices, run your subscription and improve Rhombus. We do not sell your personal information.

Purchases and links

Subscriptions are processed by Apple; we never see your payment details. Some links to marketplaces such as eBay are affiliate links, so we may earn a commission at no cost to you. Those sites have their own privacy policies.

Your choices

You can export your collection, turn off price sharing, or delete your account and its data at any time from Settings in the app.

Contact

Questions about this policy: hello@rhombusapp.com