Can I offer a digital stamp card without an app?
Yes: Fideliya turns your paper stamp card into a digital stamp pass that lives in Apple Wallet and Google Wallet, with no app for your customers to download. The result is a stamp count that cannot be thrown out with a receipt, and a named record of every regular, so you can see who comes back and who has slipped away. Customers scan a QR code at your counter, fill in one short form with a name and an email, and the pass is saved to the wallet already on their phone. When staff scan it, a stamp is added and the pass updates right in front of them. When they reach your goal, the pass shows the reward they earned. The pass looks like your venue too: Fideliya ships 36 designed pass themes, with eighteen of them on the Free plan, and your logo goes on every one.
A paper stamp card turns into the same card as a pass in Apple Wallet, with its stamps.

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Related answers
How does a Google Wallet stamp card work?
A stamp pass in Google Wallet replaces the paper stamp card: one scan adds one stamp, and the reward shows when the goal is reached.
Can I run a loyalty program without an app?
Run your loyalty program inside Apple Wallet and Google Wallet, with nothing for you or your customers to download.
How does a loyalty card without an app work?
A no-app loyalty pass lives in Apple Wallet or Google Wallet and starts working at the first scan. Here is how it runs at your counter.
Your pass, ready in five minutes
14 days free. No card. If your regulars don't join, you pay nothing.