Three questions that matter more than price
Does the customer have to install an app? If yes, expect most of them to decline at a counter with a queue behind them. This kills more programs than pricing does.
Does it require a specific POS? Square Loyalty is the most accurate option here because it ties the reward to the actual transaction — and it is unusable unless you run Square. If you take cash and transfers as often as cards, that is a large amount of infrastructure to adopt for a stamp card.
What happens to your customer list if you leave? Ask before you start, not after you have two thousand members.
Reading the price ladders honestly
Loopy Loyalty's $25 Starter allows one card design and one location. Stamp Me's $49 Lite is a limited-time price against a $100 regular rate. Square is $45 per location with no volume discount, so three sites is $135.
Bioflow is $10/month flat and includes the link-in-bio side, which none of the others have. The trade-off is that it does not issue Apple or Google Wallet passes — the specialists do.
What a free tier is actually good for
Testing whether your regulars engage at all. Loyalty vendors publish ROI multiples that assume the program causes visits; in practice most of the lift is pulling forward visits that would have happened anyway.
Run the mechanic cheaply for a quarter and watch repeat-visit frequency, not enrolment count. Enrolments flatter every program ever built.