Digital stamp card
A free digital stamp card that runs on phone numbers
No app for your customers. No card fee. No contract. Print a poster, type a number, give a stamp. Free forever on your own tablet.
Needs a free account. No card and no time limit.
Print the counter poster
KANJIN makes a sign with your shop name and your rule, such as "10 stamps, 1 free coffee". Print it and stand it by the register.
The customer gives a phone number
Staff type it on the tablet. That number is the card. There is no app to install and no plastic card to lose.
Each visit adds a stamp
Type the same number again and the card gets one more stamp. When the card is full, the screen says a reward is due.
What is free
The card is free. Automation costs $39 a month.
Free forever
- Stamp card by phone number, on your own tablet
- Printable counter poster with your rule on it
- Your list of regulars, saved on your device and in a folder you pick
- Export everything as a file whenever you want
$39 a month adds
- Automated Vendor Settlement reports from your ledger
- A QR code on the poster, so customers join from their own phone
- A review request email after each visit
- One-tap email to your regulars on a quiet day
Compared
How the price compares
Prices as published by each vendor or by independent reviews in September 2026. Follow the link on each row to check.
| Product | Price | How customers join | Contract |
|---|---|---|---|
| KANJIN (this site) | Free forever. $39 a month for review requests and Slow Day SOS emails. | Phone number typed at the counter. QR code on the paid plan. | None. Cancel any time. |
| Loopy Loyaltysource | From $25 a month after a 15-day trial. | Card added to Apple or Google Wallet by scanning a code. | Monthly. |
| Stamp Mesource | From $49 a month after a 30-day trial. | Customer installs the Stamp Me app. | Monthly. |
| Square Loyaltysource | Part of Square Plus, about $49 a month per location. | Phone number at the Square register. | Monthly. Needs Square as your register. |
| Loyalzoosource | From $77 a month after a 7-day trial. | Phone number or email at a Clover or Square register. | Monthly. |
Where a rival is stronger: Loopy Loyalty and Square put the card in the customer’s phone wallet, and Square and Loyalzoo add stamps automatically at the register. KANJIN does not do either yet.
Questions
Common questions
- Do my customers need to download an app?
- No. Their phone number is the card. Staff type it on the tablet. On the paid plan, customers can also scan a QR code and type the number on their own phone.
- Is the free stamp card really free?
- Yes. It is not a trial. It needs a free account and no card. Your list stays on your own device, which is why it costs us almost nothing to give away.
- What does the paid plan add to the stamp card?
- Automated Google review requests after each visit, Slow Day SOS emails to your regulars on a quiet day, a QR code on the poster so customers join from their own phone, and Automated Vendor Settlement reports from your ledger. It costs $39 a month per location.
- How many stamps should a reward take?
- Ten is the default. A cafe with daily regulars can use eight to ten. A salon or barber, where visits are weeks apart, is better at four to six, so a customer sees a reward within a few months.
- What happens to my customer list if I stop using KANJIN?
- On the free plan it was always on your device, so there is nothing to take back. On the paid plan you can export it as a file at any time.
Setting up the tablet? Read the hardware guide.
Fill your quiet days without cutting prices
A discount cuts the price for everyone who would have paid anyway. KANJIN emails your regulars only on the days you need them, and finds local creators you can invite.
- Calculators need no account
- The back office is free
- Cancel any time