FREE
Stamp card & regulars
Customers join with a phone number. You see who your regulars are, and who stopped coming.
Start your card
For cafes, salons and small shops
Frictionless loyalty for your shop. Free stamp card + email marketing, all in one.
Turn walk-ins into regulars.
Start freeSee what is inside.
Turn walk-ins into regulars.
Customers join with their phone number. No app to download. Every visit adds a stamp to their card.
← BackFind local creatorsClose ✕
ExampleCreators near a shop like yours
Local cafe and pastry reviewer
8.4k followers
YouTube
Neighbourhood food walks
21k subscribers
Coffee and brunch
3.1k followers
Stamp addedNo app for the customer
Review request sentBy email, after the visit
Win-back email sentTo regulars who stopped coming
Rainy-day email sentAutomatically, 3 rainy days ahead
Birthday email sentA treat on their birthday
/ For cafes, salons, barbers, bakeries & walk-in shops
FREE Stamp Card & Back Office for Small Shops.
Turn walk-ins into regulars, automate review requests and customer emails, and find local creators, in one app.
- $0, no time limit
- Unlimited customers
- Works with Square, free
- Free CSV export
KANJIN (kanjin.app) is a free digital stamp card and back office for small walk-in shops.
Your free back office: the stamp card, 20 review requests and 5 reply drafts a month, daily Sales & costs. No time limit.
Start free/ Works next to what you already use
SquareConnects to SquareAny POSRuns beside it
WindowsWorks in your browserMacWorks in your browser
Any tabletKiosk at the counterQR posterCustomers scan to join
CloudSaved online, on every deviceCSV exportYour list, any time
Google reviewsReview requestsAI repliesDrafts you approve
InstagramLocal creators near youYouTubeLocal video creators
$0
The stamp card, for any number of customers, with no time limit
19
Free tools for small shops, no sign-up
30days
To try the paid plan free, for a new business
5
Languages: English, Chinese, Japanese, Spanish, French
/ How it works
Three things happen at your counter. KANJIN does the rest.
01 · THE STAMP CARD
A phone number at the counter. The stamp lands on their phone.
Connect Square, and a regular’s Square payment can add the stamp. Customers see their card in the browser, with no app.
0
apps to download
02 · GOOGLE REVIEW REQUESTS
After the visit, one email asks each stamp card holder for a Google review.
With your review link, and one reminder 4 days later. AI drafts replies.
20
free a month
03 · SLOW & RAINY DAY INVITATIONS
On a quiet, wet afternoon, your stamp card holders get an invite.
Sent automatically on the first of 3 rainy days, at most once a week. KANJIN writes it in your words; you can change them any time.
PRO
paid plan
/ What your customers see
No app for your customers. A poster, a tablet and their own phone.
1They scan the poster
The code on your counter opens their card. Nothing to download.
For you: Their number joins your customer list on the first visit.
What you can do with everyone who joins
- FREESee your regulars, and who has stopped coming
- FREEAsk for a Google review after each visit: 20 a month free
- FREEEmail your list a special: 1 email a month free, up to 150 people
- FREEDownload your whole list any time
- PROA “we miss you” email when a regular stops coming, and a birthday treat
- PROSlow-day and rainy-day emails to your regulars
/ What is inside
One free back office. Everything a small shop runs on.
FREE · 20 A MONTH
Google reviews
After a visit, one email asks for a Google review. AI drafts your replies, and you approve each one.
Ask for reviews
FREE 1 A MONTH · PRO AUTOMATIC
Email your regulars
Send a special to your list. On paid, win-back, birthday and rainy-day emails go out by themselves, and KANJIN writes the slow-day ones for you to send.
See the emails
PRO
Rain tomorrow? Email your regulars tonight.
KANJIN reads your shop’s forecast and writes the email. You press Send.
See slow-day emails
PRO
Find local creators
Find Instagram and YouTube creators near your shop who post about places like yours, and invite them in.
See how it works
FREE
Sales & costs
Enter today's register total and each supplier receipt to see what you really keep.
Open your books
FREE
Counter poster & kiosk
Print the poster, open the kiosk on any tablet, and customers stamp themselves during a rush.
Print your poster
01No app for your customers to download
02Stamps stay safe if a phone is lost
03Your customer list downloads any time
04No credit card to start
/ For your trade
Built for how each small trade works.
A cafe counts coffees, a salon counts visits, a barber counts cuts. Set the reward that fits how your customers come back.
See all 11 trades
CafesCount coffees. Invite back the regular who has been gone three weeks.
SalonsCount visits, and ask for a review after each one.
BarbershopsNo paper cards to lose in the wash.
BakeriesA treat after ten visits, stamped at the register.
Nail studiosBirthday treats and win-back emails on paid.
RetailRegulars who pay with Square can get stamped automatically./ Bonus marketing
PROLocal creators, found for you.
KANJIN finds Instagram and YouTube creators near your shop, in the language they post in, and works out the return before you give anything away. The invitation is written for you. You read it and press Send.
Win-back emails
A regular who stops coming gets a “we miss you” email. You choose how long away counts as too long.
Slow-day and rainy-day emails
The slow-day email is drafted for you to read and send. The rainy-day email goes out on its own, in your words. Sent automatically on the first of 3 rainy days, at most once a week.
Welcome, birthday and bring-a-friend
A treat that goes out on its own, with your own offer.
Review requests with no monthly cap
Everyone who agreed is asked after a visit, with one reminder.
Paper cards, loyalty apps, or KANJIN
| What matters at the counter | Paper punch cards | Typical loyalty apps | KANJIN |
|---|---|---|---|
| Customer downloads an app | No | Yes | No — phone number or QR |
| If a card or phone is lost | Stamps are gone | Account login needed | Stamps stay safe on their number |
| Google review requests | Ask face-to-face | Separate tool | 20/mo free (No limit on paid) |
| Local IG & YouTube creators | No | No | Built in (Paid plan) |
| Your customer list | None | Locked in their app | Free CSV export any time |
/ The honest trade-off
Free runs your counter. Paid runs your marketing.
The free plan has no time limit and no customer cap. Pay only when you want KANJIN to send the emails for you.
Free · $0
No card. No time limit.
- Unlimited customers and stamps, by phone number — no app for customers
- 20 Google review requests a month, by email
- One email to your list a month, up to 150 people who agreed to hear from you
- Using Square? Connect it free: a payment stamps a customer’s card, and Analyze your sales reads your Square sales
- Download everything, any time
- Sales & costs: the day’s sales, supplier receipts and what is left after them
- The Counter poster’s QR code and the kiosk on any tablet, so customers join by themselves
- 5 AI review reply drafts a month: paste a review, KANJIN drafts a reply, you edit it and post it on Google yourself
- Staff logins for up to 10 people, as manager or counter, and Counter Mode: a PIN that locks the tablet
- Each customer’s own card page, on their phone, with a “Leave a Google review” button and no monthly cap
- Profit by item: which items make the money
- Break-even, Lost revenue and Paying your team calculators
- See your regulars, and who is slipping away
- One shop per account
Paid plan · $39 a month
30 days free for a new business. Cancel any time.
- Everything in Free
- A “we miss you” email when a regular stops coming. You choose how late counts; it goes at 6 pm, shop time
- Local creator discovery: YouTube and Instagram creators near your shop, found by city and trade, with the invitation drafted
- Supplier payments and Profit analysis: what each supplier is owed, and where the money went, printable for your accountant“Profit by item” is the free menu calculator. “Profit analysis”, inside Supplier payments, adds your real supplier bills to it.
- A slow-day email to your regulars: KANJIN drafts it, you read it and press Send
- A rainy-day email: your shop’s forecast, and the email written for the wet day you pick
- Review requests with no monthly cap: one per customer after a visit, then not again for a year, to everyone who left an email and agreed
- 20 AI review replies a day, not a month
- A welcome email for new customers and a birthday email, each with your own treat if you want one
- Bring a friend: a new customer names who sent them, and that friend gets a stamp
- Reward reminders: a nudge when a customer is close to their reward (you choose how close), and a reminder if a reward is still waiting a week later. The reward-ready email on the day a card fills is free on every plan
- Import your customers from Square or a spreadsheet. Nobody imported is emailed until they say yes
- Your logo and colour on the kiosk and on every customer’s card, and no “Sent with KANJIN” line on your emails
- Up to 5 shops on one account, $39 a month for each shop on the paid plan
- Up to 1,000 customers at a time and 2 sends a week, instead of 1 a month to 150
- Emails go only to your own customers. KANJIN has no lists to sell you
What owners said in our pilot.
8
SHOPS IN OUR PILOT
Our first shops, in Taiwan, Vancouver and Seattle, before kanjin.app existed.
Barber
Guys always lost or washed their paper stamp cards. Now they just give their phone number after a cut.
Wayne C.Barber, Taichung
Hair salon
Asking clients for a Google review face-to-face felt awkward. Now they get an email with our review link after their visit.
Kevin T.Hair salon, Vancouver
Pilates studio
Drop-in students hate downloading apps. Here they just give their phone number and every class counts.
Emily K.Pilates studio, Kaohsiung
Florist
We couldn’t afford a PR agency for our opening. KANJIN found local lifestyle creators on Instagram and YouTube and helped us invite them.
Katherine W.Florist, Taichung
Vintage shop
Small shops get bled dry by monthly software fees. This runs on an old tablet next to our register, free, with no customer cap and no credit card.
Kelvin W.Vintage shop, Tainan
Lash & brow studio
We were going to use LINE for points, then saw the message fees. A free monthly email to our regulars does the job.
Becky C.Lash & brow studio, Hsinchu
Dreamscape Massage
Rainy days used to empty the shop. Now our regulars get a rainy-day invite by email.
Dr. LinDreamscape Massage, Vancouver
Roastery cafe
If a coffee regular is gone for three weeks, they’ve found another cafe. Now we know who to invite back.
Trey O.Roastery cafe, Seattle
19 free tools for small shops. No sign-up.
See all free toolsCHECKLISTGet foundCALCULATORStamps per rewardCALCULATORCustomer valueCALCULATOREmail ROICALCULATORBreak-evenCALCULATORDiscount ROICALCULATORMenu matrixCALCULATORCapacityCALCULATORReview gapCALCULATORBooth rentCALCULATORFood costCALCULATORTip poolANALYZERSales analyzerMAKERReview QR cardGENERATORReview replyMAKERStamp cardSPREADSHEETCash-up sheetMAKERPrice increase noticeMAKERGift certificates
Public beta, live since October 2026, with free and paid plans open. More about KANJIN
Set up your free stamp card. Let's start.
It runs in your browser, on the tablet or phone you have. No app for customers, no credit card, no time limit.
hello@kanjin.appWorks with Square
Questions owners ask
KANJIN (kanjin.app) is a free digital stamp card and back office for small walk-in shops. Customers join with their phone number or by scanning your counter poster, and they download nothing. The free plan has no time limit, needs no credit card, and includes 20 Google review requests and 5 AI review reply drafts a month.
No. Their phone number is the card, or they scan your counter poster with their phone’s camera.
Free, with no time limit, no customer limit and no credit card. You pay only when you want KANJIN to write the emails that bring regulars back. The free plan has no time limit and nothing is charged until you start the paid plan yourself. The paid plan is $39 a month, or $390 a year, per shop (plus sales tax where it applies), with 30 days free for a new business.
It is yours. Download the whole list as a spreadsheet any time, free, from Settings.
No. Using Square? Connect it free, and a regular paying with Square gets their stamp without anyone typing a number. KANJIN otherwise runs in the web browser on any phone, tablet or computer, beside whatever you use now — or on its own, if you do not run one.
Yes. Give them a counter login, which cannot open your takings, your costs, what anyone is paid, or Settings. Or lock a shared tablet to the stamp card with Counter Mode and a four-digit PIN. Shift notes stay open to staff either way, and you can switch on a screen for the day’s total if you want them to log it.
Everyone who left an email and agreed to hear from you, asked the same way. KANJIN sends it 60 minutes after their stamp, or after the time you set in Send it after. If they do not click, one reminder follows 4 days later. Then nothing again for a year.
Every country. The stamp card works anywhere, and so does email.
They keep what they have collected. At the counter you can set how many stamps the next scan gives, so somebody with six on a paper card joins with six. If you already keep a list in a spreadsheet, the paid plan can import it with each customer’s stamps.
You do. Your customers’ data is yours. We never sell it, never email anyone without their yes, staff see only what you allow, and you can export or delete everything.
On our servers, on every plan, free included. Sign in on the counter tablet, the office computer or your phone and you see the same list. Your customers’ data is yours. We never sell it, never email anyone without their yes, staff see only what you allow, and you can export or delete everything.
Customers join with their phone number, so there is no app and no Wallet pass. The free plan has no time limit and no customer limit, includes 20 Google review requests a month, and lets you download your whole list. Where they are better: Loopy and FaveCard put a card in Apple and Google Wallet, Loopy sends push messages, and Stamp Me sends texts. KANJIN sends email only.