/ About KANJIN

Small shops run on regulars. We help them keep them.

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 a poster on the counter. They download nothing.

Most cafes, bakeries, barbers, salons and florists know their regulars by face and keep no list. So there is no one to write to on a slow day, and no clear number for what the day made. The tools that fix this are built and priced for chains. KANJIN is built for shops people walk into, with one location and a small team.

Industry: Software for small shops
Based in: Taiwan
Works with: Square, or next to any register
Languages: 5

/ The product

A card for the customer. A back office for the owner.

Public beta · live since October 2026

The KANJIN back office: a conversation that greets the owner, reports yesterday’s stamps and sales, and offers the next thing to do — TodayThe owner’s screen. Yesterday in one line, and one thing to do next.

A customer’s stamp card on a phone, showing two stamps of eight and the reward it is counting towards — The stamp cardOn the customer’s own phone. No app to download.

The counter poster, previewed in the back office: the shop name, the reward it is counting towards, and the QR code a customer scans to join — The counter posterCustomers scan it to join the card.

The Sales & costs screen, with the day’s register total on one side and a supplier invoice on the other — Sales and costsThe day’s sales beside what the suppliers cost.

Watch it set up, start to finish Read the manual

What each plan includes

Free

$0, no card

Free for as long as you use it.

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

Paid plan

$39 a month per shop

30 days free for a new business. Up to 5 shops on one account.

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

See every feature

Also in Free

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

Also in Paid plan

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

Compare the plans on the pricing page

/ The team

A small team in Taiwan, building for small shops everywhere.

Roy C.

Founder

Roy has 18 years in sales and marketing: 15 years with the KANJIN Group and 3 years with Buima Group. Much of that work was helping retailers build apps to market to their own customers. KANJIN takes what worked and gives it to every small shop, free.

Lillian T.

Marketing

5 years in retail marketing.

Mira C.

Design

10 years in commercial design.

Chloe C.

Customer support

2 years in CRM.

/ Our story

Built for small shops.

Where it started

KANJIN began in Taiwan, in a pilot with barbers, salons, cafes, florists and small shops. It was a simple stamp card on a phone number, emails to their regulars, and local creators invited in. What worked there became kanjin.app.

Why the name

KANJIN is two Japanese words that sound the same. 肝心 means the heart of the matter. For a shop, that is the people who come back. 勧進 is older: monks walked the town asking each neighbour for a small gift to rebuild the temple or the bridge.

No rich patron paid for it. Many small gifts did. A cafe or a salon stays open the same way: many small visits from people who keep choosing it.

Why this exists

A shop with slow days has two easy options, and both are bad. A discount cuts the price for people who would have paid in full. Ads put it up against chains with far bigger budgets.

What works is a regular who comes back, and a local creator who visits and tells people. KANJIN makes that repeatable: email your regulars on quiet days, invite local creators, and ask for a Google review the same way every time, not only when a customer seemed pleased.

/ Our promise

What we promise, and how we make money.

Free means free

The stamp card, the counter kiosk and the back office are free for as long as you use them. No card to start, and no time limit.

One fair price for more

PRO is $39 a month per shop, with 30 days free for a new business. That fee is how we make money. We take no cut of your sales, and creators pay nothing to be found.

Your customers stay yours

We never sell or rent your customer list. It belongs to your shop. The back office is kept on our servers, on every plan, free included, and you can download your customers from Settings at any time.

What we will not do

Filter your reviews

Review requests go out the same way, whatever a customer seemed to think. Asking only the pleased ones is called review gating. It breaks Google's rules.

Hide that a meal was free

Creators must tell their audience when a meal was free. That is the law, and we will not help anyone get around it.

Lock in your data

Settings gives you your customers, your items and everything else in one file, on either plan. Your records are yours to take or to delete.

Get in touch

More than 5 shops, something broken, or a feature you need: a person reads this address and replies.

KANJIN is built and run in Taiwan by Roy Chen, founder of KANJIN. The same small team that builds it reads this inbox and replies.

hello@kanjin.app

See also our privacy policy and terms of service.