Retail POS · iPad · iPhone · Stripe S710 · Desktop
u.POS is a retail POS that sells the same products, stock and sales across iPad, iPhone, Stripe payment readers and PC. The server confirms every payment, and one admin console runs the rest.
Platforms
Every app uses the same API and the same design system. iPad at the counter, an iPhone or a single reader at a pop-up, a PC in the back office — mix them freely and sales and stock still add up in one place.
A POS that runs directly on the Stripe payment reader. From picking products to card payment and receipt, it all happens in one hand.
Kotlin · Jetpack Compose · Stripe Terminal
Landscape for the counter. Catalog and cart at a glance.
For pop-ups and mobile sales. The iPad features in portrait.
For PC checkouts. Fast with a barcode scanner and keyboard.
Run the whole operation in the browser.
Payment flow
Receipts print only after the server — not the app screen — confirms the payment through Stripe's signed notification. If the app closes midway, the order picks up where it left off.
The catalog, prices and available stock for the location come from the server.
POSThe server recalculates with its own prices and reserves every SKU at once.
ServerTake a card on the Stripe reader, or cash with the amount tendered and change.
POS · ReaderThe webhook signature is verified, the order is marked paid and reserved stock becomes a sale.
ServerThe confirmed receipt goes to the store printer — Japanese, Korean and QR intact.
POS · PrinterAfter handover, sales, reconciliation and reports live in the admin console.
AdminIdempotent A repeated request is applied to payments and stock only once. An app timeout is never treated as a failure.
Features
Stripe Terminal S700, S710 and WisePOS E. After a decline or cancel, the same payment is collected again.
Tendered amount and change, float and paid in/out records, expected balance.
Bluetooth, LAN and OS printers. Printed as images, so Japanese and Korean work on any model.
Addressee and description, reissues numbered and kept in the history.
Scan the receipt QR, choose items, refund in full or in part. Managers only.
Reserved on order, sold on payment. Receiving, counts and transfers all stay in the ledger.
Sales by location and period, CSV, and read-only share links for partners.
Admin, manager and staff roles, registered devices only, two-factor for admins, audit log.
Architecture
Cloudflare Workers answers from close to wherever you are.
Webhooks are stored first; queues and scheduled jobs handle retries and reconciliation with Stripe.
A single OpenAPI contract keeps every app and the admin console on the same data.
Clients
FAQ
You can sell on iPad (landscape), iPhone (portrait), Stripe Reader S700/S710 payment terminals (running directly on the reader) and macOS or Windows desktops, and manage everything in the browser-based admin console. Every device shares the same products, stock and sales data.
Card payments through Stripe Terminal readers (S700, S710, WisePOS E) and cash. For cash, the POS calculates the amount tendered and change, and the register screen tracks the float, paid-in and paid-out amounts and the expected balance.
Payments are confirmed by the server after it verifies Stripe's signed notification, not by the app. If the app closes or the network drops, the order stays on the server and resumes when the device reconnects, and a repeated request is applied to payments and stock only once. Card payments themselves require a connection.
ESC/POS thermal receipt printers over Bluetooth, LAN (port 9100) or the PC's OS printer driver. Receipts are rendered as images, so Japanese, Korean and QR codes print correctly on any model.
Yes. On the payment-complete screen, enter the addressee and description to issue a formal receipt; reissues carry a copy number and are kept in the history. Issued receipts and cancellations are visible in the admin console.
Yes. Stock and prices are kept per location and SKU. Stock is reserved when an order is created and turned into a sale once payment is confirmed, and every receipt, count and transfer is recorded in the stock ledger.
There are three roles: admin, manager and staff, and only managers and above can refund. Only devices registered in the admin console can sign in to the POS, admin accounts can use two-factor authentication with an authenticator app, and key actions are written to the audit log.
Tech stack
Get started
Register devices and set up products and prices in the admin console. For a consultation, get in touch below.
