OSPOS

Free point of sale for your phone. Cash always free, cards at 1%. Open source and self-hostable — the code is on GitHub.

Your iPhone is the entire register.

OSPOS is a point-of-sale app that turns your iPhone into a full POS — no hardware to buy, no monthly subscription, no contracts. Cash transactions are free, forever. Card transactions cost 1% on top of Stripe's standard processing rate (2.7% + 5¢ for in-person card-present in the US).

That's it. No setup fees. No hidden charges. No "starting at $0/month."

WHAT YOU CAN DO

• Accept cash from day one — works offline, no internet required • Accept cards using Tap to Pay on iPhone — no external reader needed • Build a menu with categories, prices, photos, and stickers • Add modifier groups: required vs. optional, single vs. multi-select, defaults that pre-fill the customize sheet • Mark items or modifiers sold out today without deleting them • Apply order-level discounts and comps with a reason note • Send digital receipts by email or text • Refund full or partial sales • Export your day's sales to CSV • See live daily totals (orders, gross, refunds, net) in the Summary tab

NEW IN v1.1 — BUILT FOR THE COUNTER

Modifier groups make OSPOS work for coffee shops, sandwich spots, taco trucks, ice cream stands, and any counter-service business with customizable items. Build "Choose your milk" as a required single-select. Build "Add toppings" as a multi-select with a max. Mark Oat Milk sold out when you run out, without touching the rest of your menu.

QSR mode adds a category filter strip above your menu for businesses with 20+ items across multiple categories. Flip it on in Settings.

The sticker library expanded to 193 curated illustrations across food, drinks, retail, and service categories — search "lettuce," "pickle," "iced coffee," and find the right visual instantly.

WHO THIS IS FOR

• Coffee shops and cafés • Food trucks and pop-ups • Market vendors and farm stands • Quick-service restaurants • Retail boutiques and pop-up shops • Service businesses (barbers, cleaners, tutors) • Anyone who runs a small business and is tired of paying 3-4% to a payment processor for software that locks them in.

HOW TAP TO PAY WORKS

Tap to Pay on iPhone uses Apple's built-in NFC to accept contactless payments directly on your iPhone XS or later. No card reader, no hardware, no Bluetooth puck. You hand the iPhone to the customer (or hold it out), they tap their card, phone, or watch — done. Powered by the Stripe Terminal SDK.

To accept card payments, you'll connect a Stripe account during setup. Stripe handles all the payment processing; OSPOS adds its 1% application fee on top of Stripe's standard rate.

To accept only cash, skip Stripe — OSPOS works completely offline with no signup required.

PRIVACY

Your cash transactions stay on your phone. They don't sync to any server. We don't see your menu, your customers, or your sales unless you explicitly send a receipt by email or text.

Your iPhone is the register, your Stripe account is yours, your data is yours. If we ever disappear, you keep running.

OSPOS is built and maintained by TTTS Co. LLC. Source code is available under AGPL-3.0 at github.com/pzapzap/ospos.

Send feedback to phil@tttships.co.