The open commerce platform

Don't get boxed in.

The open POS for modern merchants. Run on the devices you want, keep the payment processor you choose, and manage retail and food operations in one place — with no lock-in.

Start using Rhombus Become a partner

No contracts $0 setup Live in 72 hours 24/7 human support

Rhombus POS running on a PAX payment terminal

See it in action

Ninety seconds. The whole platform.

Watch on its own page

The difference

Most POS systems quietly box you in.

You get locked to one company's hardware, one processor, and a long contract. The day you want to leave, you find out leaving is expensive — so you stay, not because it's good, but because you're stuck. Rhombus is built the other way.

The box

Their hardware — buy what they sell
Their processor — one option, their rate
Long contracts and early-termination fees
Leaving is expensive by design

The merchant quietly becomes the product.

The open door

Almost any device — including hardware you own
Almost any processor — you choose, you keep it
Month-to-month. No lock-in
The door is always open

You stay because it works — not because you're stuck.

One device

Your POS and your payments — together.

The old way: a POS station over here, a separate card reader over there, and a locked-in contract holding it together. Rhombus puts it all into one device — your point of sale, your payments, and the processor you choose — on hardware most businesses already have. The moment a card is tapped, Rhombus steps out of the way. Your processor handles the money — never us.

PAX A800

Countertop · all-in-one

PAX A920 Max

Smart handheld · go anywhere

PAX Elys

Sleek tap-to-pay terminal

Runs natively on the PAX Android terminals you already deploy — no new hardware, no new certifications.

Built for your business

Built for how you actually work.

One flexible platform that handles retail and food operations — and everything in between.

Cafés, bakeries, wineries

Everything included

One platform. Every tool you need.

Inventory management

Track stock in real time

Customer management

Profiles, history, loyalty

Kitchen Display

Orders straight to the line

Online Ordering

Your storefront, your brand

Timekeeping

Clock-in & labor tracking

Gift Cards

Physical & digital

Multi-location

One dashboard, every store

Advanced analytics

Know what's selling

Mobile Payments

Take payment anywhere

B2B invoicing

Bill accounts with terms

Offline mode

Keep selling if wifi drops

Hardware-agnostic

iOS, Android & Windows

For ISOs, agents & processors

Put your name on a modern POS.

Stop reselling someone else's software on rate alone. White-label Rhombus for your merchant book — your brand on every screen, a new revenue line beyond processing, and merchants who stick.

Processor-agnostic — one POS that follows the merchant across any of your sponsor banks
Card data kept out of scope — lower PCI and breach exposure
Runs on the PAX terminals you already ship — no new hardware
Your brand, your markup, your customer relationship

Explore the partner program

Your brand.

Not ours.

HardwareAny PAX Android device

ProcessorAny — merchant's choice

Lock-inNone

Card dataOut of scope

RevenueNew line beyond processing

Pricing

Simple, month-to-month pricing.

No contracts. $0 setup fees. 100% data migration. Cancel anytime.

Starter

$49/mo

Core POS
Basic reporting
One location
24/7 human support

Get started

Growth

$89/mo

Everything in Starter
Inventory management
Customer & employee tools
Online ordering ready

Get started

Built for you — not about us.

Every merchant deserves tools that are dependable, affordable, and simple to run. Rhombus keeps you in control of your business — your hardware, your processor, your earnings — so you can grow on your own terms, without limits.

Founder Michael Hogan is an engineer with decades of critical-infrastructure experience, where the first rule is that nothing depends on a single point of failure. He built Rhombus on that same principle: an open platform with no proprietary hardware, no forced leasing, and no lock-in.

That's why we treat merchants as partners, not transactions. One platform runs restaurant and retail without forcing complexity, and every payment processor is a partner — not a competitor. Fair, transparent, and built for the long term.

Michael Hogan · Founder & CEO, Rhombus POS

Let's get you out of the box.

Switch in 72 hours with $0 setup and 100% data migration — or put your own name on it.

Start using Rhombus Talk to us

support@rhombuspos.com · mph@rhombuspos.com · +1 805 387 5615