Best Open Source POS Systems (2027)

Payments are where Odoo separates itself from the rest of this page. It is the only system here with named card terminal modules: Adyen, Stripe, Mercado Pago, Razorpay and Viva.com. The other three name either nothing or something confirmed only in source code. For a business that needs card payments working on day one rather than as a project, that gap is the whole decision.

Two things are unresolved. Odoo's pricing page does not say whether its paid plans run Community, so you cannot tell from public information whether the $31.10 per user per month Standard plan gives you the open-source edition or the proprietary one. And support for self-hosted Community is not stated. Ask both questions before you budget, because a per-user plan at $31.10 scales very differently from a flat self-hosted install.

Pricing: free self-hosted. Odoo Standard $31.10 per user per month on a 12-month discount, $38.90 full price.

For a shop that wants source access and the right to leave, without a server to patch, that combination is unusual. You get the GPL-3.0 code and someone else handles uptime.

Two caveats. The Docker quick start is for evaluation only, so do not mistake a working demo for a production deployment path. More seriously, the POS documentation names no card terminal integration at all. On a page where Odoo lists five processors, that absence is the deciding weakness. Confirm how you will take cards before committing, because we will integrate it later is a development project with a PCI scope attached.

Pricing: free self-hosted. Frappe Cloud sites from $5/mo.

A Windows client is sold through the NexoPOS marketplace, which matters if your counter runs Windows rather than a browser. The free Windows version watermarks receipts, so budget for the paid client if you hand receipts to customers.

The gaps are payments and support, and both are significant. No payment integrations are named at all, meaning card processing is something you build or bolt on yourself, with the PCI scope that implies. Cloud prices are not shown. No support position is stated. Read NexoPOS as the right answer when you have developers and the wrong one when you do not.

Pricing: free self-hosted. NexoPOS Cloud price not stated.

Hosting comes through partners who each set their own prices, so there is no single figure to quote and no published entry point. That is workable if you want a local partner who knows your setup, and it means you cannot compare the cost against Frappe Cloud's $5 per month without a conversation first.

Two gaps worth resolving before deployment. The card terminal settings for Stripe Terminal and SumUp are confirmed only in the source code, not in documentation, which means the integration may work but is not vendor-supported in any way you could rely on. And no license identifier or release date appears in this brief, so verify both against the project repository yourself.

Pricing: free self-hosted. Partner hosting priced by each partner.