posOpen

Open, offline‑first Point‑of‑Sale software

posOpen is a modular POS platform designed for small businesses and emerging markets. It runs reliably offline, avoids vendor lock‑in, and stays simple where it matters most.

View on GitHub How it works

Why posOpen exists

Most POS systems are:

  • Vendor‑locked
  • Over‑engineered
  • Cloud‑dependent
  • Expensive to leave

posOpen is different.

It is a platform, not a monolith — built so merchants can own their system, developers can extend it cleanly, and operators can run offline without fear.

Core principles

Open standards

No proprietary silos. APIs first, data always accessible.

Offline‑first by design

Offline is a first‑class state, not a fallback mode.

Configuration over custom code

Adapt without rewrites. Replace parts without breaking the system.

Reliability beats cleverness

Daily operations matter more than theoretical elegance.

MVP functional scope

Core POS

  • Products & pricing
  • Sales transactions
  • Tax / VAT handling
  • Digital & printable receipts

Inventory

  • Stock tracking
  • Manual adjustments
  • Low‑stock alerts

Payments

  • Cash handling
  • Provider‑agnostic gateways
  • Transaction reconciliation

Reporting

  • Daily sales summaries
  • Cash‑up reports
  • Exportable CSV / JSON

Offline‑first architecture

  • Transactions work offline
  • Receipts print immediately
  • Data syncs when connectivity returns
  • Conflicts are auditable, not silent

Offline is not an edge case. It is assumed.