Internet connectivity is not guaranteed. ISP outages, router failures, weather events, and even simple Wi-Fi issues can take your POS offline. When that happens, you have two options: stop selling or keep going.
The Cost of Downtime
For a busy retail store or restaurant, even 30 minutes of POS downtime can mean thousands in lost revenue, frustrated customers, and damaged reputation. Multiply that by multiple outages per year, and the cost is significant.
How Offline POS Works
A proper offline POS maintains a local copy of your product catalog, prices, and customer data in a local database (like SQLite). When the internet drops, sales are processed against this local data. Transactions are queued and synced back to the server when connectivity returns.
- Products and prices cached locally
- Sales processed against local database
- Transactions queued for sync
- Automatic sync when connectivity returns
- Conflict resolution for any discrepancies
- Visual indicator showing sync status
What to Look For
Not all "offline modes" are created equal. Some POS systems only cache a few recent products. Others lose cart data when connectivity drops. A true offline POS should handle your full catalog, process complete transactions including payments, and sync reliably without data loss.
PosStar uses SQLite for local storage on desktop (via Tauri) and IndexedDB for web browsers. Both provide fast, reliable local data access. The sync engine uses a queue-based approach with conflict resolution: server wins for product data (prices may have changed), client wins for completed sales (they are immutable records).
In a world where internet reliability varies widely, offline capability is not a luxury — it is a necessity. Your POS should never be the reason you cannot make a sale.