Every sale on your Square POS adjusts warehouse stock in real time. Nautilus bridges Square's point-of-sale catalog and your warehouse inventory for retailers with physical locations, mixed online/in-store, or pop-up operations.
Inventory data, where you need it.
Three things the Square integration does well, that you'd otherwise be doing by hand.
POS sync under 5 seconds
Square POS sales hit warehouse counts within 5 seconds. Useful for retailers running busy storefronts where overselling between morning and afternoon shifts is a real risk.
Bidirectional catalog
Add a product in Nautilus and it appears in Square. Add it in Square and it appears in Nautilus. Variations, modifiers, and pricing all sync. Useful for retail teams who do most catalog work in Square's POS interface.
Multi-location
Square locations map to Nautilus warehouses or sections. Each Square POS terminal pulls stock from the correct warehouse, and stock transfers between Nautilus locations reflect in Square's location-aware views.
Bidirectional sync. No manual entry.
Data moves between Nautilus and Square in both directions, near-real-time.
- Stock levels
- Cost basis
- Catalog updates
- Transfer movements
- POS sales
- Refunds
- Catalog edits
- Location settings
Four steps to live.
Under 10 minutes for most teams. The full health check takes longer but doesn't block sync.
Connect
Authenticate with one click. Nautilus uses OAuth — no API keys to copy, no credentials to store.
Map
Match your products, locations, and accounts. Nautilus auto-maps by SKU where possible.
Sync
Enable bidirectional sync. Changes in either system reflect in the other within 30 seconds.
Verify
Run the sync health check. Nautilus flags any mismatches before they become problems.
What the integration does, in numbers.
Square questions, answered.
Does this work with Square Online?
Yes. Square Online is one of Square's locations from Nautilus's perspective. Stock from Square Online sales decrements the warehouse the same way as in-store sales. Square Online and Square POS share inventory by design, so they share the same Nautilus mapping.
What about Square for Restaurants?
Supported, but the use case is narrow. Restaurants typically don't need warehouse-grade inventory management. The integration is most useful for restaurants with central kitchens that prep for multiple locations, or restaurants selling retail merchandise alongside food service.
How are modifiers handled?
Square modifiers (variants on a base item, like 'Coffee + Oat Milk') don't decrement modifier-specific inventory by default. If your modifiers track stock (a paid 'add an extra scoop' modifier), enable modifier inventory tracking during setup; Nautilus will treat each modifier as its own SKU.
Will Square's offline mode break the sync?
Square POS can run in offline mode (sales queue locally during network outages). When it reconnects, queued sales sync to the cloud, and Nautilus picks them up on the next webhook. Stock counts catch up automatically. No data loss; just brief delayed accuracy during the offline period.
See Nautilus + Square running on real data.
30-minute walkthrough with a Nautilus engineer. We'll connect a sandbox of your Square account and show the sync live.