Real SumUp card payments require a backend server to keep the API key secret. Everything else — cash checkout, card simulation, product management, order history, analytics, CSV export, and backup/restore — works fully offline.

All data lives in this browser's IndexedDB. Clearing browser data wipes it. Back up regularly using the button above.

Slop POS — single-file edition
Zero dependencies · Runs from any browser · Persists in IndexedDB

Quick tips: Tap a product to add one. Use the ± controls on the card to adjust without leaving the grid. Tap the number in the middle to type an exact quantity. Long-press any card for a quantity dialog.