Point-of-sale and store management for UK shops
CashBox runs UK convenience stores, supermarkets and pubs end to end: the till at the counter, a mobile console for owners, an app for staff, one web portal for head office and store owners, and the public website. Every till keeps selling through an internet outage and syncs back to the cloud when the connection returns.
Offline-first checkout for the counter
A Flutter till app built for low-spec Android POS hardware (Sunmi, iMin, Elo) as well as desktop. Sales, stock and prices read from a local SQLite database, so scanning, tendering and printing keep working with no internet. PowerSync replicates every change to Supabase Postgres in the background, scoped per store through JWT claims.
Used by Cashiers, supervisors and managers on dedicated POS terminals
Tills, the Admin App and the Staff App read a local SQLite copy and sync through PowerSync, scoped to each store by JWT claims. The portal talks to its own Express API over the same Postgres, so a price changed in the portal reaches every till on its next sync.