You can work offline with Billdu apps with some limitations:
You can create invoices, estimates and other documents
Documents won't get numbers automatically.
Numbers will be added later when the app is again online.
You can assign numbers manually. Edit the document and select Details. Don't forget to check the numbering settings after a manual adjustment when you're online again.Inventory, Orders, Store app and Appointments & Booking app work offline but some features (e.g. assigning team members) will not be available