Not every invoice is an e-invoice. With Start, your focus is on e-invoicing, while with Smart, you also include PDFs and receipts. You can always switch later on (if you use accountancy firm software, coordinate this with your accountant).
Fair usage in Start: Start has a total fair usage of 250 documents (incoming and outgoing combined). With higher volumes, Smart is recommended.
Bank link (read-only): OkiOki can only consult your bank account. We do not make any payments. We only read transactions. The bank link is the same with both Start and Smart.