Do you handle deposits and partial payments?
Yes — an invoice can be part-paid, and deposits are credited against the balance automatically with both movements posted to the ledger. Nothing has to be tracked alongside in a spreadsheet.
Is there a real ledger, or just a list of invoices?
There is a real double-entry ledger underneath. That matters because it makes the books balance by construction — a list of invoices can disagree with a bank account and never tell you.
Does this replace my accounting software?
It replaces the spreadsheet between your operations and your accountant, not necessarily your accountant’s software. Everything is readable over the API, so whoever does your books can pull exactly what they need on whatever schedule suits them.