Free tools
No signup. No email wall. The real engine.
These aren't lead-magnet toys: each tool runs the same TypeScript engine that powers Duebay and its API, loaded into the page and executed client-side. No account, no upload, and the numbers you type never leave your browser, which you can verify in the network tab.
Late fee calculator
Balance, due date, your agreed terms and your state in; the fee out, derived line by line, with the state statute and citation alongside. If nothing was agreed, it tells you so instead of inventing a charge.
Backed by the 50-state statute library
DSO calculator
Receivables, credit sales and a period in; Days Sales Outstanding out, with the formula shown and an honest reading against your terms. Zero credit sales reads undefined, never a fake zero.
Plus what counts as a good DSO
Aging report generator
Paste or upload an invoice CSV and get the classic aging report: buckets from current to 90+, totals, the largest overdue balance flagged, and a downloadable CSV of the result.
Your file never uploads anywhere
When the tools show a problem, the product fixes it
An aging report full of 60+ day balances is a chasing problem. Duebay puts every one on an escalating sequence.