I make Billpad , a browser-based tool for creating invoices, estimates, receipts and proforma invoices. It does not collect payments or send invoice emails. Working on a document tool brings up a smaller engineering problem that is easy to underestimate: the number in the editor must match the ...

Source: [Dev.to](https://dev.to/lei_zhang_b6e446ccf73eac3/five-calculation-and-pdf-pitfalls-in-a-browser-invoice-tool-46j4)

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