Mathproven

Mathproven is a set of single-purpose paperwork tools for people who do the same calculation every month and need it to be right: construction subcontractors, medical billers, property managers, law firms, insurance agencies, bookkeepers, online sellers, nonprofits, truckers, and people working out crypto gains.

Every tool runs entirely in your browser. A file you open is read on your own device and is never uploaded; the medical billing pages cannot make a network request at all and keep working offline.

Every result comes with a certificate: the list of arithmetic checks it passed, such as "line items add up to the total" or "opening balance plus activity equals closing balance". A result that fails a check is marked not verified and is never presented as correct.

Free to use for three runs a month per tool. Paid plans remove the limit. Free Excel templates need no account. The tools calculate and check; they do not give legal, tax, or medical advice.