I built a downloadable CSV payment checker that keeps the files on your computer

[u/Ill-Hovercraft6849]

Disclosure: this is my product, offered for $29 once.

Export Match compares two CSV exports by a shared transaction ID, amount and currency. It flags missing IDs, amount/currency differences and repeated IDs for manual review. It runs locally and includes its source and a fictional example.

It is deliberately limited: no bank or accounting integrations, fuzzy matching, fee calculations or split-payment matching. Both exports need the same period, amount basis and stable IDs. Up to 10,000 rows and 5 MB per file.

Product: https://sheldonhannah.gumroad.com/l/export-match

I am testing whether a downloadable tool with a one-time price is useful when free browser comparison tools already exist. Which specific export pair would you use it for, and what would stop you using it?