Two exports should not take hours of spreadsheet formulas to compare. I build a small Python script for your specific headers and matching rule. Run it on your own computer to see matching records, missing rows on either side, duplicate or blank keys, and differences in up to three fields.

The US$119 fixed package covers two comma-delimited UTF-8 CSV files, each up to 10,000 rows and 20 columns, with one stable matching key and up to three field mappings. You receive a Python 3.11+ command-line script, run guide, tests, and synthetic sample output. Delivery is within 48 hours after we agree on anonymized sample rows and mappings. One correction round for the agreed behavior is included within seven days.

Send anonymized header lines and 5–20 representative invented rows from each export. Replace names, emails, account numbers, and other sensitive values. Your live data can stay on your computer. The script never changes source files.

Outside this fixed scope: XLSX, more than two sources, databases or APIs, cloud deployment, scheduling, sensitive or regulated live data, and inventing business rules without examples. I will confirm fit before purchase. AI assists implementation; the agreed samples and tests are run before delivery.

Original sample and tests: https://github.com/asphyxeth-tech/csv-reconcile-demo