Compare Two Lists compares two pasted lists or imported spreadsheet columns and shows values only in A, only in B, or in both. Cleanup options include trim, ignore case, skip blanks, find and replace, and regex. It imports TXT, CSV (UTF-8 only) and XLSX, one column at a time, up to about 5.2 MB and 100,000 rows per list.
No sign-up is needed, and the site states no pricing. Comparison and file reading happen in your browser, and lists are not sent to or saved by the tool. Results export by copy or as XLSX, CSV or TXT. Analytics and hosting logs are handled separately under the site's privacy policy.
Spreadsheet users still compare columns by eye or with fragile formulas. Compare Two Lists is a simple browser utility for checking two lists without an account.