Clean, sort & dedupe huge lists — fast, offline, private.

Listalyze is a local-first power tool for lists and text. Paste or open a file, run the operation, copy the result. Your data never leaves your machine.

Sort, clean & dedupe — order lines, trim whitespace, drop blanks and remove duplicates in one pass.
Regex & find — extract or replace with regular expressions, and search across the whole list.
Compare lists — diff List A against List B to find what's shared, added or missing.
Huge files, offline — work on big lists with no upload, no account and no network round-trip.

Deduplicate 1,000,000 emails in ~1.2 s — on your machine, nothing uploaded.