How to use Listalyze
Listalyze is a list and text power tool that runs in your browser. You paste or open a list, run an operation, and copy the result. Your data stays on your machine — nothing is uploaded.
This page is the map. Each section is one thing the tool does, with a one-line how-to and a link to try it.
Sort
Order lines alphabetically, numerically, or naturally (so item2 comes before
item10).
How: paste your list, pick a sort, copy the result. Sort a list →
Clean
Trim whitespace, drop blank lines, and tidy messy exports in one pass.
How: paste the list and apply the clean operations you need. Clean a list →
Dedupe
Remove duplicate lines — including case and whitespace variants, with normalized matching.
How: paste the list and run dedupe; near-duplicates collapse to one. Dedupe a list →
If you are working with emails specifically, start with the flagship guide: remove duplicate emails from a list.
Regex and find
Extract or replace text with regular expressions, and search across the whole list.
How: enter a pattern to extract matches or find-and-replace across every line. Use regex →
Compare
Diff List A against List B to see what is shared, what was added, and what is missing.
How: load two lists and read the only-in-A, union, intersection and diff views. Compare two lists →
Big files, offline
Process lists that are too large for a spreadsheet, without uploading them. Because the work runs locally, it keeps going offline once the app has loaded — and it is fast: deduplicating 1,000,000 emails takes about 1.16 seconds on a test machine.
How: open a large file and run your operations as usual. Open a big list →
For why local-first matters when the data is sensitive, see Security & your data.
Where to go next
- The flagship guide: remove duplicate emails from a list
- Security & your data — how your lists stay private
- Open the app and run your first operation