loot.tools

List Comparer

Paste two lists (one item per line) and instantly see which items they share, which are unique to each list, and the merged set of everything. Toggle case sensitivity, whitespace trimming, blank-line handling, and alphabetical sorting. Runs entirely in your browser - nothing is uploaded.
Text

Paste two lists (one item per line) and see what they share and where they differ. Items in both, only in A, only in B, plus a merged unique list.

List A
List B

What this tool does

It treats each list as a set of items - one per line - and works out the overlap. You get four results: items in both lists, items only in list A, items only in list B, and the combined set of every distinct item. This is a set comparison, not a line-by-line diff, so order doesn't matter and duplicates within a list collapse to one.

How to use it

Paste one list into A and the other into B, one item per line. The results update as you type. Turn on 'Case sensitive' to treat 'Apple' and 'apple' as different items. 'Trim whitespace' ignores leading and trailing spaces when matching. 'Ignore blank lines' drops empty rows so stray newlines don't count. 'Sort results' returns each list alphabetically instead of in input order. Each result block shows a count and a copy button.

Common use cases

  • Finding which user IDs or emails appear in two exports
  • Diffing a list of installed packages against a required list
  • Checking which feature flags two environments have in common
  • Spotting items added or removed between two versions of a list
  • Building a deduplicated master list from two sources