List Comparator
Paste two lists, one item per line, to see what's common to both and what's unique to each.
In both lists (2)
Only in A (1)
Only in B (1)
Comparison is line by line. Empty lines are ignored.
How to compare two lists
Paste two lists, one item per line, to see what's common to both and what's unique to each.
How comparison works
Each list is treated as a set: item order and repeated lines don't affect the result. Empty lines are ignored.
Common uses
- Compare two exported lists of usernames, emails, or IDs.
- Check what changed between two versions of a list.
Limitations
Comparison is exact, item by item — it won't catch near-matches like extra whitespace inside an item or minor typos between otherwise-similar entries.
Calculation notes
All comparison runs in your browser; the lists you paste are never sent anywhere.
FAQ
Does it care about uppercase and lowercase?
By default, yes — "Apple" and "apple" are treated as different items. Turn on case-insensitive comparison to treat them as the same.
What happens to duplicate lines within one list?
They're treated as a single item, since each list is compared as a set.
Can I compare more than two lists at once?
Not directly — compare two at a time, or run the tool again using one list's "only in A"/"only in B" output as a new input.