Comparing two tag lists
List A: Apple, Banana, Cherry, Apple · List B: banana, Date, cherry
Only in A: Apple · Only in B: Date · Intersection: Banana, Cherry · List A duplicates: Apple.
List Compare
Compare two lists line by line — find what's only in each, their intersection, union and duplicates.
Only in A (0)
Nothing here.
Only in B (0)
Nothing here.
Intersection (0)
Nothing here.
Union (0)
Nothing here.
A's duplicates (0)
Nothing here.
B's duplicates (0)
Nothing here.
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About this tool
Two spreadsheet exports, two versions of an allow-list, an old and a new set of tags — comparing them line by line by eye doesn't scale past a handful of entries. This computes what's only in each list, what they share, and what each list itself repeats.
How to use it
- Paste List A and List B, one item per line.
- Toggle trimming, case-insensitivity and blank-line handling to match how the lists should be compared.
- Read off only-in-A, only-in-B, the shared intersection, the combined union, and each list's own duplicates.
Examples
Common problems
- Two entries that look identical end up in both "only in A" and "only in B".
- They likely differ in whitespace or case — turn on trimming and case-insensitivity, which are off by default for exact-match comparisons, to treat near-identical entries as the same.