Compare Two Lists
Compare two lists and see items only in A, only in B, and in both. Browser-only.
Only in A (0)
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In both (0)
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Only in B (0)
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About Compare Two Lists
This tool takes two lists (one item per line) and produces a three-way breakdown: items only in the first list, items only in the second list, and items in both. It's the visual companion to the set-operation tools (list-union, list-intersection, list-difference).
When to use it
- Diffing two email lists or contact lists
- Comparing two inventories to find missing items
- Auditing two configs to see what changed at the line level
- Visualizing what's shared between two sets of tags or IDs
How it works
Both lists are split on LF/CRLF with blank lines removed. Sets are built from each. The three result lists are computed by single-pass membership checks. Case-sensitive comparison is optional.
Examples
A: apple, banana, cherry B: banana, cherry, date
Only A: apple Both: banana, cherry Only B: date
Frequently asked questions
- How does this differ from list-union/intersection/difference?
- Those tools each return one of the three buckets. This tool shows all three at once, which is more useful for visual comparison.
- Are duplicates within a list counted?
- No. Each item is counted once per list — the comparison is set-based.