Compare Two Lists Online
Compare two lists online and find only-in-A, common, only-in-B, union, symmetric difference, duplicate-aware counts, and CSV/JSON exports.
List diff for matches and differences
Paste two lists of emails, IDs, URLs, keywords, SKUs, names, tags, or rows and compare them in the browser.
- Find items only in A, common to both lists, and only in B.
- Switch to version terminology for deleted, unchanged, and added rows.
- Use set mode when duplicates should count once, or multiset mode when repeated items matter.
- Inspect all differences, Jaccard similarity, and a summary table.
- Copy sections or export TXT, CSV, and JSON.
Set operations
| Operation | Meaning |
|---|---|
| Intersection | Items that appear in both lists |
| Only in A | Items missing from list B |
| Only in B | Items missing from list A |
| Union | Every distinct item across both lists |
| Symmetric difference | Everything that appears in exactly one list |
J is the Jaccard similarity score for the normalized lists.
Privacy and parsing limits
The comparison runs in the browser tab. The tool treats rows as plain text and does not fuzzy-match names, validate emails, or parse complex quoted CSV.
Frequently Asked Questions
Sources and References
Calculations are based on the listed reference sources. Links open in a new tab.
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