Comparelists.org – Instantly Compare Two Lists, Find Differences
Hey HN, I got tired of manually comparing two lists (think: emails, product SKUs, code, whatever) and built CompareLists.org to make it painless. You just paste your two lists, hit compare, and instantly see what’s unique to each list, what matches, and any duplicates. It handles thousands of lines, works right in your browser (no data leaves your device), and you can export results as CSV/TXT/JSON. There are options for case sensitivity, whitespace, and more. It’s free and there’s no signup. I’d love for you to try it out and let me know what you think—or if there’s a feature you…
In plain words
Comparelists.org is a free browser-based tool for identifying differences between two lists of any size. Users paste their lists, click compare, and instantly see which items are unique to each list, which match, and which are duplicated. The tool processes data locally without uploading it, handles thousands of lines, and offers export options in CSV, TXT, or JSON formats. Additional features include case sensitivity and whitespace controls. No signup is required.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hey HN, I got tired of manually comparing two lists (think: emails, product SKUs, code, whatever) and built CompareLists.org to make it painless. You just paste your two lists, hit compare, and instantly see what’s unique to each list, what matches, and any duplicates. It handles thousands of lines, works right in your browser (no data leaves your device), and you can export results as CSV/TXT/JSON. There are options for case sensitivity, whitespace, and more. It’s free and there’s no signup. I’d love for you to try it out and let me know what you think—or if there’s a feature you wish it had. Feedback (and bug reports) super welcome! Thanks!
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