Compare two lists
Paste two lists into the boxes above and click Compare. You'll instantly see three things: items only in the first list, items only in the second, and items that appear in both. That's really all there is to it.
I built this because I kept doing this manually in spreadsheets and it was tedious. Works offline, no account needed, nothing ever leaves your browser.
How to Compare Lists and Find Differences
- All three result boxes appear at the same time - you don't have to switch between tabs or views
- By default it splits on line breaks, but you can switch to comma, tab, semicolon, pipe, or write a regex
- There's a trim option that strips leading/trailing whitespace, which saves a lot of headaches with copy-pasted data
- You can add a prefix or suffix to the output, or force everything to lowercase - handy for cleaning up SQL lists
- The side-by-side diff view highlights exactly which lines changed, useful when you're debugging config files or ID lists
Frequently Asked Questions About Comparing Lists
Select your first column in Excel or Sheets, copy it, paste into List A. Do the same for the second column into List B. The delimiter is already set to Line Break so you're good to go.
Paste the first list into A, second into B. Turn off Case Sensitive (email addresses are case-insensitive). The In Both box gives you the shared addresses.
Use the 📷 Instagram template to load some sample data. Then paste the accounts you follow into List A and your actual followers into List B. Whatever shows up in Only in A is who isn't following you back.
No. Everything runs locally in your browser tab. I don't have a server receiving your lists - there's nothing to send.
Yes. Open the Delimiter dropdown and switch it to Comma. Same goes for tab-separated, semicolons, pipes, or whatever weird format your data is in - there's even a Custom Regex option if you need something specific.