Compare two lists and instantly see what's only in A, only in B, and shared by both. Built-in templates for Instagram followers, Excel/CSV columns, database IDs, and inventory lists. 100% client-side; nothing you paste is ever uploaded, no login required. Works offline, has a Chrome extension, and includes a visual diff, regex splitting, and find & replace. Free, no signup.

Hey Product Hunt 👋 I built CompareLists after one too many VLOOKUP detours in Excel just to figure out what changed between two versions of a list. What started as a quick personal script turned into a proper tool once I realized most "list comparison" sites out there either make you sign up, upload your data to their server, or both, which felt like overkill (and a privacy risk) for something this simple. So CompareLists runs 100% in your browser. Nothing you paste or upload ever touches a server. It works offline, has a Chrome extension for comparing lists without leaving your tab, and includes ready-made templates for common cases, Instagram followers, Excel/CSV columns, database IDs, email lists. Some things I'm proud of under the hood: a visual diff view, regex-based splitting/find-and-replace, and a share-link feature if you need to send results to someone else. Would love your feedback, especially on what other templates or comparison types would be useful. What do you usually end up comparing manually that you wish was instant? Thanks for checking it out! 🙏

Love that this runs 100% client-side; huge plus for data privacy when dealing with internal IDs or client exports. Firing up a spreadsheet just to do a basic diff gets tedious fast. Clean UI too. Congrats on the launch!

Compare Lists

Compare two lists instantly. Private, offline, free.

Compare two lists instantly. Private, offline, free.