CompareLists - Compare Two Lists

Compare two lists online and find differences, common items, and unique values instantly.

Compare two lists without leaving your browser CompareLists is a small, fast toolbar tool for comparing two lists and seeing exactly what's shared and what's different. Paste your lists, hit compare, and you get three panels: what's only in List A, what's only in List B, and what's in both. No tab-switching, no exporting to a spreadsheet just to eyeball the differences. Full tool and docs: https://comparelists.io It's built for the boring-but-constant stuff: checking two email lists for overlap, diffing spreadsheet columns, comparing database IDs, finding duplicates, or figuring out who unfollowed you on Instagram. What it does Three result panels at once: Only in A, Only in B, and Shared Split lists by newline, comma, tab, semicolon, pipe, or your own regex Case-sensitivity toggle, auto-trim, blank-line skipping, and dedupe Add prefixes/suffixes, switch casing, or show how many times each item appears Live search to filter results as you type One-click copy, or export to .txt / .csv Right-click any selected text on a page and send it straight to List A or List B Light and dark themes that follow your system Shortcuts: Ctrl+Enter to compare, Alt+A / Alt+B to jump to an input, Esc to close Runs entirely offline Everything happens locally in your browser. There's no server involved, so your lists are never uploaded, stored, or logged. No account, no signup.