CheckDiffs

Paste before & after — see what an AI rewrite actually changed. CheckDiffs is a free, in-browser side-by-side diff (Monaco). Built for vibe-coding and long chat refactors: jump hunks, merge lines, no account for basic compare, nothing uploaded for that flow. Not a PDF/Excel suite. Not “better than VS Code.” Just a simple standalone clipboard moment. Try it: https://checkdiffs.com Privacy: https://checkdiffs.com/privacy