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
