Diffchecker alternative for private before/after compare
CheckDiffs is a lightweight Diffchecker alternative built for one job: paste the before version on the left and the after on the right, then review text or code side-by-side in your browser. Monaco Diff Editor, nothing uploaded for basic compare, no account wall, free forever for that core flow.
Diffchecker is a broader product with more formats and Pro tooling. We do not claim parity on every format. We compete on private Monaco editing, no-upload basic compare, honest free scope, and interactive jump/merge — not a feature laundry list. Built by FT — see About.
Try CheckDiffs freeWhat CheckDiffs wins on
- Private by default — basic side-by-side runs in your browser; your paste is not uploaded for that flow.
- Interactive Monaco — jump between hunks and merge what you accept, closer to an IDE than a static highlight dump.
- Honest free — basic text/code before/after stays free forever, no account. Pro ideas (export, ads-free, share links) are TBD — no fake checkout.
- Paste-first focus — text and code only. Articles, configs, JSON, teammate edits, or a rewrite from ChatGPT / Claude / Cursor when that is the job.
When a broader suite still wins
You need PDF or image compare, shareable history links today, or a multi-format document workflow. That is a different product shape — and saying so is more useful than pretending we cover everything. Reviewing an AI rewrite specifically? AI code diff. General free before/after: free diff checker.
FAQ
Should I switch from Diffchecker?
Only if your needs match ours: paste-first text/code before and after, client-side privacy, Monaco jump/merge, and an honest free tier. If you rely on PDF/image compare or share history today, stay on a broader suite — or use both for different jobs.
Is CheckDiffs really private?
Basic side-by-side runs in the browser; we do not upload your paste for that flow. Verify in DevTools → Network. Full details on Privacy.
Do I need an account?
No. Open checkdiffs.com, paste before on the left and after on the right, compare.
Paste both sides at checkdiffs.com— free basic side-by-side, nothing uploaded.