diffesq.

Compare two contract versions — without uploading them

To see what changed between two contract drafts, drop both .docx files into Diffesq: you get a synchronized side-by-side view and a consolidated redline of every insertion, deletion, and formatting change — computed entirely on your device.

Confidentiality is the point: there is no upload step, no server copy, and no account. The counterparty's paper never touches a third-party service.

Redline two drafts now

How it works

  1. Drop the two contract versions (.docx) into the workbench.
  2. Diffesq compares them structurally — clauses, tables, numbering, formatting.
  3. Read the consolidated redline, or step change-by-change with the change panel and structure map.
  4. Export an HTML or PDF comparison report (Pro), generated locally, for the file.

Built for document review

  • Redlines work even when nobody turned on tracked changes — the comparison is computed from the two files themselves.
  • Documents that already contain tracked revisions compare in their original, pre-revision state, with a notice — existing edits aren't double-reported.
  • Tables, numbering, headers/footers, and formatting changes are compared as such.
  • Diffesq compares and reports only — it never edits, merges, or writes to your documents.

Free vs Pro

Structured-file comparisons run in full on your device on the free tier, with about a third of the results shown as a preview; Pro unlocks the complete results and clean, unwatermarked exports (HTML, Markdown, JSON, PDF).

See Pricing for plans — $2.97/month, $27.99/year, or $49 once.

Privacy

Every comparison runs locally in your browser. Your files are never uploaded — there is no server that receives them, and the page keeps working with Wi-Fi turned off. Details in the Privacy Policy.

Frequently asked questions

Is this suitable for privileged or confidential documents?

The comparison runs on your device and the files are never transmitted — an automated test suite fails the build if any network request carries file content or names. Review your own organization's tooling policies as needed.

Does it replace Word's Compare feature?

For reviewing what changed between two drafts, yes — in the browser, nothing installed. It doesn't do accept/reject editing inside the document; it produces comparison views and reports.

Do I need an account?

No. Comparisons run without any signup. Pro features unlock with a license key — still no account or login.

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