Open source · MIT · Python 3.10+

Policy changes,
reviewed like code.

GovernDiff finds changes to duties, scope, deadlines, exceptions, and authority across PDF, DOCX, HTML, Markdown, and text—locally, deterministically, and with evidence a person can verify.

把政策文件当代码审查：不上传文档，不依赖大模型。

Open the synthetic demo Install from PyPI Use the GitHub Action

No document upload
No telemetry
No LLM required

Before

Incident notification

Vendors may report a security incident within 72 hours.

After

Incident notification

Vendors must report a security incident within 24 hours.

modality-strengthened deadline-shortened

CI gate blocked2 high-confidence findings

5input formats

15explicit checks

4report formats

0network calls in AI-off flow

See the result first

A line diff shows words.
GovernDiff shows what changed.

Every finding carries its source evidence, confidence reasons, severity, review state, and a stable fingerprint for CI and waivers.

Normative force

may became must. GovernDiff marks the obligation as strengthened instead of leaving the reviewer to infer it from colored text.

Deadline pressure

72 hours became 24 hours. The value pair and aligned source sentence remain attached to the finding.

Review continuity

A stable GVD-* fingerprint connects the CLI, pull-request gate, local Reviewer, exported decision log, and future waiver.

One evidence chain

Compare. Decide. Gate.

1
Compare locally
Parse digital PDF, DOCX, HTML, Markdown, or text. Align clauses through moves, splits, and merges.
2
Review the evidence
Confirm, reject, modify, or waive findings in the packaged loopback-only Reviewer.
3
Protect the pull request
Block configured changes while retaining complete JSON, Markdown, HTML, and CSV artifacts.

GovernDiff Reviewer showing a queue, side-by-side source evidence, findings, and review controls — The Reviewer keeps machine values, human decisions, source evidence, and portable review state together.

Built for review, not spectacle

Why not ordinary document diff?

Capability	Plain diff	Generic LLM	GovernDiff
Clause moves, splits, and merges	Line-level	Prompt-dependent	Deterministic alignment
Before/after source evidence	Text context	Often summarized	Page, paragraph, cell, or line
Stable finding identity	—	—	`GVD-*` fingerprints
Reproducible AI-off output	Raw diff only	No	Yes
Policy text remains local	Usually	Often uploaded	Yes; no telemetry
Portable reviewer decisions	—	Service-specific	`governdiff-review/1.1`

Five-minute path

Compare two local policy files.

Install the published package from PyPI and generate a self-contained HTML report. Your policy text stays on the machine.

Read the full documentation →

terminal

$ python -m pip install governdiff

$ governdiff diff \
  old-policy.md \
  new-policy.md \
  --format html --output report.html

✓ 1 change · 2 findings · evidence retained

Deliberate boundaries

Evidence for a person—not a legal conclusion.

Breaking is a deterministic review cue, not legal advice or a compliance determination.
Digital-text inputs only; image-only PDFs are diagnosed and OCR is not performed.
No accounts, hosted document processing, telemetry, remote AI, or public Reviewer service.
All examples, reports, screenshots, and performance fixtures on this site are synthetic.

Policy CI, without the upload

Make the important change
impossible to miss.

View GovernDiff on GitHub Read the engineering story Inspect the evidence

Policy changes,reviewed like code.

A line diff shows words.GovernDiff shows what changed.