What The Diff

What is What The Diff?

What The Diff is an AI code review assistant that reads your pull request diffs and writes plain-English descriptions of the changes. It also sends simplified summaries to non-technical teammates and can publish a changelog.

Key capabilities of What The Diff

• PR descriptions: generated automatically for each pull request.
• Summary notifications: simplified summaries sent by Slack, email or webhook.
• Weekly reports: combines a team's work into one weekly update.
• Inline refactoring: request code improvements through pull request comments.
• Public changelog: publishes a changelog with a JSON API.
• Granular controls: choose repositories, skip CI pull requests and delay drafts.

How What The Diff works

You connect your repositories on GitHub or GitLab, and What The Diff writes a description each time a pull request opens. Usage is token-based, with an average pull request using about 2,300 tokens. Summaries can go to Slack, email or webhooks, and refactoring requests are made in PR comments.

Who uses What The Diff?

What The Diff suits engineering teams who want consistent pull request descriptions and managers or product teams who want readable updates without reading diffs.

What The Diff pricing

Free is $0 per month with 25,000 tokens (about 10 pull requests), unlimited repositories and no credit card. Pro is $19 per month with 200,000 tokens (about 40 pull requests), instant code refactoring, Slack, webhook and email notifications, and priority email support. Larger token tiers of 500k, 1.5M and unlimited are also shown. Unused tokens do not roll over.

What The Diff alternatives

DeepWiki generates documentation and answers questions about a repository, so it explains code rather than describing each change. Qodo is a code quality and review tool that also generates tests. Sourcegraph Cody is a code assistant with codebase search and chat. What The Diff is narrower, focused on pull request descriptions and summaries.