What The Diff

What is What The Diff?

What The Diff reads the git diff of each pull request and writes a plain-English description of what changed, so reviewers see context before they open the code. You sign in with GitHub or GitLab, enable the repositories you want, and either drop shortcodes such as wtd:summary into a PR description or let the app post an AI comment when a PR is opened, updated or labeled. Beyond descriptions, it sends simplified PR notifications to Slack, email or webhooks, compiles a weekly progress report, turns selected PRs into a public changelog with a JSON feed, and suggests inline refactors when you comment with /wtd. Usage is metered in tokens per month, and the service says it does not store your code or train models on it. What The Diff pricing starts with a free plan of 25,000 tokens per month, and the Pro plan costs $19/month for 200,000 tokens.

Use cases

• Generate pull request descriptions automatically
• Summarize code changes for non-technical teammates
• Send PR notifications to Slack or email
• Produce a weekly report of merged work
• Publish a public changelog from PRs
• Request inline refactor suggestions

Who it's for

• Software developers
• Engineering managers
• Product teams
• Open-source maintainers

Why use What The Diff

• Reviewers get the what and the why up front, which cuts the time spent explaining each change by hand.
• Non-technical teammates can follow progress through simplified, translated summaries in Slack or email.
• Token caps per PR and file exclusion patterns keep costs predictable on large or noisy repositories.
• A free plan with no credit card lets you try it on your own pull requests first.
• The tool states that your code is not stored and is not used for model training.

What The Diff features

• Automated pull request descriptions from the diff
• wtd:summary, wtd:joke and wtd:poem description shortcodes
• AI comments on PR creation, update or label
• Slack, webhook and email notifications with translated summaries
• AI-written weekly progress report
• Public changelog with JSON feed
• Inline refactor suggestions through /wtd comments
• Per-repository settings, file exclude patterns and token limits per PR
• Support for GitHub and GitLab

What The Diff integrations

• GitHub
• GitLab
• Slack

How to get started with What The Diff

1. Sign in with GitHub or GitLab and authorize the organization you want to use.
2. Enable What The Diff on each repository from the dashboard and set its options.
3. Open a pull request as usual, adding a shortcode like wtd:summary or choosing a comment trigger.
4. The app reads the diff through the Git host API and an AI model writes the description or comment.
5. Share the result with your team through Slack, email, webhooks, weekly reports or the changelog.

What The Diff limitations

• Free plan includes 25,000 tokens per month, roughly 10 pull requests, and is rate limited
• Tokens left over at the end of a month are lost and do not carry into the next one
• Needs full repository access because GitHub and GitLab have no diff-only permission
• A GitHub login and a GitLab login need separate accounts
• Plans are not upgraded automatically when tokens run out

What The Diff pricing

Yes, What The Diff has a free plan. Paid plans start at $19 per month, according to the official pricing page on 24 Oct 2026.

What The Diff plans

• Free

  $0/month

  • 25,000 tokens per month (about 10 pull requests)
  • Unlimited repositories
  • Automated PR descriptions
  • Inline code refactoring
  • Rate limited

• Pro

  $19/month

  • 200,000 tokens per month (about 40 pull requests)
  • Unlimited repositories
  • Instant code refactoring
  • Slack, webhook and email notifications
  • Priority email support

Plans as listed on the official pricing page on 24 Oct 2026. Prices can change and may vary by country or exclude tax. Check the official pricing page.

What The Diff alternatives

The main What The Diff alternatives listed on Debuly are CodeRabbit, GitHub Copilot, Sourcery, Greptile, Code to Flowchart and OpenRabbit. The table compares pricing and platforms; order is A–Z.

1. 

   Code to Flowchart

   Paste code in any major language and get an editable flowchart, sequence or class diagram plus an AI explanation.

   CodingProductivityDesign
   FreemiumVisit Code to Flowchart (official site)
2. 

   CodeRabbit

   AI code review for pull requests, IDEs and the CLI, with pre-merge checks, one-click fixes, triage and security scans.

   CodingDeveloper platformsAutomation and agents
   FreemiumVisit CodeRabbit (official site)
3. 

   GitHub Copilot

   GitHub's AI coding assistant for code completion, chat and agents in VS Code, JetBrains, Visual Studio, the CLI and GitHub.com.

   CodingAutomation and agents
   FreemiumVisit GitHub Copilot (official site)
4. 

   Greptile

   AI pull request reviewer that maps your whole repository, so each review weighs the change against code outside the diff.

   CodingDeveloper platforms
   FreemiumVisit Greptile (official site)
5. OR

   OpenRabbit

   Free self-hosted GitHub pull request reviewer that runs in your own Actions and posts AI summaries and inline comments

   CodingAutomation and agentsDeveloper platforms
   Open sourceVisit OpenRabbit (official site)
6. 

   Sourcery

   AI code review for GitHub and GitLab pull requests with summaries, suggested fixes and security scanning, free on public repositories.

   CodingDeveloper platformsAutomation and agents
   FreemiumVisit Sourcery (official site)

What The Diff FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Image credits

• Logo: from whatthediff.ai · fetched 24 Oct 2026 · Vendor trademark, used only to identify the product; removed on request
• Cover: none collected yet, so a generated tile is shown.

Spot an error? Report an issue with this listing. We also remove a logo or image on the owner's request.