Last updated 08-09-2026
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What The Diff
What The Diff plugs into GitHub or GitLab and reads your pull request diffs to write descriptions, send stakeholder-friendly summaries, and suggest inline code refactors. You connect your account, and the assistant drafts PR comments from the actual code changes so reviewers spend less time decoding what changed.
Most AI code tools focus on writing new code inside your editor. What The Diff sits on the review workflow instead, turning diffs into plain-language updates for non-technical teammates, weekly progress reports, and public changelogs with a JSON feed. Reviewers can also comment with /wtd on specific lines to get one-click refactor suggestions rather than back-and-forth comment threads.
It fits engineering teams that want faster reviews without losing visibility for product managers or founders who do not read diffs daily. The pricing page says average pull requests use about 2,300 tokens, and the free tier covers roughly 10 PRs per month with unlimited repositories.
Free plan includes 25,000 tokens per month, roughly 10 pull requests at ~2,300 tokens each
Pro plan at $19 per month raises the limit to 200,000 tokens (~40 PRs)
Inline refactoring via /wtd comments with one-click accept in the pull request
Notifications through Slack, email, or custom webhooks with AI summaries
Public changelogs plus a JSON API feed generated from selected pull requests
Free tier covers about 10 pull requests per month with unlimited repositories
Translates technical diffs into summaries for non-technical stakeholders
/wtd inline refactoring cuts reviewer back-and-forth on small fixes
Does not store code or train models on your diffs, per the pricing FAQ
Requires broad GitHub or GitLab repo access because neither API exposes diff-only permissions
Unused tokens do not roll over to the next billing month
Free plan is rate limited and caps refactoring to inline mode rather than instant
What does What The Diff do?
What The Diff is an AI app that reads the git diff of your pull requests and writes descriptive comments in plain English. It also powers summary notifications, weekly reports, changelogs, and inline refactor suggestions for GitHub and GitLab repos.
How much does What The Diff cost?
What The Diff offers a free plan at $0 with 25,000 tokens per month (~10 PRs) and a Pro plan at $19 per month with 200,000 tokens (~40 PRs). Both plans include unlimited repositories.
Does What The Diff store my code?
No. What The Diff says it does not store your code or diffs. It uses the GitHub or GitLab API to read pull request diffs at processing time and does not train models on your source.
Which git hosts does What The Diff support?
What The Diff connects to GitHub or GitLab to create your account and read pull request diffs. The homepage and pricing page both list GitHub and GitLab as supported platforms.
What are tokens in What The Diff?
What The Diff processes git diffs to generate descriptions, and larger diffs consume more tokens. Its pricing page says average pull requests use about 2,300 tokens.
How does inline refactoring work in What The Diff?
Reviewers comment on specific lines with /wtd and describe the change they want. What The Diff then suggests the refactor directly in the pull request, and the author can accept it with one click.