WhatTheDiff
AI-generated pull request summaries, changelogs, and inline refactoring for GitHub and GitLab.
About
WhatTheDiff is an AI-powered GitHub and GitLab application that streamlines code review by generating pull request descriptions in plain English from the git diff. Beyond descriptions, it produces rich summary notifications for non-technical stakeholders (with translation), beautiful public changelogs with a JSON API feed, weekly progress reports, and inline AI refactoring triggered with /wtd comments.
It supports nearly all programming languages, processes diffs on token-based pricing (average PRs use roughly 2,300 tokens), and notably does not store user code or diffs — it uses the GitHub and GitLab APIs exclusively for diff processing. A free plan includes 25,000 tokens per month, with Pro at $19/month for 200k tokens.
Limitation: it is a focused single-purpose tool in a space where broader code review platforms (and GitHub's own Copilot summaries) increasingly bundle similar features. Token-based pricing means heavy-PR teams should watch consumption, as tokens do not roll over monthly.
What it can do
- Automated AI pull request descriptions and summaries
- Stakeholder-friendly translated notifications and changelogs
- Inline AI refactoring via /wtd comments
- Weekly progress reports across repositories
Setup
Install the GitHub or GitLab app on your repositories; summaries generate automatically on pull requests.
Prerequisites
A GitHub or GitLab repository; free plan covers 25,000 tokens/month.
Use cases
Works with
Trust score — 6/10
Scored 6/10 (metrics tier, metrics-v1). Evidence: Verified via vendor site/docs/GitHub and reputable coverage, wave 59; Trending score 60/100 from researcher assessment.
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.