WhatTheDiff

What the Diff is an AI assistant for pull requests on GitHub and GitLab. It reads the diff of each pull request and writes a plain English description of what changed, so reviewers get context without having to reconstruct it from the code. The goal is to remove the routine writing work around a pull request. Features include automated pull request descriptions, inline refactoring requested by commenting on lines with a /wtd command, and summary notifications that simplify technical changes and translate them for non technical teammates, delivered through Slack, email or webhooks. Weekly reports gather the main pull requests into one update, and public changelogs turn selected descriptions into a shareable record with a JSON feed. Controls let a team choose repositories, skip CI pull requests, delay drafts and manage token use. The vendor says it does not store code or diffs and does not train models on them, though it asks for full repository access because the platforms offer no read only diff permission. It suits developers, maintainers and product teams who want clearer pull requests and team updates. Usage is metered in tokens, with an average pull request around 2,300 tokens. The Free plan costs $0 per month and includes 25,000 tokens, roughly 10 pull requests, with unlimited repositories and rate limiting. Pro starts at $19 per month with 200,000 tokens, roughly 40 pull requests, and larger tiers of 500k, 1.5M and unlimited tokens are selectable. Pro adds instant refactoring, notifications and priority email support. Unused tokens do not roll over.