What the Diff

Turn Code Changes Into Clear Communication

What the Diff is an AI-powered code review assistant that automatically analyzes pull request diffs and generates human-readable descriptions of code changes. It bridges the gap between technical code and clear communication, helping development teams spend less time explaining changes and more time building.

Key Features & Capabilities

• Automatic PR Descriptions – Generate clear, contextual pull request descriptions automatically from code diffs, giving every reviewer the context they need without manual write-ups

• Team Summary Notifications – Keep non-technical stakeholders informed with simplified summaries delivered via Slack, email, or webhooks in plain language or translated to other languages

• Weekly Progress Reports – Consolidate a week's worth of pull requests into a single digestible update, reducing status meetings and update chasing

• Inline Refactoring Suggestions – Request code improvements directly in PR comments and receive AI-assisted refactoring recommendations

• Public Changelogs – Automatically generate public-facing changelogs from your pull requests, with JSON API access for custom integrations

• Granular Controls – Configure per-repository settings, skip CI pull requests, delay draft processing, and manage token usage according to your workflow

Who It's For

What the Diff serves developers who want faster code reviews, maintainers managing multiple contributors, and product teams needing visibility into technical progress without diving into code. It works seamlessly with GitHub and GitLab, fitting into existing workflows without requiring new tools or processes.

How It Works

Connect your GitHub or GitLab repositories, open pull requests as usual, and What the Diff automatically reads the diff and generates descriptions. The tool processes diffs using AI models to create contextual summaries, supporting nearly all programming languages. Importantly, no code is stored—the service only reads diffs via the GitHub/GitLab API.

What Makes It Different

Unlike manual PR descriptions or generic automation, What the Diff understands not just what changed, but why. It explains the intent behind code modifications, making reviews more efficient and keeping entire teams—technical and non-technical—aligned on progress. The token-based pricing model scales with usage, and unused tokens don't roll over, encouraging right-sized plan selection.