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52M visits/mo+0.7%#4 Coding & Development
WhatTheDiff
Automatically detect branch changes, identify code implications, and provide accurate summaries of differences.
$19/mStarting price
1.1KMonthly visits
1Popularity
About WhatTheDiff
WhatTheDiff is an AI-powered code review assistant that can save you time and money. With WhatTheDiff, you can open a pull request and get an accurate summary of the changes in a matter of seconds. This summary includes information about what has changed, what the implications are, and how to maximize the time spent on the pull request. With these insights, you can make better-informed decisions about code changes, and spend less time debugging and reviewing code. WhatTheDiff is the perfect tool for developers who want to optimize their time and money spent on code review. With its intuitive and efficient AI-powered analysis, WhatTheDiff will help you find the best solutions for your code review needs.
Key features
- Automatically detect changes between branches and pull requests
- Identify the implications of code changes
- Generate accurate summaries of differences
Use cases
- Code review: WhatTheDiff helps developers optimize their time and money spent on code review by providing accurate summaries of differences and identifying code implications.
- Collaboration: With WhatTheDiff, team members can work together more efficiently by getting a clear understanding of the changes made to the codebase.
- Debugging: WhatTheDiff's AI-powered analysis helps developers identify and fix bugs faster, reducing the time spent on debugging.
Pros
- Automates pull request descriptions to save time on manual documentation
- Provides simplified summaries for non-technical stakeholders
- Supports inline AI refactoring to address minor issues during review
- Generates public changelogs or JSON API outputs for internal tracking
- Offers weekly progress reports summarizing weekly changes
Cons
- Requires full repository access via GitHub/GitLab API for diff analysis
- Token-based pricing may lead to additional costs for large or frequent pull requests
- Unused tokens do not roll over, potentially resulting in wasted credits
Frequently asked questions about WhatTheDiff
What is WhatTheDiff?
WhatTheDiff is an AI-powered tool that reviews the diff of pull requests and generates descriptive comments about code changes in plain English or other supported languages.
How does WhatTheDiff work?
The application uses the GitHub or GitLab API to fetch the diff of a pull request and then employs an AI model to create a summary of the changes. It does not store the code.
Does WhatTheDiff support all programming languages?
Yes, WhatTheDiff supports nearly all programming languages and can explain the diff in plain English or other supported languages.
What happens if I run out of tokens?
If tokens are exhausted, users can upgrade to a larger plan or wait until the next billing cycle. Unused tokens do not roll over, and plans can be downgraded at any time.
Does WhatTheDiff store my code?
No, WhatTheDiff does not store code or diffs of pull requests. It only reads the diff via the GitHub or GitLab API and does not train its AI model on user code.
Why does WhatTheDiff need full access to my code?
GitHub and GitLab do not currently offer a permission setting to read only the diff of a pull request, so full access is required to fetch the necessary data.
WhatTheDiff traffic & engagement
whatthediff.ai · third-party estimates from Similarweb
Data as of Sep 2026Full AI website ranking →
Monthly visits · Sep 20261.1K-59.7% MoM12-month high 2.8K (Aug 2026)
Rank among AI websites#7,469▼ 1374 vs last monthof 8,652 tools on aitoolnavio™
Top marketUnited States94.3%
Pages per visit1.16Average pages viewed
Bounce rate36%Lower than 70% of AI sites
Similarweb global rank#13,763,244#5,699,304 in United States
Traffic trend
Last 4 months · grows by one month every month
- Jun 20261.2K
- Jul 20262.2K+77%
- Aug 20262.8K+26.4%
- Sep 20261.1K−59.7%
Top countries
Share of visits · estimated visits
Compared with similar tools
Coding & Development · Sep 2026
Traffic figures are third-party estimates, good for scale and trends; they can differ from a company's own numbers. Updated monthly.
