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PR Lens

Draws architecture and data-flow diagrams in pull requests to help you understand changes first

free
Last Updated 9/8/2026

About PR Lens

PR Lens is built for reviewing pull requests that contain AI-generated code: it draws animated architecture diagrams and data-flow diagrams inside the pull-request page, so reviewers can see how a change affects the system before reading the actual code. It keeps the surrounding parts of the system to help you build a model of the whole; once the app is installed, it draws diagrams for every pull request in the repositories you select and redraws them after each push. The project is MIT-licensed and can be run locally.

Best for

Code reviewers
Developers using AI coding agents
Development teams maintaining open-source repositories

Best use cases

Reviewing AI-generated pull requests

Understanding changes across systems

Tracking pull-request diagrams after pushes

Running the open-source tool locally

Features

Animated architecture diagrams

Draws animated architecture diagrams inside the pull request, so you review the change first.

Data-flow diagrams

Draws data-flow diagrams inside the pull request to make sense of how the system changes.

Whole-system view

Keeps the unchanged parts of the system to help you build a model of the whole.

Redrawn after each push

Once a repository is selected, its pull requests are redrawn after every push.

Pros

  • View architecture and data-flow diagrams directly in pull requests
  • Covers the unchanged parts, making it easier to build a model of the whole system
  • Runs locally under the MIT license
  • Pull requests are redrawn with each push

Pricing Plans

Open source

$0unspecified
  • Free for open-source projects

* Pricing information is for reference only. Please refer to the latest announcement on PR Lens's official website.

Tool Information

DeveloperPR Lens
Release Date9/8/2026
Pricingfree