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#88th of 15 in Code review and testing

pr-lens

Posts animated architecture and data-flow diagrams as pull request comments

Live demo ↗ (opens in a new tab)Website ↗ (opens in a new tab)Repository on GitHub ↗ (opens in a new tab)
Stars
2.2k
License
MIT
Last commit
Oct 2026
Last release
Oct 2026
Language
TypeScript
Stars, last 9 weeks+2,159
18 Aug 2026: 21 stars25 Aug 2026: 21 stars1 Sept 2026: 69 stars8 Sept 2026: 980 stars15 Sept 2026: 1,192 stars22 Sept 2026: 1,303 stars29 Sept 2026: 1,769 stars6 Oct 2026: 1,876 stars13 Oct 2026: 1,975 stars20 Oct 2026: 2,180 stars

21 on 18 Aug 20262,180 on 20 Oct 2026

From GitHub's daily star counts.

Checked on GitHub.

Overview

PR Lens reads a pull request diff with an LLM and posts a comment containing animated diagrams of the components touched and the calls between them, with new, changed and removed parts colored. It runs as a hosted GitHub App, a GitHub Action or GitLab/Bitbucket pipeline with your own model key, or through an agent skill and CLI that draw diagrams before a PR exists. An interactive canvas offers walkthroughs and per-arrow payload views.

Who it is for: Teams reviewing large PRs and agent users wanting visual code explanations

Ranked among open-source alternatives to CodeRabbit (#8 of 10).

Strengths

  • Covers GitHub, GitLab and Bitbucket, with an Action, CI component and pipe
  • Action accepts Gemini, OpenAI or any OpenAI-compatible endpoint via base-url
  • Corrections like rename and exclude live in pr-lens.yml and survive reruns
  • Agent skill and CLI validate diagrams locally before any PR is opened

Weaknesses

  • Diagrams are LLM-generated, so names can be wrong and need config fixes
  • Diff is sent to the chosen model provider
  • Action comments are static; the checkbox view selection works only in the App
  • On GitLab.com, project access tokens need a paid plan; Free uses a personal token

What it needs

  • Needs GitHub App, GitLab CI or Bitbucket Pipelines, LLM API key (Gemini, OpenAI or compatible), Node.js (npx CLI)
  • Models: Gemini, OpenAI, OpenAI-compatible /chat/completions

Also in Code review and testing

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2react-doctorCLI that scans React codebases for state, performance, security and accessibility issues15k starscustom license74 out of 100
3hunkTerminal diff viewer for reviewing code changes, with inline agent notes9.7k starsMIT74 out of 100
#4no-mistakesLocal git proxy that runs AI review, tests and lint before opening a PR8.9k starsMIT73 out of 100
#5pr-agentLLM pull request reviewer that comments via /review, /describe and /improve13.5k starsMIT71 out of 100