PR Lens

PR Lens is an open source developer tool that draws animated architecture and data flow diagrams inside pull requests.

PR Lens is a developer tool that draws animated architecture and data flow diagrams directly inside pull requests. It provides a visual representation of code changes to help developers understand updates before reading lines of text. The tool renders additions, changes, and deletions in context while keeping unchanged system parts visible for better mental models. It operates locally with no API key required and runs via an npx command or a GitHub App integration. The custom renderer uses strongly typed schemas to produce deterministic SVGs with animated data flows that function inside GitHub comments. It caters to software developers and teams looking to simplify code reviews and eliminate cognitive overload from diffs.

PR Lens at a glance

Best for: Software engineer
Runs on: Web, CLI, open source
Pricing: Freemium
Released: September 2026
Category: AI coding tool
Website: prlens.dev

Key features

Draws animated architecture and data flow diagrams inside pull requests
Highlights additions, changes, and deletions in context
Displays the whole system alongside the diff
Offers a canvas with pan, zoom, and theme options
Runs locally or via a GitHub App integration
Uses a custom renderer optimized for readability

Use it for

Reviewing code changes faster with visual architecture diagrams
Understanding data flow and system impact before reading diffs
Walking through code changes step by step on an interactive canvas

Alternatives to PR Lens

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CodeReviewBot — It automates pull request reviews on GitHub to find bugs and security issues.
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All PR Lens alternatives