Lenzon — watch your codebase explain itself

Three acts

Quiet on set. We point at your repo and roll.

Lenzon splits the work the way a film crew would. A fast scout reads the shape of the project. You pick the story. Writers, producers, and directors craft the scenes and the detail is brought to life.

Scout the repo

Our scene scout quickly reads the repo. It comes back with the major subsystems, entry points, and what looks load-bearing.

Choose the angle

Overview, focused-brief, scorecard, or walkthrough. Pick a lens and a depth. Only the parts you care about get read deeply.

Watch it play

The player renders code, state and data diagrams, motion and deep analysis with narration tuned to your audience.

Where it runs

Meet your code where you already work.

Lenzon installs as a GitHub App and a VSCode extension. Both run on your own Anthropic key, free on public repos while we're in beta.

GitHub App

Review & Explain every pull request

Install the GitHub App once and Lenzon watches your pull requests. When a PR opens, it produces a reviewer-grade briefing — a narrated walkthrough with the evidence on screen — so the team can review faster and more confident.

The universal install surface — available on every plan, including Free.
Runs free on public repos; private repos upgrade to Pro.
Posts back to the PR so the briefing lives next to the diff.
Fails silent — it never blocks your pull request.

Get it on GitHub

VSCode extension

Explain code without leaving the editor

The VSCode extension puts Lenzon in your sidebar. Sign in once, point it at a repo or a pull request, and watch the narrated walkthrough play right inside the editor.

Sidebar panel with one-click sign-in.
Scan a repo or PR and play the walkthrough in-editor.
Public repos work install-free; bring your own key.
Shares the same account, credits, and plans as the web app.

Get it on the VS Code Marketplace

What you get

A narrated walkthrough, not a pile of notes.

A paced, narrated presentation with real code on screen, highlighted line-by-line where it matters.
Tunable audience factors — so the same analysis can brief an exec or onboard a junior developer.
Re-render on demand. Change audience, pace, or persona without re-reading the repo.

Bring your own key

Free while we're in beta.

Public repos are 100% free during the beta — bring your own Anthropic key and we waive our fee. Private repos and managed-key plans are paid. Priced so you never batch PRs to save money; review each one as it lands. Failed runs aren't charged.

See full pricing

Free in beta

$0 / bring your own key

Public repos & pull requests, the GitHub App and VSCode extension, our platform fee waived. Private repos start at $22 / 2,500 credits.

Start free