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Assert is a code review tool for GitHub pull requests. It groups related changes into clusters, renders changed UI components so you can try them, and tracks what you’ve reviewed as the pull request changes.

Getting started

Your Inbox lists the pull requests that need your attention. Install the Assert GitHub App on your repositories, then pick a pull request from the inbox. If you can’t install the app, assert-local opens an inbox using your existing GitHub access.

Your first review

Review a pull request and submit feedback.

Review locally

Use Assert with your GitHub CLI account.

Features

Reviewable units

Read related changes together across files, such as a feature, its tests, and its callers.

UI previews

Interact with changed components and comment on them.

Re-review

See what changed since your last review.

Merge candidates

Review the PR merged with the latest base branch before updating it.

Cloud agents

Send review feedback to Cursor or Devin, then review the fix.

MCP

Give your coding assistant access to Assert’s clusters and your review progress.
For help, email support@assert.dev.