Glance

Glance is an AI testing tool that automatically generates videos of your code changes in action. When you open a pull request, it reads the diff, determines what to test, and posts video recordings directly to GitHub showing how the changes behave in a live preview. The tool supports managed browsers or bring-your-own options like Playwright and Puppeteer.

Designed for developers who review code, Glance solves the problem of understanding complex diffs by showing visual evidence of how changes work. The makers trained a reinforcement learning agent to interact with modified components, catching bugs that unit tests miss like z-index issues and scroll container problems. It's free for open source repositories.