Most frontend pull requests are reviewed using a combination of code diffs, screenshots, and preview deployments.

The problem is that none of these show the actual user experience.

A reviewer might verify that a page loads correctly, but they rarely have time to click through every flow, test every interaction, or compare the experience before and after the change.

As a result, the issues that often slip through aren’t broken builds—they’re subtle UX regressions:

• Layout shifts
• Broken mobile experiences
• Multi-step flow issues
• Animation glitches
• Unexpected interaction changes

Preview deployments help, but they still require reviewers to manually discover what changed.

I’m curious how other teams approach frontend reviews.

Do you rely on screenshots, preview environments, Storybook, visual regression testing, or something else?

P.S. We kept running into this problem ourselves and ended up building an open-source tool called PR Preview that automatically generates before/after videos for pull requests so reviewers can see the visual impact of a change.