tldr: Percy by BrowserStack is a visual testing and review platform. It captures screenshots of web apps, compares them across builds, and highlights visual changes so teams can catch UI bugs before they reach production. In late 2025, Percy launched an AI-powered Visual Review Agent that reduces review time by 3x and filters out 40% of false positives. Percy also offers a permanent free tier with 5,000 screenshots per month.

Introduction

Code can pass functional tests but still break the user interface. A missing CSS rule, a shifted layout, or a color mismatch might not stop an app from working, but it will hurt user experience. AI visual testing catches these problems automatically.

Percy, acquired by BrowserStack, focuses on catching UI bugs and visual regressions. Instead of relying on manual visual checks, Percy automates the process by capturing screenshots, comparing them pixel by pixel, and flagging differences. With Percy integrated into your CI/CD pipeline, every commit can be visually validated alongside functional and automated tests.

What Percy by BrowserStack offers

Automated screenshot capture Percy takes screenshots of your app across multiple browsers and viewports. The free tier includes 5,000 screenshots per month.

Visual diffs Screenshots from the new build are compared against a baseline. Any changes are highlighted for review.

AI-powered Visual Review Agent (October 2025) Percy's Visual Review Agent uses AI to speed up visual review by 3x. It automatically filters out 40% of false positives like anti-aliasing and sub-pixel rendering differences, so reviewers focus only on real changes.

Cross-browser and responsive checks Catch issues that only show up on certain browsers or screen sizes. Percy supports all major browsers on BrowserStack's real device infrastructure.

CI/CD integration Percy integrates with GitHub, GitLab, Bitbucket, Jenkins, and other pipelines. Visual tests run automatically on pull requests.

Team collaboration Developers, designers, and QA can review visual changes together. Approving or rejecting changes becomes part of the workflow.

Tosca support Percy added support for Tricentis Tosca test automation in 2025, expanding compatibility for enterprise teams.

Why teams use Percy BrowserStack

  • Confidence in UI: Catch unintended design changes early.
  • Speed: AI-powered review is 3x faster than manual review.
  • Fewer false positives: The Visual Review Agent filters 40% of noise automatically.
  • Free tier: 5,000 screenshots/month at no cost. Enough for small teams and open source projects.
  • Collaboration: Shared review interface helps designers and developers stay aligned.
  • Scalability: Works for small front-end projects and large enterprise apps.
  • Accuracy: Real browsers ensure differences are true to user environments.

Example workflow

A front-end team pushes a new update to their e-commerce site. Percy runs automatically during the CI pipeline:

  1. Screenshots are captured for product pages, cart, and checkout flows.
  2. Percy compares them to the baseline from the last release.
  3. The Visual Review Agent filters out false positives from rendering differences.
  4. Real visual changes show up as highlighted diffs. A CSS change caused the "Add to Cart" button to shift position.
  5. Designers review and reject the change, sending the fix back before release.

Without Percy, this issue could have gone unnoticed until users complained.

Percy BrowserStack vs alternatives

  • Applitools: Uses AI-powered visual testing and has more advanced algorithms. Higher price point.
  • Chromatic: Focuses on component-level visual testing for Storybook.
  • Manual review: Time-consuming and unreliable.

Percy by BrowserStack is often chosen for its free tier, AI-powered review agent, CI/CD integrations, and being part of the broader BrowserStack ecosystem.

FAQs

Is Percy included in BrowserStack subscriptions?

Percy is available as a separate product with its own free tier (5,000 screenshots/month). It integrates tightly with other BrowserStack tools.

Is Percy free?

Yes, Percy offers a permanent free tier with 5,000 screenshots per month. Paid plans are available for higher volumes.

Can Percy test mobile layouts?

Yes, Percy captures responsive snapshots across multiple viewports.

Does Percy only test static pages?

No, you can configure it to capture dynamic states and flows.

What is the Visual Review Agent?

Launched in October 2025, the Visual Review Agent uses AI to reduce visual review time by 3x and filters out 40% of false positives automatically.

How are differences shown?

Percy highlights visual diffs directly on screenshots, making them easy to spot.

Can designers use Percy too?

Yes, Percy is built for collaboration between developers, QA, and design teams.