Catch Visual Bugs
Before Your Users Do

With Storybook, each UI variant is defined upfront, so Sherlo can screenshot it instantly and deterministically across many devices, themes and languages - without replaying long E2E flows or relying on live data to set up the component in a desired state. That gives you fast, stable visual coverage from components to full screens, while E2E tests stay focused on what they're best at: validating real user paths.

Sherlo delivers a clear return on investment by giving you visual coverage that's unrealistic to achieve manually. Instead of checking every screen, device, and variant by hand, Sherlo does it automatically and only asks you to review what actually changed. That saves hours of QA time on every release, catches regressions before users see them, and keeps your UI consistently polished without slowing your team down.

Setup is quick. Sherlo integrates with your React Native Storybook - you simply run npx sherlo init, rebuild your app, and then run npx sherlo test to upload your builds for visual testing. Your stories become the test cases, so there's nothing extra to write. See our documentation for more details.

Not if you don't want to. Sherlo normally needs a new app build for changes, but with EAS Update you can reuse the same native binaries and update only the JS bundle. That turns most UI changes into a fast "publish & test" loop instead of a full rebuild. See this guide to follow an easy and fast EAS Update integration and our documentation for more details on how to run tests with EAS Update.

Sherlo runs on a curated, wide set of iOS and Android simulators that we've tuned for reliable visual output. For taking UI screenshots, simulators offer the most consistent and scalable environment, letting us test across many configurations in parallel. You can see the full list of available devices in our documentation.