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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchMonitor a website’s visual changes by capturing the pages and interaction states that matter at selected mobile and desktop viewport sizes, then comparing each capture with an approved baseline. Playwright Test provides screenshot comparisons in your test suite; Chromatic and Percy offer hosted visual-review workflows. A screenshot at one width does not test the others, and any difference should be reviewed before the baseline is changed.
Choose what to monitor
Start with a small set of pages and visible states that would matter to users if they changed. Depending on the site, that might include a landing page, an open navigation menu, a product detail page, or a checkout step. Monitoring fewer, useful cases is easier to maintain than taking screenshots of every route without a clear purpose.
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Decide which viewports to capture based on the responsive layouts and breakpoints your site actually uses. A narrow mobile viewport and a desktop viewport are a practical starting point, but the exact dimensions are site-specific. Add widths where the layout changes or where your users need coverage; do not assume one mobile screenshot represents every phone-sized layout.
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Choose a visual-testing workflow
All three approaches below compare rendered screenshots, but differ in where capture and review happen. The choice depends on whether you prefer project-managed references or a hosted review workflow; the cited documentation does not establish one as universally best.
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| Approach | Workflow | Viewport handling | Review and baseline | Practical caveat |
|---|---|---|---|---|
| Playwright Test | Screenshot references and comparisons are built into Playwright Test. Playwright visual comparisons | Configure browser projects, viewport settings, or device emulation. Playwright emulation | Initial runs create reference screenshots; later runs compare against them. References can be refreshed with the update-snapshots option. Documentation | Rendering can vary across environments, so keep baseline and comparison conditions consistent. |
| Chromatic | Hosted visual tests integrate with Playwright and other documented integrations. Chromatic Playwright | Configure viewports globally or for tests in supported integrations. Chromatic viewports | Cloud snapshots and a hosted visual-review workflow. | Its FAQ says smaller viewport tests are not iOS or Android physical-device tests. Chromatic mobile FAQ |
| Percy | Hosted responsive screenshot testing with configured widths. Percy responsive testing | Provide responsive breakpoint widths for snapshots. | Review responsive comparisons in hosted build results. | Each responsive width counts as a separate screenshot toward monthly screenshot usage, according to its documentation. |
Set up Playwright screenshot comparisons
In Playwright Test, write tests for the pages or states you selected and use toHaveScreenshot() to compare a new capture with its reference. Configure each intended viewport as a test input; the test must actually run at every width you want to monitor.
- Choose representative page-state pairs. Include only stable, meaningful states, such as a page after its primary content has loaded or a menu after it has been opened.
- Configure your target viewports. Set the dimensions in the relevant browser project or test, or use a device preset where appropriate. Keep the same viewport inputs on baseline and comparison runs.
- Create the baseline. Run the tests to generate reference screenshots. Review these references to confirm that they show the intended content and state.
- Run comparisons in development or CI. Inspect reported differences when a later capture does not match its reference.
- Update references only for intentional changes. After reviewing the visual change, use Playwright’s update-snapshots option to refresh the reference when appropriate. Do not automatically accept every new rendering as correct.
For exact API and command details, use the current Playwright screenshot comparison documentation. Its comparison guidance also cautions that screenshots can differ with the host operating system, browser version, settings, hardware, power source, and headless mode. Run baseline creation and comparisons in a consistent environment to reduce unrelated differences.
Set up responsive widths in hosted workflows
Chromatic
Chromatic documents viewport configuration globally or at test level for Playwright, as well as in other supported integrations. Define the widths you need to monitor and ensure the capture workflow exercises them. Its configured smaller viewports are viewport tests, not tests on physical iOS or Android devices, according to its mobile testing FAQ.
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Percy
Provide the responsive breakpoint widths for the snapshots you want to compare, then review the resulting build in Percy. Plan usage around the documented rule that each responsive width counts as a separate screenshot toward monthly screenshot usage. See Percy’s responsive testing documentation for its workflow.
Make captures repeatable
A visual comparison is useful only if the capture conditions are sufficiently consistent. Keep the browser and operating-system environment stable between creating a baseline and comparing against it. Also make sure each test reaches the same page state before capture: a menu should be consistently open or closed, and the expected content should be present.
- Run the same selected pages and states on every relevant comparison run.
- Use the same viewport dimensions for each corresponding baseline and new capture.
- Keep the browser version, operating system, settings, and execution mode consistent where practical; Playwright identifies these and other host conditions as possible sources of screenshot variation.
- Review each visual change before updating its baseline. A difference is a signal to inspect, not proof that the site is broken or that the change is intended.
Emulated mobile width is not physical-device testing
A browser configured to a narrow viewport checks how a page renders at that size in the configured browser environment. It does not establish how the page behaves on a physical phone. Playwright provides device parameter presets for emulation, while Chromatic’s FAQ explicitly distinguishes its smaller viewport tests from iOS and Android mobile testing. If your goal includes device-specific behavior, treat physical-device testing as a separate requirement rather than inferring it from a viewport screenshot.
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For a single capture without configuring browser automation, ScreenshotNeo accepts a URL in one GET request and returns an image or PDF. For example, this cURL request saves a WebP screenshot of Stripe:
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Every run reports visual differences
Check whether the baseline and comparison ran with different operating systems, browser versions, settings, hardware, or headless mode. These conditions can affect rendered screenshots. Standardize the environment, then review the remaining differences rather than replacing references without inspection.
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A mobile layout change is missing
Confirm that the test actually captures the width where the responsive behavior changes. Viewports are configured inputs: a capture at one width does not cover another. Add the relevant width to the Playwright project or test, Chromatic viewport configuration, or Percy responsive widths.
A small viewport is being treated as a real-phone test
Clarify the test goal. A smaller browser viewport is useful for checking responsive layout, but it is not evidence of behavior on a physical iOS or Android device. Use a separate device-testing workflow if physical-device behavior is in scope.
A baseline was updated but the visual change is wrong
Restore or recreate the approved reference and rerun the comparison after checking the page state and viewport. Baseline updates should follow review of the change; automatic acceptance can hide an unintended regression.
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Hosted screenshot usage is higher than expected
For Percy, count each configured responsive width as a separate screenshot under its documented usage model. Choose widths that exercise meaningful layouts rather than adding redundant captures.
Cost and performance considerations
The cited product documentation establishes workflow details, but does not provide a basis here for comparing current prices, relative performance, or defect-reduction rates. For a hosted workflow, check the provider’s current terms and usage model before adopting it. For Percy specifically, include each responsive width in your screenshot-usage estimate.
For reliability, prioritize stable capture conditions and deliberate review over increasing the number of screenshots indiscriminately. A maintained set of meaningful pages, states, and widths is easier to interpret than a large set of noisy comparisons.
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