Short answer: Loki can compare desktop and mobile screenshots of UI components represented as Storybook stories, but its documented workflow is not a general tool for opening and comparing any live website URL. For a live Indian website, use browser automation such as Playwright; no site URL was supplied here, so this guide makes no claims about a particular site’s mobile layout.
What Loki can—and cannot—compare
Loki is a visual-testing workflow for Storybook stories served by a running Storybook instance. It captures configured stories and compares them with reference images. The documented guide does not establish a workflow for entering an arbitrary live website URL and capturing its desktop and mobile pages. See the Loki Getting Started guide.
That distinction determines the right tool:
| Approach | Input | What the comparison establishes | Important limit |
|---|---|---|---|
| Loki with Storybook | Stories served by a running Storybook server | Visual changes in the configured stories and targets | The documented guide does not establish arbitrary-URL support |
| Browser automation for a live site | A page opened in configured browser contexts | Rendering and behavior for the URL and contexts actually run | Emulation is not equivalent to testing every physical handset |
If your site components already have Storybook stories, Loki is appropriate for checking their visual regressions. If the goal is to inspect a public Indian website as visitors see it, use a browser automation workflow instead.
Set up Loki for desktop and mobile Storybook comparisons
The Loki guide, last updated 2024-08-27, lists Node 16+ as a prerequisite. GraphicsMagick is optional for the gm diffing engine; Docker is needed for the chrome.docker target; and Chrome 59+ is listed for chrome.app. These compatibility details can change, so check the guide against the Loki release installed in your project.
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Initialize and inspect the configuration
- From the project root, run
npx loki init. Loki detects the project and adds configuration topackage.json. - Review the generated
lokiconfiguration. The web defaults described in the guide test laptop and iPhone configurations using the local Chrome app; they are defaults, not coverage of every browser or handset. - Adjust or select configurations to match the comparison you intend to make. Loki supports selecting configurations by matching names, for example
yarn loki test laptop.
The guide says recent Storybook versions generally need no extra integration. Older versions may require a React configuration import, and React Native projects have a separate configuration import. Consult the guide for the exact setup relevant to your installed versions.
Capture, compare and approve
- Start Storybook so Loki can access the stories. For an iOS simulator or Android emulator workflow, the guide says the Storybook app must also be running in that environment.
- Capture the baseline references with
yarn loki update. - Run comparisons with
yarn loki test. To test only a named configuration, useyarn loki test laptopor the matching name in your configuration. - Inspect the current screenshots and diffs in
loki/currentandloki/difference. Decide whether each difference is a visual defect or an intended design change. - For intended changes, approve the new references with
yarn loki approve, or use Loki’s suggested selective update command. Commit the resulting reference images with the code so future runs compare against the approved state.
Loki identifies differences; it does not decide whether they are correct. Review the affected component and its intended design before updating a baseline.
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Compare a live Indian website with Playwright
When you need to open an actual URL, use browser automation rather than treating Loki as a live-site capture tool. Playwright documents testing with Chromium, WebKit, Firefox and branded browsers, plus selected emulated tablet and mobile devices. Its emulation settings can include user agent, screen size, viewport, touch capability, locale, timezone, geolocation, permissions and color scheme. See the Playwright browser documentation and Playwright emulation documentation.
Make the comparison repeatable
- Use the same page URL, content state and capture timing in each run. If a page depends on login, query parameters or loaded data, hold those constant.
- Record the desktop and mobile viewport dimensions and the browser project or device profile used. Do not describe an emulated profile as a physical-device test.
- Separate viewport effects from browser-engine differences where possible. For example, keep the browser engine constant while comparing desktop and mobile viewport contexts, then run additional engines if cross-browser coverage matters.
- If India-specific behavior matters, explicitly configure and report the relevant locale, timezone or other context. The country reference alone does not prove that a site serves a particular language, region-specific content or behavior.
- For claims about behavior on real handsets, test physical devices separately and state which devices were used. Emulation cannot establish behavior on every phone.
Playwright’s browser and device support changes over time; its documentation advises keeping Playwright up to date. No particular Indian site or URL was provided, so there are no site-specific visual findings here.
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For a one-off screenshot of a live page, ScreenshotNeo offers a single API request and supports PNG, JPEG, WebP or PDF output. It is a website screenshot API and MCP server made by Yorker Media. The request below captures the example URL in WebP format; replace the URL with the page you want to inspect. See the ScreenshotNeo API documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo accepts cookie or consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups and chat widgets before capture; each step can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads and cache hits are not billed, and each response includes X-Page-Verdict and X-Billed headers. Its MCP server provides take_screenshot, get_page_info and capture_pdf tools for AI agents. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000 screenshots.
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Troubleshoot common comparison problems
- Loki cannot find stories or capture them: Confirm that Storybook is running and that the stories are available to Loki. If using an iOS simulator or Android emulator, ensure the Storybook app is running there too.
- The expected device configuration is missing: Inspect the generated
lokiconfiguration and the names of its targets. The documented web defaults include laptop and iPhone, but projects can configure other targets. - A Loki setup command or integration does not match your project: Check your Node and Loki versions against the guide. The guide’s compatibility notes are dated 2024-08-27; older Storybook and React Native projects may need their documented configuration imports.
- Diffs appear after an intentional design update: Review the screenshots in
loki/currentandloki/difference. Approve only changes that match the intended design, then commit the updated references. - A live-site result is being mistaken for a Loki result: Loki’s cited workflow covers Storybook stories. Use Playwright or another browser automation tool for an arbitrary live URL and document the contexts actually run.
- A mobile emulation result is being treated as proof about a physical phone: Report the emulated profile and viewport precisely, and separately test real devices when handset-specific behavior is important.
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