Google's Mobile-Friendly Test, its API and the Mobile Usability report in Search Console were retired on 1 December 2023. Google pointed people to Lighthouse instead. Lighthouse is useful for speed, but it looks at one page at one screen size and does not tell you whether your menu opens off screen or your product grid breaks at 360 pixels.
SignalCrawler's audit does the job the old test did, and more: it opens representative pages of your site in a real browser at ten screen widths and reports what actually breaks. The free scan tests a few pages; standard and deep scans cover more of your page templates.
What the test checks
| Check | What it means for visitors |
|---|---|
| Viewport meta tag | Without it, phones show a shrunken desktop page |
| Horizontal scroll at 320 to 430 px | The page moves sideways and content is cut off |
| Overlapping or cut-off elements at ten widths | Text on top of text, buttons hidden behind others |
| Tap targets smaller than 24 px | Links and buttons that are hard to hit |
| Text too small to read | Visitors have to zoom |
| Form fields under 16 px | iPhones zoom into the page when a field is tapped |
| Pinch-zoom disabled | People with low vision cannot enlarge the page |
| Fixed bars covering the screen | Header, cookie banner and chat leave little room for content |
| Menus and dialogs off screen or not scrollable | Visitors cannot reach parts of the menu |
| Layout with longer text and missing images | Whether the design survives real content |
Each finding comes with a screenshot of the page at the width where it breaks, the element outlined, and the number of pages of that template affected.
How to run it
- Enter your site's address above and create a free account (no payment details).
- The audit crawls the site, picks representative pages and tests them in the browser. It takes a few minutes.
- Open the report's mobile and QA findings, or download the bug list as a spreadsheet for your developer.
Why test more than one page
Mobile problems belong to templates. If the product page template breaks at 375 pixels, every product page breaks. Testing one URL at a time, as the old Google tool did, makes it easy to check the homepage and miss the pages people actually land on from search.
Doing it by hand
You can check any page yourself with your browser's device mode; see how to test a website on different screen sizes. When you find a sideways scroll, this guide shows how to find the element that causes it.