Kuroma
Mobile Optimization
What this check reads on your page
The viewport meta tag is read first, and it gives this factor its largest single share of credit when that tag sets width=device-width and an initial-scale. The check counts the images that carry a srcset or sit inside a picture element as a share of all images, treating a page with no images as having nothing to fix, and it checks that no Flash object or embed remains. Two smaller tags round it out: theme-color, and either spelling of the mobile-web-app-capable meta tag.
Our verdict on the evidence
Deliberately down-weighted No AI-engine evidence exists for mobile signals; this is classic search hygiene (Google page experience) retained at a modest weight.
Google Search Central guidance on AI features (no special schema needed, no ideal page length)
Nothing here is read by an AI fetcher, which requests the page once and never resizes it; the score exists because Google's index, which grounds AI Overviews and AI Mode, still ranks the mobile rendering of a page. It cannot tell you whether the page works on a phone, only whether the tags that ask a browser to try are present, so a perfect score is a template fix and a low one is a ten-minute one.
What it is worth
20% of Technical Optimization, which is 4 points of the overall 100.
How audited pages score on it
Based on 30,738 audited pages.
The median page scores 60, and the middle half of pages score between 60 and 75.
- Good (75 to 100)7,836 (25%)
- Moderate (50 to 74)18,698 (61%)
- Needs work (25 to 49)2,059 (7%)
- Critical (0 to 24)2,145 (7%)
14% of audited pages score below 50 on it.
Where it fails most and least
Industries that fail it most
- Marketplace: 24% of 211 audited pages fail it
- Government / GovTech: 23% of 141 audited pages fail it
- Gaming: 21% of 817 audited pages fail it
- InsurTech / Insurance: 20% of 144 audited pages fail it
- Publishing / News Media: 19% of 905 audited pages fail it
Industries that fail it least
- MarTech / Marketing Platform: 2% of 201 audited pages fail it
- AI / Machine Learning: 2% of 477 audited pages fail it
- Cybersecurity: 3% of 108 audited pages fail it
- Digital Health / Health Tech: 3% of 128 audited pages fail it
- SaaS / Cloud Software: 5% of 188 audited pages fail it
How to fix it
- Add <meta name="viewport" content="width=device-width, initial-scale=1"> to every page template.
- Serve images with a srcset, or through a picture element, so at least half of them are responsive.
- Remove any remaining Flash embeds.
- Add a theme-color meta tag and the standard mobile-web-app-capable tag.
What has changed in this factor
No version names this factor in its per-factor record.