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How your site performs on a phone.
We test your page on an emulated mid-range phone over a throttled mobile network, then score speed, accessibility, best practices and search basics.
How it works
Straight from the source.
Every result comes live from a recognised public source — named under your results, so you can check our work.
- 1Emulate a phoneGoogle's Lighthouse loads your page on an emulated mid-range phone with a throttled mobile connection.
- 2Score four areasPerformance, accessibility, best practices and search basics, each out of 100.
- 3Show real visitorsMobile Core Web Vitals from the Chrome UX Report, when Google has enough data.
Private by design
No accounts, no cookies, no tracking. NuuMa doesn't store what you check. To run the tests, the address you enter goes directly from your browser to the public services named above. The only thing kept is a small daily counter in your own browser that keeps these tools free for everyone.
Questions, answered plainly
Why does mobile score lower than desktop?
The mobile test uses a slower processor and a throttled network to reflect a typical phone, so heavy pages and scripts cost more time.
What does the accessibility score check?
Automated checks like colour contrast, labels on buttons and form fields, image text alternatives and heading order. It catches common issues; a full review also needs testing with real assistive technology.
Does mobile performance affect search?
Google uses page experience signals, including Core Web Vitals, as part of how it ranks pages — and slow mobile pages lose visitors before they ever read a word.
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