Mobile Checkup Suite
What a browser can genuinely tell you about a phone — and what it cannot.
No permission was requested for any of this. That is the point worth noticing — every site you visit can read the same values without asking.
What no web page can read
- —Battery health, capacity or cycle count
- —Storage capacity or free space on the device
- —The processor model or how hot it is
- —How much memory is installed
- —Whether the screen has dead pixels or the glass is cracked
- —Anything about the phone's condition or age
Sites offering to check those from a browser are reading the same values as this page and guessing the rest. What can be tested is behaviour — the screen, the touchscreen, the microphone, the sensors — and those tests are on this site and are real.
How this test works
Every reading a browser will give up without a permission prompt is collected at once: screen geometry, simultaneous touch points, charge level where the interface exists, the network type the browser has estimated, the storage quota this site may use, how many cameras and microphones are attached, and whether an orientation sensor is present. Each one is shown with what it is actually worth, because several mean something quite different from what their name suggests — the storage figure is this site's quota rather than the phone's capacity, and the network speed is an estimate the browser maintains rather than a measurement. Then the list of what cannot be read at all, which is most of what people arrive wanting.
What the results mean
- Battery charge
- How full it is, not how healthy. Capacity, age and cycle count are not available to any web page — a phone battery test in a browser cannot exist.
- Storage
- The quota this site is permitted to use, which is a fraction of free space and unrelated to the phone's capacity.
- Network
- An estimate the browser maintains from recent traffic. The speed test measures rather than estimates.
- Cameras and microphones
- Counted without permission, which is why the browser withholds their names. Whether they work needs the actual tests.
- Not readable
- The list is the useful part of this page. Sites offering to check those are reading the same values and guessing the rest.
Common problems and fixes
- Most values say not available
- You are probably on Safari or Firefox, which removed several of these interfaces to limit fingerprinting. That is the browser protecting you rather than anything wrong with the phone.
- I wanted battery health, and it is not shown
- No web page can. On iOS it is in the battery settings; on Android it varies by manufacturer and often needs an app with system access.
- It says storage is a few gigabytes and my phone has 256
- That figure is the quota this site may use, not the device's capacity. Browsers deliberately do not expose real storage.
Frequently asked questions
Why can a website not check my phone's battery health?
No. The interface that exists — where it exists at all — reports charge level and whether the device is plugged in. Health, capacity, age and cycle count are not exposed to web pages by any browser, on any platform. A site offering to check it from a browser cannot be doing so: it is showing the charge percentage and hoping you read it as health.
What can a website actually test on my phone?
Behaviour rather than hardware condition. A browser can show you fills to find dead pixels, track your finger across the screen, record from the microphone and play it back, read the orientation sensors while you move the device, and measure your connection. All of those are real tests and they are on this site. What no browser can do is inspect the components.
Why does this page not ask for permission?
Because none of these values require it, which is the uncomfortable part. Screen size, touch capability, charge level, network type and device counts are all readable by any site you visit, silently. The things that do require permission — the camera, the microphone, your location, the motion sensors — are the ones you get asked about.