About TestSweep
Who makes these tests, how they work inside a browser, where their limits are, and why nothing you test is ever uploaded.
What this is
TestSweep is a set of 39 hardware checks across 8 kinds of device — monitor, keyboard, mouse, microphone, headphones, webcam, phone and game controller — that run entirely in a web browser. Each one looks for a specific fault: a pixel that does not light, a key that types twice, a microphone that hears its own speakers, a stick that drifts. The checks are arranged into runs, so that starting one leads naturally to the next and finishes with a reportof everything found.
The tests are meant to be used with a decision in mind: whether to buy a second-hand machine, whether a fault is the hardware or a setting, whether something needs replacing or cleaning. Every page tries to say not only what it measured but what the number means and what to do about it.
How the tests work, and what they cannot do
A browser can draw to the screen, listen to the microphone, watch the camera, read the keyboard, mouse, gamepad and phone sensors, and time all of them. That covers a great deal. It cannot see inside the monitor's own processing, measure a response time in milliseconds with a photodiode, or tell which of several sources produced a position. Where a measurement has a boundary like that, the page says where it is rather than folding a guess into the result. A number that reads as more than it is would be worse than no number.
Nothing you test is uploaded. What your screen shows, what your microphone hears, what your camera sees and where your phone is stay in the page and are discarded when you leave it. There is no account and no server-side record of any result. Theprivacy page lists the two things the site does keep, both in your own browser.
Who makes it
TestSweep is built and maintained by an independent developer, not by a manufacturer or a retailer. No test is sponsored, no result is influenced by anyone selling hardware, and the site does not sell anything itself. The projects linked in the "also from us" block are our own, and the page says so where they appear.
If a test gives a result that does not match what you see, or a page says something you know to be wrong, that is worth hearing about — the checks are only useful while they are right. The contact page says where.
Dates and changes
Every test page carries the date it was last revised, and it is the real date: pages are not re-stamped to look fresh. When a measurement method changes, the page describing it changes with it.