jSpy is a JavaScript script that can test and detect your visited websites using a timing-based attack vector.

jSpy works only on Google Chrome and some other Webkit-based browser (like Safari and Opera).

It looks like you're using Firefox. Firefox is unfortunately not supported, so please try this website with Google Chrome if you have it available.

It looks like you're using Internet Explorer. Internet Explorer is unfortunately not supported, so please try this website with Google Chrome if you have it available.

It looks like you're using Internet Explorer on Windows Phone. Internet Explorer is unfortunately not supported.

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Press start below to start analysing.

Don't worry, no data is being recorded or transmitted!

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For more informations, read the blog post and look at "Pixel Perfect Timing Attacks" by Paul Stone.