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I'd also bet you a coffee that you could pretty reliably uniquely fingerprint devices this way. I don't bear OP any ill will for writing iHazApp, but I can certainly see why many would be uncomfortable with it.

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Very, very skeptical of this. Apps that people have installed tend to be similar apps.

For some subset maybe. But I guarantee you that there is not one other person on Earth that has the same set of apps installed on their phone that I do. The chances of that are astronomically tiny.

Maybe we should make an app where you put in all the apps that you have on your iPhone to find your perfect match. We'll call it appxappxappxappxappxappxappxapp.

You can filter it down even more by reading carrier information which you can access without permissions:

http://iosdevelopertips.com/core-services/carrier-informatio...

I disagree. For a related piece of work, see https://panopticlick.eff.org

I'm running a browser with only two (what I believe are common) add ons installed and a fairly uninteresting system config on common hardware. This is enough (combined with other "safe" metadata) to uniquely identify me! Compare this to iPhones, which frequently have dozens of apps installed and expose comparable device metadata.

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