iPad 1 , I think I've been hacked, how can I check?
I would start by googling
key logger ipad
because I'm pretty sure no keylogger was ever made for ios
and like all malware then it's not cross platform so a windows key logger would not work
not even a osx key logger would work
Only way you could have been hacked is if the iPad was out of your control for at least an hour. Do a spotlight search for Cydia or Redsn()w. If neither are found you have not been hacked.
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