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I don’t think that iOS would allow for keylogger on non-jailbroken iPhone even with side-loaded app, there’s still sandbox working. While no one denies that AppStore increases security, it doesn’t mean there will be no signing or sandbox anymore.
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Replying to and
iOS supports third party keyboards so app store review is the only theoretical barrier to it. iOS doesn't directly support third party accessibility services like Android. They support a lot of the same capabilities but mandate special review. Not required for keylogging though.
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