Can't find it. ChatSecure on iOS is a crashy mess and TextSecure is android only. TextSecure oddly requires phone numbers vs some sort of login system too, so I can't even use it with an android tablet for example last time I checked.
Can't find it. ChatSecure on iOS is a crashy mess and TextSecure is android only. TextSecure oddly requires phone numbers vs some sort of login system too, so I can't even use it with an android tablet for example last time I checked.
That's because it's an SMS app, not an IM app. It probably has the best crypto going though, and the user experience is nice (well, until you move to KitKat where every bloody app wants to eat your text messages and you end up with all your texts across more than one of them).
A feature of OTR is you can't prove who wrote which message.
If you get a device and download a bunch of logs, that's going to be enough for most purposes unless you're actively engaging in counter-espionage (planting fake logs, mixing up your comms etc.)