sadly those are only available for Android.
sadly those are only available for Android.
Without jailbreaking or a dev cert, you can't ensure that an app you install from the App Store on iOS isn't backdoored anyway.
I'm an iOS devotee but even I'm going to buy a second phone specifically to support sideloading of crypto software for secure communications. My phone's primary function is to communicate (despite all the smartphone value-adds) and secure and private communications are a pipe-dream on iOS.
iMessage is great (and end-to-end encrypted) but if I can't control the list of keys to which it encrypts, it's only as secure as Apple (and presumably the DoJ by extension) allows it to be.
Oh and if you want a dev user, it is a one time fee of 20 usd (or was, when I got mine).