Yeah, this one started out for android, but they've since updated it (as of two days ago I think) to be compatible with iOS as well. I've practised using it a couple of times on other people, and it's funny how, even when I can speak fine and am under no stress, I still feel better typing than speaking. It's almost like I'm inside a protected glass box, and instead of opening the door to communicate (speaking), I'm sliding notes to the outside world through the letter box, while remaining safe and secure on the inside. Before, I used to have periods when I wouldn't speak for several hours on end, just because I didn't feel like opening the door, but the feeling of internal pressure I got from having things I wanted to communicate, but not doing, always forced me into speaking. This might be a useful alternative.
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"Survival is insufficient" - Seven of Nine
Diagnosed with ASD level 1 on the 10th of April, 2014
Rediagnosed with ASD level 2 on the 4th of May, 2019
Thanks to Olympiadis for my fantastic avatar!