He can communicate with pictograms, showing "I want ice cream" or "I want to drive a bicycle".
I imagine that there should be a simple application, where a child constructs a sentence and then presses the "play" button, and the application pronounces it. I think that this will help a speechless child to learn literacy.
Had anyone ever came across such app?
* https://thinksmartbox.com/product/grid-for-ipad/ (there's grid player as well which is free but I think requires purchasing a desktop app)
* https://www.assistiveware.com/products/proloquo2go
Depending on your country / financial situation / medical insurance you may be able to get help with these. In the UK the NHS should provide a suitable solution. Either way if at all possible speak to a qualified speech therapist and they'll be able to help with your specific situation.
I am probably not clear enough: he already uses some kind of this app, thank god it's covered by medical insurance in our country.
What I am searching for is something with chars to teach him literacy. I want him to type "I-C-E-C-R-E-A-M" instead of choosing "icecream" pictogram and make ipad pronounce it.