Download Speech Assistant from the Apple App store: https://apps.apple.com/au/app/speech-assistant-aac/id1139762358
Features you may find beneficial are:
· Create categories and phrases, which are placed on buttons. With these buttons you can create messages that can be shown or spoken (text-to-speech). It is also possible to type any text using the keyboard.
· You can long press the buttons to easily edit the phrases and categories. In the settings you can edit or add multiple phrases at once.
· Categories to organize your phrases.
· Select emoji or photos on the buttons.
· Record speech or use one of the iOS voices.
· Full screen button to show your message.
· History for quick access to previous phrases.
· Share your message to social media.
· Backup to iCloud, Mail or AirDrop.
· You can use the app during phone calls.