TouchChat is another Augmented & Alternative Communication (AAC) app available for individuals with disabilities that impact their ability to use natural speech. For $149.99, it is still less expensive than other full-featured AAC devices and can work across iOS devices.
This is a full-featured Augmented & Alternative Communication solution for $189.99. While this seems pricey, it is significantly less expensive than other AAC devices.
"FreeSpeech is a communication tool based upon research in augmentative and alternative communication (AAC) and human-computer interaction, as well clinical insight and expertise in speech and communication disorders." This free app could also be used to support early readers.