Say Bananas! was built for children with childhood apraxia of speech but can be used for children with any type of speech sound disorder (SSD). Hair et al. (2021) included a sample of 10 children SSD and Prof Kirrie Ballard has just completed a trial with 7 children with cleft palate.
Here is a Youtube video giving an overview of the app and basic instructions on how to use it. https://www.youtube.com/watch?v=4Unh1uKJWwA
SayBananas! will be launched it in the apps stores soon.