I am the developer of the app Speech Central. It was nominated for the best accessible app in 2017 on AppleVis: https://www.applevis.com/blog/closed-cast-your-votes-now-applevis-golden-apples-2017
In August 2019 the app has crossed 10,000 licenses sold on all platforms, so I've decided to celebrate this with a big discount. On 2nd September (it has already started now and may be available on 3rd September too in some time zones) the in-app purchase required to add unlimited amount of the content to the app is discounted from 5.99$ to 0.99$.
The App Store link to get the app is: https://apps.apple.com/us/app/speech-central/id1127349155