Truth abt the app – Siddur - Special Edition סדור Review
The truth about the app is that when you first enter it, it does prompt you for an upgrade, twice. Which is once more then necessary. Also be careful that you don't accidentally hit upgrade. Other then that, once you enter the siddur, tehillim, etc. you are free to pray peacefully and will not be prompted again by popups. The app is a great app especially considering it's free, and just be aware it's annoying on startup and then fine.
Review by Stark taka mammish on
Siddur - Special Edition סדור.