If you want to play from memory, do learn to play from memory,
each view of the notation is a step backwards because you are playing from notation, not from memory.

Piano Trainer is a teaching software, which helps you to learn individual piano compositions so that you are able to play them from memory.

You can learn pieces that are already prepared in a form of Piano Trainer app data or you can create your own Piano Trainer data file for any piece you want. In such a case you need to scan the scores, load them to the application, then divide the piece into small chunks called fragments, record each fragment using inbuilt sequencer and that is all. Then you can learn and practice. 
Learning with Piano Trainer combines visual (notation) and aural (sound) form to reach maximum learning speed and effectivity, as well it analyses everything you play and informs you if you play correct or wrong. The main emphasis is on such a kind of exercise when you only watch your hands and keyboard.

Tutorials how to practice with Piano Trainer as well as how to prepare Piano Trainer data are available here.

Piano Trainer app brings:

- natural and amusing way of learning
- direct learning to play by heart
- effective way of practicing as well as refreshing of formerly learned compositions
- deeper learning than from purely visual template
- systematic / cumulative way of learning compositions per individual fragments (bars) and sequences
- building natural musical memory - it's capacity, speed and durability
- building deeper insight into playing piano and music generally

More on Documentation page.