Alakazapps apps include a feature called the Welcome Instructions where you can read a short description of the effect, watch a full performance/explanation video and of course perform the trick.

Professional from start to finish.
The videos are shot in a professional mini-studio to produce the clearest visuals and edited using industry leading Final Cut. The care and attention to detail results in a dynamic tutorial experience that everyone from hobbyists to professionals will find easy and intuitive.

Keeping secrets.
The Welcome Instructions can be turned off from the iPhone settings menu. Once turned off, there's no danger of the secret being revealed during a performance.