If you are looking for an alternative to Explain Everything you should check out Animoby.
Its free on the Apple App Store as well as Google Play. It has some great features and what I like the most is the UI, it is very user friendly.
Create quality presentations using VOICE and a variety of design tools (draw, paint, type, image), and publish or share via e-mail. Animations are created when users pick a tool and simply touch the screen, and voice can accompany designs by the press of the record button. Unlike other apps that create presentions, Animoby’s sharing process is simplified due to compact file sizes it uses.
I have also been impressed with the some of the editing options for things like images. All in all a great app and well worth downloading.