Aniima was an animation app for iOS, developed as part of the Apple Developer Academy program at Senac São Paulo, in July 2016. it is not available on the store anymore, but you can view its source code here.
the app lets you easily animate things, frame by frame, featuring animation tools such as a timeline and onion skinning, as well as gif exporting. it was inspired by the simplicity of applications such as Flipnote Studio, and motivated by the lack of such apps for quick animating on iOS.
i was responsible for the drawing engine, as well as the timeline features.
the app being shown at Expo CIEE 2017, by courtesy of Senac São Paulo