autoTween Animate

https://autotween.com

autoTween Animate is an animation app that makes the process of in-betweening key frames easier by automatically interpolating pencil strokes between keyframes. After drawing a pencil stroke on the canvas, a numeric label appears which defines the "mapping" for in-betweening strokes between adjacent keyframes. These numeric labels can be dragged to other strokes on the canvas so that the mapping is flexible.

autoTween Animate supports up to 12 layers and 2000 frames, variable-length onion skins, modifiable playback speed/range, layer visibility toggling, and copy/remove/clear/paste frames. Export is easy to mp4, jpg, and png. There are no subscriptions, ads, tracking, nor in-app purchases.

email autotween-support@protonmail.com with question or suggestions

One recommended workflow for the app is first sketching key frames in one layer, then drawing over those sketches in a methodical way on other layers. The order in which pencil strokes are drawn determines the default mapping used for interpolating the strokes of keyframes. One only presses the 'autoTween' button to then automatically generate the sequence of frames in the active layer between the two adjacent and proximal key frames.

PRIVACY
We collect no information, personal or otherwise, on you with the autoTween Animate app. This includes and is not limited to email addresses, other installed apps, user names, browsing history, photo albums, device identifiers, etc. We do not share any information with third parties because we have nothing with which to do so. The app does not sell ad space to advertisers. The app is supported by its one-time purchase price on the iOS app store.

https://autotween.com/privacy