Next to iMovie, the other proper video editing app for iPhone is Splice.
Other video editing apps are too simplistic and do not come close to desktop versions.
Splice is different and recently got even better after being acquired by a new owner.
It’s free. Does not have watermarks. No limit to the length of videos.
I will post a review soon.
Adrian Lee
AdrianVideoImage.com
The video editing app has been expanded with new features, allowing users to create professional-grade projects from their existing videos and photos.
Source: Splice Relaunches iOS Video Editing Platform with New Features