Question: what video app do i need for iphone?
Answer: iMovie. The best iPhone video editor for casual movie-makers. ... 
LumaFusion. An iPhone video editor for seasoned mobile videographers. ... 
Adobe Premiere Rush CC. Adobe's expertise shrunk down to a palm-sized video studio. ... 
Filmmaker Pro. ... 
Clips. ... 
Magisto. ... 
Quik - GoPro Video Editor. ... 
VideoGrade.