What is a good iPhone app that you could use to edit videos?

I'm currently starting a youtube channel (Positive Vibes) but I want to make my videos better quality to be more interesting. I already use Youtube Capture, but all you do it put music on it and take different clips. My vlogs will be about beauty, asthetics, and advice, but nobody wants to watch boring videos. Do you recommend other apps for me? Thanks in advance.

Added (1). Free apps would be great.

Imovie (free) or Pinnacle Studio (cost $9). I prefer Pinnacle Studio because it has more effects and functionalists than iMovie

Besides iMovie, here are two of the best options: Movie Slate (http://www.movie-slate.com/) and ReelDirector (http://nexvio.com/product/ReelDirector.aspx).

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