Good app to enhance quality of a video?

I took a video and came out fuzzy, I was wondering if there was an app to clear the vision up a bit. Its on an iphone

Not likely. "Came out fuzzy" could be due to poor lighting, lost of motion or movement of the camera during capture… IMovie and Final Cut Pro X have an "shake removal" feature, but it can only do so much. Recorded poor lighting can't be fixed.

Since you did not tell us what computer you have, we don't even know if iMovie or Final Cut will work on your computer - Apple makes those titles for Macintosh only… You can try iMovie on the iPhone, but it is not free…

You can't magically replace video. You need a better video camera.

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