I went through aalllll the top iPhone photography apps lists and tested them out myself in order to come up with a real top 5 that cuts out all the fluff (like, why does every list of top apps for photography include Instagram as if a billion people aren't already using it?).  

Top 5 apps to level up your iPhone Photography

A list of top apps to take your photography skills to the next level (and the only guide that doesn't include Instagram)