What photo app can make multi photos on a round frame?

I'm an iphone user and I'm trying to figure out what app do I use to have three photos in a round shape. Mainly for instagram use.

Diptic lets you combine and edit photos to create awesome collages that can be shared via email, Instagram, Facebook, Twitter, Flickr or Tumblr. With text captions, 14 filters, rounded borders, fun background textures and 179 customizable layouts, there are unlimited options to create unique photo collages!

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