What's everyone's favourite photo editing app for iPhone?

I'm looking for really good free photo editing apps for iPhones. Ones like papelook

I used an app recently named Fotor, it's a free online photo editor software.
also have app in appstore.
very esay, you can try it online or download it.
http://www.fotor.com/, hope you like it.

I like and use Snapseed the most, but Leonardo is probably the best. Snapseed is free and Leonardo is $5. There's also a free version of Photoshop that's ok.

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Instagram is owned by Facebook and in recent times it has grown to over 90 million users. The Instagram app available to download for all iOS devices is not so much a photo editing app but more of a photo filter app and social network combined, as is the Instagram service.

The app automatically crops your photographs to a square and then you can choose a filter. This creates Polaroid type photo's which whilst no good for landscapes are perfect for products and quick snaps. Although this app is not an advanced photo editor, its social nature is its main appeal.

Snapseed is perhaps the best photo editing app on this list. It is a very clever app that will automatically adjust your photo to create the very best final image. It features pinch to zoom effects and framing, and also allows you to create light leaks, as well as change saturation and brightness.

Snapseed has wonderful reviews on iTunes and because it's free, it is simply a must download for any aspiring photographer.