Best photo editors for iPhone?

With good filters! Like Retrica or something.

Filters are not photo editing, by the by. If you want a real photo editor, you're going to have to get at least GIMP for your computer, if not photoshop. And good luck finding a nice one for phones. Stick with Instagram, I promise it has enough filters. Or retrica, I guess.

I understand. I'm also a big fan of filters. Actually Fotor is really a good one. Lots of settings for different stuff specifically, and you can change the strength yourself. You can give it a shot, really good photo editor.