Sometimes the secret to success is to pick one thing and do it well. You could easily make the presumption that "image editing" may count as a thing, but in this case, think even more specific. Over is an app that specializes in letting users place text or basic artwork on top of their photos.

Seriously, that's all it does. And it's done it well enough to attract millions of users on iOS and, according to TechCrunch, a million in funding (which the developer reportedly turned down).

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