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Instagram-style filters are wickedly popular, but Aviary only has a handful included with the app (the rest are available in packs of 12 for download). There's also no way to share photos directly from the app—not even email or Facebook uploads.
There are thousands of photo editors across both of the major app stores. They don't all need to reinvent the wheel, and it's easy to find an audience when you aim for the middle and sell the app up for free. Along those lines, Aviary basically succeeds because of how clean, straightforward, unimposing, and free it is.
It's mostly interesting because we might see this same editor pop up in other apps. Aviary's source code is open to other developers who want to include it in their 3rd party web and mobile apps. As one part of a more fully developed system, it could be a great tool.
But should you download the baseline version of Aviary? Well, if silly hats and glasses give you the giggles, have at it—we've all bought apps for dumber reasons than that, and it's best not to think about these decisions too much.