The cameras on smartphones are getting ridiculously good --- good to the point that most households don't even own standalone cameras anymore. But given the dimensions that phone cameras are restricted to, they're not as flexible as something like a mirrorless or DSLR with interchangeable lenses. That's where Moment comes in. The company offers a small collection of lenses that can be individually purchased and attached to its Photo Cases, which are available for a variety of phones.

Of course, this isn't the first time that someone has come up with the idea of attaching lenses to phones. There are loads of cheap solutions on Amazon, though none are as high-quality and cohesive.