 If you liked
Zetman
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 ...then you might like
Gatchaman Crowds
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Both anime series feature superheroes. Gatchaman Crowds has a team of superheroes called "Gatchamen" while Zetman has two rival heroes, ZET and Alphas.
One difference between Zetman and Gatchaman Crowds is the art style; the other difference is the tone of the anime. Crowds has a lighthearted tone, while Zetman is a darker and more serious anime because of its post-apocalyptic nature.