mobile.|design.|development.|new york city.

We build businesses powered by great mobile apps.

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77th Street Apps is a mobile design and development studio based in NYC.

Our team has extensive industry experience and we are composed of alumni from companies including Nickelodeon, JPMorgan,, as well as startups backed by well known investors including Greylock Partners and YCombinator.

Marc Gugliuzza

Founder / Engineering

Mark Robinson

Creative Director

Recent Work


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We are happy to provide free quotes as well as references from past clients.