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

We build businesses powered by great mobile apps.

Get in Touch

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

Our team collectively has over 30 years of industry experience. We are composed of alumni from companies including Nickelodeon, JPMorgan,, and startups backed by investors including Greylock Partners and YCombinator.

Marc Gugliuzza

Founder / Engineering

Mark Robinson

Creative Director

Recent Work


Tell us a little about your project at

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