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 agency based in NYC.

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

Recent Work


Interested? Tell us a little about your project at

We will be happy to answer any questions or provide you with a quote for your project within 24 hours.