We develop across iOS, Android, and Web platforms using the latest technologies. Leveraging years of experience, we build performance-critical apps tailored to the nuances of each platform.

UI/UX Design

We love good design and want your app to stand out in a crowd. Over the years we’ve carved out best practices for creating beautiful apps that are fun and easy to use.

QA Testing

We create an extensive test plan for each project so your app is released bug free. Testing is integrated into our development cycle, rigorously test on device during each sprint. We believe in development transparency giving you a window into our process to track bugs and provide feedback through development builds.


  • Appstem did an exceptional job building Tesla’s Marketing iPad App. We are tough customers, expecting the same excellence in our app designs and interactions as our cars, and Appstem delivered a fantastic product. The team was also very responsive to our needs and tackled issues that arose in record time.

    Carl M., Tesla Motors

  • Appstem took our idea and brought it to life! It was amazing to see how quickly everything came together! The team was flexible, efficient, and a pleasure to work with!

    Faisal R., Johnson & Johnson

  • Design, creation and a quick turn around! Appstem did everything I needed, and was a pleasure to work with!

    Brian S., Hearst Corporation

  • Appstem has been awesome to work with. They took over a project we had that another vendor had worked on, and turned it around and completed it quickly. Their team was responsive and offered suggestions and expertise when we asked for them. We are so happy with the results that we are using them for our next app!

    Dan G., Digital Trends

  • At Lionsgate we worked with a number of solutions providers and mobile app developers, but Appstem really nailed it when coming up with creative ideas, involving a location-based social strategy, and brilliant execution for one of our major television shows.

    Alex B., Lionsgate

  • We had such a good experience working with Appstem that they took over the iOS development as well as Android. The Appstem team has been great to work with, they currently support all our development enhancements and new features for our iOS, Android, and web platforms. They’re a pleasure to work with and I would highly recommend them for your mobile development projects.

    AJ M., DUFL

Selected Clients

Appstem works with a mix of Fortune 500 companies and growing, innovative startups. We’ve created everything from complex, award-winning enterprise apps to consumer-focused apps and multiplayer games. We never offshore any of our work. Appstem believes it's easier to collaborate and work efficiently when every team member is in the heart of technology and innovation — San Francisco. Clients choose Appstem because our team, reputation, experience and location are second to none.