Appstem is a high-end Android app design firm that has worked with some of the largest companies in the world. The firm has an aggressive and modern approach to developing apps for Android devices. It involves looking at problems in a different way and coming up with solutions that few people have thought of in the past. The firm has managed to make a very wide range of different apps for clients. These include simple, fun apps designed for a single seasonal purpose and massively complex apps made to drive entire social networks. Appstem does not believe in outsourcing Android app development. The San Francisco firm uses only in-house developers or people in the area. This helps to create a more focused development process and a better product in the end. This also speeds up app development so that clients get the finished product fast. The long list of Fortune 500 clients shows that Appstem is one of the best Android app design firms in the industry.