There are numerous mobile app development companies that have achieved great success in the industry. Here are some of the top mobile app development companies and their success stories:

1. Fueled: Fueled is a New York-based mobile app development company that has created apps for companies like Verizon, Harvard Business School, and Crunchbase. Their success can be attributed to their focus on creating visually stunning and user-friendly apps.
2. Konstant Infosolutions: Konstant Infosolutions is an India-based mobile app development company that has created apps for companies like Nestle, Citrix, and Wonder Cement. Their success can be attributed to their focus on delivering high-quality apps at affordable prices.
3. Savvy Apps: Savvy Apps is a mobile app development company based in the US that has created apps for companies like NFL Players Association, PBS, and The University of Florida. Their success can be attributed to their focus on designing user-centric apps that provide a great user experience.
4. Zco Corporation: Zco Corporation is a mobile app development company based in the US that has created apps for companies like Samsung, Verizon, and Liberty Mutual. Their success can be attributed to their focus on creating innovative and cutting-edge apps that utilize the latest technology.
5. Hyperlink InfoSystem: Hyperlink InfoSystem is an India-based mobile app development company that has created apps for companies like Etisalat, Deloitte, and Tata Motors. Their success can be attributed to their focus on delivering custom mobile app solutions that meet the unique needs of each client.
6. Dogtown Media: Dogtown Media is a US-based mobile app development company that has created apps for companies like Red Bull, Google, and CitiBank. Their success can be attributed to their focus on creating apps that utilize emerging technologies like AI, IoT, and blockchain.
7. WillowTree: WillowTree is a US-based mobile app development company that has created apps for companies like National Geographic, Fox Sports, and Johnson & Johnson. Their success can be attributed to their focus on creating apps that combine great design with cutting-edge technology.

These are just a few of the many mobile app development companies that have achieved great success in the industry. Each of these companies has a unique approach to mobile app development, but they all share a commitment to creating high-quality apps that provide a great user experience.