The cost of developing an e-learning mobile app in the US can vary widely based on various factors such as the complexity of the app, the features and functionalities required, the technology stack used, the development team's hourly rates, and the app development timeline.

According to industry estimates, the cost of developing a basic e-learning mobile app with standard features such as user authentication, course content delivery, and basic analytics can range between $25,000 to $50,000. However, if you require more advanced features such as gamification, social learning, AI-based personalized recommendations, or virtual reality, the cost can go up significantly.

Additionally, the cost of developing an e-learning mobile app development can vary based on whether you choose to develop a native app (built for a specific platform such as iOS or Android) or a cross-platform app (built to work on multiple platforms). Native apps tend to be more expensive, but they offer better performance and user experience. Cross-platform apps are generally more cost-effective, but they may have performance issues and limitations.

It's important to note that the cost of app development also depends on the hourly rate of the development team, which can vary from $75 to $250 per hour, depending on their experience and location. Therefore, it's essential to work with a reputable app development company or freelancer and get a detailed estimate based on your specific requirements.