There are a number of factors which influence the cost of building an eLearning app, including the features, the complexity, the development team, and the platform. Essential features that impact the cost include user authentication, content creation, video streaming, gamification, and analytics. The cost of development can range from $10,000 to $100,000, relying on the app's complexity and the hourly rate of the eLearning software development team. It is advisable to seek quotes from different development teams and compare their services to get a reasonable estimate.