Scalability: Above average

Building a mobile app solo can be highly scalable, especially if the app is designed to reach a wide audience and can generate revenue through various channels like in-app purchases or subscriptions. Once developed, the app can be distributed to millions of users without much additional effort. However, the initial setup costs range from $5,000 to $20,000, and it may take 6 months to 1 year to start generating profits depending on the app's success.