1. Market demand: Necessary App's positioning is "focusing on health management", and it has found its position and market demand in the market facing the demand of people's healthy life.

2, user experience: Necessary APP provides complete functions, simple operation, simple and beautiful interface, good user experience, which is one of the important factors to attract users.

3, big data analysis: Necessary APP provides personalized health advice to users by collecting their health data and conducting big data analysis, which improves user engagement.

4. To sum up, Necessary APP adopts the business model of traffic realization and paid service, and realizes commercial success by providing high-quality health management services and advertisement realization. At the same time, Necessary APP has a good user experience and provides users with really useful health management services, which is also one of the important reasons for its success.