Yuejingapp.com operates in the health and wellness market, specifically targeting individuals and couples planning for pregnancy. The company offers a comprehensive preconception planning application that helps users track their menstrual cycles, predict ovulation periods, and monitor body temperature. The app uses smart technology to predict the beginning of the next period, ovulation period, and the probability of conception based on the menstrual and physical data entered by the user. It features Bluetooth-enabled body temperature testers that automatically sync records to the app, providing accurate predictions and alerts regarding fertility windows. The business model is primarily app-based, generating revenue through premium subscriptions and in-app purchases of advanced features and tools. The app serves a niche market of individuals seeking to optimize their chances of conception through data-driven insights and personalized planning tools.

Keywords: preconception, ovulation prediction, menstrual tracking, body temperature syncing, fertility, pregnancy planning, health app, Bluetooth-enabled, smart technology, premium subscriptions.