Walk Under the Sun

This App requires an Apple Watch to track your time spent outdoors in daylight. Introduction: - Life is Never Too Long. "Walk Under the Sun" is a health management tool explicitly designed for those pursuing a high-quality, long, and healthy life. We are not just a step counter— we are an environment-aware intelligent tool that helps you regulate your circadian rhythm and improve sleep quality through natural light exposure. Core Features: - Sunlight Steps: Leveraging Apple Watch's ambient light sensing capabilities alongside global meteorological big data, we precisely distinguish between indoor walking and outdoor steps under the sun, filtering out nighttime and artificial light noise. - Quantify Sunlight Efficiency: Want to know how much natural light you’ve captured? We calculate the ratio of your "actual exposure time" to the "available daylight hours" of the day, providing scientific insights for your Vitamin D synthesis and deep sleep. - Comprehensive Body Composition Tracking: Seamlessly integrating your weight, body fat percentage, BMI, and muscle mass stored in Apple Health. Our long-term trend charts allow you to visualize the positive correlation between your outdoor walks and physical improvements. Why Choose Us?: - Privacy First: 100% of your health data is processed locally on your device. It is never uploaded to cloud servers, ensuring your privacy is fully protected. - Data Alignment: Highly consistent multi-dimensional timelines (Day, Week, Month, Year) deliver industrial-grade data accuracy.