Lifestack is an innovative productivity tool that integrates users' health data (such as wearable device data) and schedules to help users plan daily tasks based on their energy levels. It utilizes the human circadian rhythm to calculate energy levels, providing a visual energy curve and recommending optimal task execution times based on the user's health status and task priorities. This health data-driven intelligent time management method not only helps improve work efficiency but also prevents overwork and burnout, making it suitable for modern people seeking a balance between high efficiency and healthy living. Lifestack offers a free trial, and users can choose a suitable subscription plan based on their needs.