Zeit Calendar is a free iPhone app developed by ThisApp Inc. that aims to help users unlock the full potential of their health data and streamline the process of maintaining a healthy lifestyle. It is perfect for individuals with regular activity routines, specific health goals, dynamic schedules, fitness habits, and those preparing for races, expeditions, or competitions.

Zeit Calendar goes beyond time tracking and scheduling by providing users with tools to align their activities with their body's natural rhythms. By incorporating natural cues like daylight, temperature, exercise, and meal timings, known as "zeitgebers," Zeit Calendar enhances users' sleep quality, mental health, physical performance, and overall well-being. The name "Zeitgeber" is derived from the German words "Zeit" (time) and "Geber" (giver), signifying the app's purpose of giving time to exercise and wellness routines that foster long-term health and vitality.

The app is compatible with popular devices such as Apple Health, Garmin, Whoop, Fitbit, and Oura. With Zeit Calendar, users can transform their daily calendar with a range of health-first features. These include securely connecting their calendar with favorite health and fitness apps, organizing their time to improve health and fitness, adding smart events to the calendar that update with wearable results, and accessing a personalized AI Assistant.

Zeit AI, the AI Assistant, offers tailored fitness journey plans, meal suggestions, actionable health insights, and day-to-day calendar management. It provides personalized responses and proactive insights to keep users one step ahead on their health journey. With Zeit Calendar, users can unlock the full potential of their health data and achieve long-term health and vitality.