Ontime: Fasting Circadian is a lifestyle app that focuses on health and fitness habits, emphasizing the importance of timing in daily routines. Developed by Circadian Biosystems Inc, this free program offers a paid-subscription service tailored for health and performance improvement. The app encourages users to establish daily habits related to health, sleep, fasting, activity, and light, aiming to create a routine that enhances overall well-being based on scientific principles.

The app integrates world-class research on fasting and circadian rhythms, drawing inspiration from the work of renowned researcher Dr. Satchin Panda. By providing simple rules for fasting and meal timing, Ontime aims to make health improvements achievable through realistic goals and customizable routines.