Best FastOnce alternatives: apps like FastOnce: Fasting Timer

Auto Sleep Detector & Tracker

Identify sleep & nap patterns

Free

Automatically track sleep duration and patterns using your phone's sensors. Get personalized insights and recommendations to improve your rest without wearables or subscriptions. All your data stays securely on your device.

Cycle Cipher

Private Period Tracker

Free

Track your menstrual cycle and health details privately on your device. Log symptoms, moods, and personal health history without creating an account or seeing ads. Secure your data with optional PIN protection and create encrypted backups.