FastFlex

FastFlex helps you track your fasting routine and weight over time with a simple timer, clear goals, and an easy-to-review history. CHOOSE YOUR FAST Select a 12-, 14-, 16-, 18-, or 20-hour fasting goal, or set a custom duration. Adjust your start and end times before beginning. Follow your remaining time and progress, stop early and save, or reset to start again. REVIEW YOUR PROGRESS Use the achievement calendar and fasting history to review completed and stopped fasts. Add or edit past sessions and view your fasting totals and average duration. TRACK WEIGHT AND BMI Record weight in pounds or kilograms, review changes over time, and confirm your height to calculate BMI. MAKE IT YOUR ROUTINE Choose optional fasting completion alerts and start reminders for the days and time that suit you. Export fasting and weight history as separate CSV files. GET STARTED WITH CONFIDENCE A new welcome guide explains how to use FastFlex and how fasting may help some people reduce calorie intake. Revisit the guide in Settings whenever you need it. Designed for iPhone and iPad, with scrollable screens and support for larger text. Your fasting and weight records are stored locally on your device. No account is required. FastFlex is a tracking tool, not medical advice. Fasting is not suitable for everyone and does not guarantee weight loss. Consult a healthcare professional before fasting if you have a medical condition or take medicines affected by food intake.