CFast Support
Need help? We’re here.
Email us and we’ll usually reply within 1–2 business days.
healthydietdev@gmail.com
Getting started
CFast helps you track intermittent fasting, weight and body measurements, water intake, and healthy habits.
- Start a fast: Open the Fasting tab and tap Start Fasting. The timer shows your elapsed time and body-state stages.
- End or edit a fast: Tap End Fasting to finish, or tap the time card / edit icon to change your start and end times.
- Choose a plan: In the Plans tab, pick a daily (e.g. 16:8), weekly, or flexible day-wise plan.
- Track progress: Use the Insights tab and the Weight & Body Measurements screen to log weight, measurements, BMI and water.
Frequently asked questions
My reminders / notifications aren’t showing
CFast uses reminders for fasting stages, “almost there,” and fast-complete alerts. To receive them, allow notifications: open the iOS Settings app → CFast → Notifications → turn on Allow Notifications. You can also toggle fasting and body-state reminders inside the app under Settings.
How do I change my fasting start or end time?
On the Fasting screen, tap the start/end time card (or the pencil/edit icon). Adjust the time and save — your reminders update automatically. For weekly plans, tap the edit icon on any upcoming day.
What’s the difference between Daily, Weekly and Flexible plans?
Daily repeats one fasting window (like 16:8) each day. Weekly schedules a fasting window for each of the next several days. Flexible (day-wise) lets you pick specific days to fast. Free plans are available; some longer plans and challenges are part of Premium.
How is my weight, BMI and measurement data stored?
Your health and fitness data (weight, measurements, height, age, fasting history, water) is stored only on your device. CFast has no account and does not upload this data to our servers. Deleting the app removes this data from your device.
How do challenges work?
Open the Challenges screen and choose a challenge (7, 14, 21 or 28 days), then tap Join. The 7-day challenges are free; the 14/21/28-day challenges are part of Premium.
Recipes or content won’t load
Recipes are downloaded from the internet, so make sure you have an active connection. If a list looks empty, close and reopen the app, or try again on Wi-Fi.
Subscriptions & billing
Restore a purchase
If you already subscribed (e.g. on a new device), open the app’s paywall and tap Restore Subscription, or go to Settings → Restore Subscription.
Manage or cancel your subscription
CFast subscriptions are billed through your Apple ID and are managed by Apple:
- Open the iOS Settings app and tap your name at the top.
- Tap Subscriptions.
- Select CFast, then change or Cancel Subscription.
Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Refunds are handled by Apple at reportaproblem.apple.com.
Health & safety
CFast provides general wellness and intermittent-fasting information and tools. It is not medical advice. Consult a qualified healthcare professional before starting any fasting, diet, or exercise program — especially if you are pregnant, breastfeeding, under 18, or have a medical condition.
Still need help?
Email healthydietdev@gmail.com with your question. To help us resolve it faster, include your device model, iOS version, and a short description (and a screenshot if relevant).
See also our Privacy Policy.