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Getting Started
How do I start a fast?
Open the app and tap the Track tab. Press "Start Fasting" to begin. The timer starts immediately and your progress ring will update in real time.
How do I choose a fasting plan?
On the Track screen, tap the plan selector and pick one of 16 presets, from 12:12 up to 72 hours. You can switch plans during an active fast without losing progress. To change the plan new fasts start with, go to Settings → Default Fasting Plan.
Do I need to create an account?
No. Zeti works completely offline and requires no account. All your data stays on your device.
Fasting & Metabolic States
What are the metabolic states shown in the app?
Zeti shows 10 stages based on elapsed fasting time: Blood Sugar Rise (0–2h), Blood Sugar Decline (2–5h), Blood Sugar Normalization (5–8h), Gluconeogenesis (8–12h), Fat Burning (12–18h), Ketosis (18–24h), Autophagy (24–48h), Growth Hormone Boost (48–54h), Insulin Sensitivity (54–72h) and Immune Regeneration (72h+). Stages are estimates for wellness tracking, not medical measurements.
What is Extended Fasting Mode?
Extended Fasting Mode allows the timer to run past your goal duration without automatically stopping. Enable it in Settings if you plan fasts longer than your default plan. Always consult a healthcare professional before attempting extended fasts.
Can I pause a fast?
The timer runs continuously in the background. You can end a fast at any time by tapping "End Fasting" on the Track screen — the session will be saved to your Journal.
Journal & Analytics
How do I log my mood or weight?
While a fast is active, tap the "Log Mood" or weight entry buttons on the Track screen. You can also edit entries after the fact by tapping a session in your Journal.
What does the consistency calendar show?
The calendar in the Charts tab shows days where you completed a fasting session. Darker tiles indicate longer fasts. It helps you visualise your weekly and monthly consistency at a glance.
How is my success rate calculated?
A session counts as successful if you reached or exceeded your goal duration. Your success rate in the Journal header is the percentage of sessions where you hit your goal.
Data & Privacy
Where is my data stored?
All data is stored locally in a SQLite database on your device. Nothing is uploaded to any server. See our Privacy Policy for full details.
How do I delete all my data?
Go to Settings → Reset All Data. This permanently deletes all fasting history, journal entries, mood logs, and preferences from your device. This action cannot be undone.
Is my data backed up?
Zeti has no cloud backup. Your device's own backup (Google or iCloud) may include app data. To make your own backup, go to Settings → Data Management and export a JSON file; you can import it later on the same or a new device. Your journal can also be exported as CSV.
Troubleshooting
The timer stopped in the background — what happened?
The timer continues running in the background, but your device's battery optimisation may have restricted the app. On Android, go to Settings → Battery → App permissions and allow Zeti to run unrestricted. On iOS, ensure Background App Refresh is enabled for Zeti.
I'm not receiving fasting reminders.
Check that notifications are enabled for Zeti in your device's Settings. In the app, go to Settings → Notification Settings to configure your reminder schedule.
The app crashed. How do I report it?
Crash reports are sent automatically through Firebase Crashlytics and never include your journal content. To report a specific issue, email support@zeti.app with your device model, OS version and what happened.
Want to delete your data?
You can reset all app data instantly from within the app, or submit a formal deletion request.
Data Deletion Request →