Where is my data stored?
Entirely on your device. Fern has no account and no server — see the
Privacy Policy for the full picture.
I switched phones / reinstalled Fern — where did my history go?
Since everything is stored locally, fasting history doesn't currently
transfer between devices or survive a reinstall. If you're subscribed to
Fern+, use Restore Purchases in Settings to bring your
subscription back — that part is tied to your Apple ID, not the device.
How do I cancel or manage Fern+?
Through your Apple ID subscriptions, the same as any App Store
subscription: Settings app → your name → Subscriptions, or directly from
Fern's own Settings tab via "Manage subscription."
Is the fasting/health guidance in the app medical advice?
No — it's general wellness information, not medical advice, and doesn't
replace guidance from a doctor. Fern says this directly before you start,
especially if you mentioned a health condition during setup.
Does Fern connect to Apple Health?
Only if you turn it on in Settings — it's never requested automatically.
When connected, Fern reads (never writes) your weight and sleep data to
show trends alongside your fasting history.