Know your cycle. Predict your period.
Safr is a period and cycle tracker. Log your period and Safr learns your rhythm, predicting your next period, fertile window, and ovulation, and tracking the symptoms you care about. Want more precision? Add temperature data from Apple Health or a wearable for an extra layer of accuracy.
Your cycle at a glance
Periods, predictions & symptoms in one place
How Safr works
Start by logging your period, that's all Safr needs to begin. Everything else builds from there, and you're always in control of your data.
Log your period
Tell Safr when your period starts and stops. The more you log, the smarter your predictions get.
Track your cycle
Safr predicts your next period, fertile window, and ovulation from your history, and lets you log symptoms, flow, discharge, and ovulation (LH) tests.
Add temperature for accuracy (optional)
Connect Apple Health or a wearable like Oura to factor in your basal temperature shift and refine your fertile-window estimates.
Period predictions
Log your period and Safr predicts your next one, so you're never caught off guard.
Cycle & fertile window
See where you are in your cycle, with estimated fertile and non-fertile days.
Symptom & flow logging
Track symptoms, flow, discharge, and intercourse in a few taps.
Ovulation (LH) tests
Log LH tests to help pinpoint your surge and confirm ovulation.
Optional temperature layer
Connect Apple Health or a wearable like Oura to make your predictions more precise.
Private by design
Your cycle data stays on your device by default, and is never sold to anyone.
Your data, handled with care
Safr is a health-adjacent app, and we treat your information that way.
On-device first
Your cycle and health logs are stored on your device, not our servers.
Never sold
We do not sell your personal or health data to anyone.
Disconnect anytime
Turn off a connected source whenever you like; Safr stops importing.
Yours to export
Request a copy of your data at any time.
Yours to delete
Delete your account and data directly from the app.
Spelled out
Read our Privacy Policy for the full detail.