Cycle predictions
Period and cycle predictions calculated entirely on-device from your logged history. No cloud processing.
Private by design
Cyla
A period & cycle tracker that never leaves your phone. No account, no cloud, no servers — predictions, symptoms and Apple Watch temperature, all on-device.
On-device only
Apple Watch temperature
No account
One-time purchase
iPhone & iPad
Your cycle, at a glance
Everything you need in a couple of taps — log the day, read your predictions, and watch the picture get clearer the more you track. Nothing here is sent anywhere.
What it does
A complete cycle tracker — predictions, fertility windows, symptoms and export — built so your most intimate health data stays yours.
Apple Watch temperature
Reads wrist temperature via HealthKit to help confirm ovulation and improve prediction accuracy.
Daily symptom logging
Log symptoms, moods and notes each day. Everything stored locally, encrypted by iOS.
Fertility tracking
Fertility window estimates based on your cycle data and temperature trends. Available in premium.
Data export
Export everything as JSON anytime. Your data is yours — take it with you if you leave.
No account required
No email, no sign-up, no cloud sync. Open the app and start tracking immediately.
Private, not just promised
Most trackers ask for an account before you can log a single day, then sync your most intimate data to a vendor cloud. Cyla doesn't.
- All health data stored locally with iOS encryption.
- No accounts, no cloud, no servers.
- Apple Watch data via HealthKit — on-device only.
- Nothing to subpoena, nothing to breach, nothing to sell.
Who it's for
Cyla is for people who want a private period tracker, a private cycle tracking app, or a Flo alternative that does not begin with an account signup. It is especially relevant if privacy is not an abstract preference for you, but the main reason you are choosing a new health app.
No account-first workflow
You do not need to create an account just to log a cycle. That changes the feel of the product immediately.
On-device privacy story
Designed to keep sensitive cycle data on the device instead of sending it to a vendor-controlled cloud by default.
Apple ecosystem fit
Apple Watch temperature integration makes Cyla especially relevant for iPhone users who already rely on Apple health features.
Export without lock-in
Export support means your data stays portable rather than trapped in one app.
Built for trust
On-deviceAll data stays local, encrypted by iOS.
Apple WatchTemperature integration via HealthKit.
No accountNo sign-up, no cloud, no tracking.
Frequently asked questions
Is Cyla private?
Privacy is the main point: no account requirement, no cloud-first model, and sensitive health data kept on-device.
Does Cyla work with Apple Watch?
Yes. Apple Watch temperature integration is one of the app's core differentiators for iPhone users.
Compare with Flo or Clue?
Read Cyla vs Flo vs Clue for a privacy-focused comparison.