Support

Cycle Diary is a private period tracker for iPhone. There is no account and nothing to sign up for — what you enter stays on your device, and syncs only to your own private iCloud storage.

Contact us

The fastest way to reach us is email: sinastudio.house@gmail.com.

It helps if you mention your iOS version and what you were doing when the problem happened. We read every message and reply as soon as we can.

Common questions

Do I need an account?

No. Cycle Diary has no accounts, no sign-up and no password. Open the app and start tracking.

Where is my data kept?

On your device. If you are signed in to iCloud, your entries also sync to your own private iCloud storage under your Apple Account, encrypted so that only you can read them. They never reach a server we operate, and we cannot see them.

I reinstalled the app and my entries are gone.

Entries come back on their own if iCloud sync was working when you made them and you are signed in to the same Apple Account. Give it a minute after the first launch.

Open Settings → Backup and look at the iCloud sync row. On means your entries are reaching iCloud. Off means they were only ever on that one device — which is why the app also offers a CSV export.

How do I keep my own copy?

Settings → Data → Export data writes a CSV file wherever you choose. Import data on the same screen reads one back, either merging it with what is already there or replacing everything.

A CSV holds real health information, so keep it somewhere private.

I forgot my app lock PIN.

The PIN is stored in the iPhone's Keychain and nobody can recover it — not us either. If you saved a hint when you set the PIN, the lock screen has a See hint button.

Otherwise the only way back in is to delete the app and install it again. If iCloud sync was on, your entries return afterwards; the PIN does not.

Can I change the language?

Settings → Language. Cycle Diary is available in 65 languages. It asks which one you want during setup and never changes it on its own, so changing your phone's language leaves the app as it is.

How do I delete everything?

Settings → Data → Delete all data. It asks you to type DELETE first, because it cannot be undone. Deleting the app also removes the copy on your device.

Does the app show ads or track me?

No. There is no advertising, no analytics and no tracking of any kind. The app contains no networking code at all — the only thing it talks to is Apple's iCloud, on your own account.

Are the predictions medical advice?

No. See the disclaimer below.