Terms of Use

Last updated: 13 November 2026

These terms cover your use of Cykie (“the app”), made by Cykie Labs. By using the app you agree to them. If you downloaded Cykie from the App Store, Apple's standard licence for apps (Licensed Application End User License Agreement) also applies.

Not medical advice

Cykie shows estimates based on what you log. Its predictions, insights and information are not a diagnosis, not medical advice and not a method of contraception. Every body is different; for health questions or concerns, talk to a doctor or other qualified health provider.

Your data

Everything you enter stays on your device, as described in the privacy policy. Because nothing is stored anywhere else, you are responsible for keeping backups (Settings › Your data › Export) if you want to keep your history when you change or lose your phone.

Purchases

Cykie works fully without paying. Tips and the optional Supporter subscription are a thank-you and unlock nothing. They are sold and billed by Apple (or Google on Android) under their terms; the Supporter subscription renews monthly until you cancel it in your store account settings, at least 24 hours before the end of the current month. Refunds are handled by the store.

Using the app

You may use Cykie for your own personal, non-commercial purposes. Please don't copy, modify, resell or reverse-engineer it, or use it in a way that breaks the law.

No warranty

The app is provided “as is”. Care goes into making it accurate and reliable, but there is no guarantee that it will be error-free or that predictions will be correct.

Limitation of liability

To the extent the law allows, Cykie Labs is not liable for any indirect or consequential loss arising from your use of the app, including decisions made based on its estimates. Nothing in these terms limits rights you have under consumer law that can't be limited.

Changes

If these terms change, the new version will be published here and the date above will change.

Contact

Questions? Email hello@cykielabs.com.