01
Who we are
Cykel is an Android period and cycle tracking application, developed by Abhishek M R, an independent developer. When this policy says "we", "us", or "Cykel", it refers to Abhishek M R as the developer of the Cykel app. You can reach us at feedback@cykel.in.
02
What information we collect
Your health and cycle data: none. Everything you log — period dates, flow, symptoms, moods, weight, notes and predictions — stays in an encrypted database on your device. We never receive, see, transmit, or store any of it. There is no account, no sign-up, and no email required to use the app.
Anonymous technical data: crash reports only. So we can keep the app stable, Cykel uses one Google service that collects anonymous, non-personal crash reports when the app malfunctions. There are no ads and no usage analytics. None of this includes your health or cycle data, your name, or your email. Full details are in section 06.
We operate no server that stores your personal data. Your cycle history cannot be accessed by us or anyone else — it lives only on your phone.
03
Where your data is stored
Everything you enter in Cykel — cycle dates, flow levels, symptoms, moods, notes, weight, predictions — is stored exclusively in a local database on your Android device. This database:
- Is encrypted at rest using AES-256 device encryption provided by Android
- Never leaves your device unless you explicitly use the export or backup feature
- Is deleted permanently when you uninstall the app or use the in-app "Delete all data" option
- Is protected by your device's biometric lock or PIN if you enable that feature in Cykel's settings
04
On-device AI assistant
The "Ask Cykel" assistant answers questions about your cycle using only the data you have logged. All inference happens entirely on your device using on-device logic — no queries, data, or results are ever sent to any AI cloud service, third-party API, or external server of any kind.
05
Backups and exports
Cykel lets you manually export your data as a file or back it up to a destination of your choice (for example, your personal cloud storage via your device's file system). These actions are entirely under your control:
- We do not initiate, schedule, or receive any backup
- We have no access to any file you export or back up
- If you back up to a third-party service, that service's own privacy policy governs the data you store with them
06
Third-party services
Cykel uses exactly one third-party service. It never receives your health or cycle data:
- Firebase Crashlytics (Google LLC) — when the app crashes, it sends an anonymous report with your device model, Android version, app version, and the technical stack trace, plus a random installation identifier. This helps us find and fix bugs. No health, cycle, or personal data is included.
Cykel contains no advertising SDKs and no analytics SDKs. It shows no ads and does not use your device's advertising identifier.
These services are governed by Google's Privacy Policy. If you download Cykel from Google Play, Google's Play Store terms also apply to that transaction.
07
Android permissions
Cykel requests only the minimum permissions needed to function:
- Notifications — to send period and ovulation reminders you configure. Reminders are generated locally; your cycle data is not sent anywhere to produce them.
- Biometric / device lock — to unlock the app using your fingerprint or PIN, if you enable app lock in settings.
- Internet — used only for the anonymous crash reports described in section 06. Your logged health data is never transmitted. Core tracking, predictions and the assistant all work offline.
Cykel does not request access to your contacts, camera, microphone, location, call logs, or any other sensitive permission.
08
Children's privacy
Cykel is a general health tracking app intended for a general audience and is not directed to children under 13. We do not knowingly collect personal information from children. The only data leaving the device is the anonymous technical data described in section 06, which contains no personal identity. Any health data a user logs stays on the device, where a parent or guardian can review or delete it at any time.
09
Your rights
Because all your data lives on your device and we hold none of it, you already have full control:
- To view your data — open the app at any time
- To export your data — use the Export option in Settings → Your Data
- To delete your data — use "Delete all data" in Settings, or uninstall the app
- To access your data elsewhere — export it in the provided format
There is no account to close and no server-side profile of your health data to delete. For the anonymous diagnostic data handled by Google, you can request deletion by contacting us at the email below.
10
Data retention
Your health and cycle data is retained on your device for as long as you keep the app installed, and is erased when you use "Delete all data" or uninstall Cykel. We hold none of it ourselves, so there is nothing for us to retain or delete.
The anonymous crash reports in section 06 are retained by Google according to its own schedule — typically around 90 days.
11
Changes to this policy
If we ever change this policy, the updated version will be published at this URL with a new effective date. If changes are material — for example, if a future version of the app were to collect any data — we will notify users via an in-app notice before the change takes effect.
We have no intention of changing the core principle: your data stays with you.
12
Contact
If you have any questions about this policy or about Cykel's approach to privacy, reach out at any time: