Privacy Policy

Last updated: 16 September 2026

In plain English: we collect the minimum needed to make the app work (an anonymous account so your progress isn't lost, and — if you enable it — your email via Apple / Google Sign-in). In CycleSync you also enter cycle and symptom information, which is health data — we treat it as sensitive, use it only to run the app for you, and never use it for advertising. We don't sell your data.

Who we are

This Privacy Policy applies to the mobile applications and websites operated by Deep Blue ("Deep Blue", "we", "us", or "our"). Deep Blue is a trading name of SwiftBee Ltd, a company registered in the United Kingdom. Our current apps include Walking Tai Chi for Seniors, Military Calisthenics: Women, and CycleSync. This policy applies to all of them collectively (the "Services").

Information we collect

We only collect what the app needs to function:

Account identifier. When you first open the app we create an anonymous account for you (a random ID) so we can save your plan progress without asking you to sign up. If you choose to sign in with Apple or Google, we also store the email address they return so you can restore your progress on another device.
Practice data. Sessions you complete, day of your plan, duration, and general playback events (so we know videos are loading correctly). In our exercise apps — Walking Tai Chi for Seniors and Military Calisthenics: Women — no sensor, health, or heart-rate data is collected. Cycle tracking in CycleSync is covered separately below.
Subscription status. Whether you have an active subscription, as reported by the App Store or Google Play. We do not receive your payment card details — those stay with Apple / Google.
Diagnostic data. Basic crash and error logs, which help us find bugs. These do not identify you personally.

Cycle and health data (CycleSync only)

CycleSync is a cycle tracking app, so it necessarily handles information about your health. This section applies only to CycleSync, and it takes precedence over the general description above wherever the two differ.

What you enter. Period start and end dates, cycle length, flow, symptoms, moods, notes, and any other entries you choose to log. You decide what to record — every field is optional, and the app works with only the dates you give it.
What we derive. Predicted period, fertile window, and cycle-phase estimates, calculated from the entries above so the app can show them back to you and send the reminders you have switched on.
Apple Health / Google Fit. We read or write cycle data to these services only if you explicitly turn that on, and only the categories you grant. You can revoke that permission at any time in your device settings without affecting the rest of the app.

Legal basis. Under UK and EU GDPR, cycle and symptom entries are special-category data concerning health (Article 9). We process them on the basis of your explicit consent, which you give when you choose to log them and can withdraw at any time by deleting the entries or your account. Withdrawing consent does not affect processing carried out before you withdrew it.

What we never do with it. We do not sell cycle data, share it with advertisers or data brokers, use it for advertising, profiling, or marketing, or disclose it to employers, insurers, or any other third party for their own purposes. It is not used to train machine learning models. The only parties that touch it are the infrastructure providers listed below, acting on our instructions, and only so the app can store and sync your entries.

Disclosure to authorities. We will disclose cycle data in response to a legal demand only where we are satisfied it is valid and binding on us in the United Kingdom, and we will narrow, challenge, or resist any demand we consider overbroad or unlawful. Where we are legally permitted to tell you about a demand for your data, we will.

Deleting it. You can delete individual entries in the app at any time. Deleting your account removes your cycle history from our live systems; encrypted backups are overwritten on their normal rotation within 30 days. See Data retention below.

How we use it

To run and improve the Services.
To save your plan progress and streaks across devices you sign into.
To respond to your support emails.
To comply with legal obligations (for example, tax records).

We do not sell your personal information, and we do not use it for third-party advertising.

Service providers we rely on

The Services are built on a small number of trusted infrastructure providers who process data on our behalf under written contracts:

Google Firebase — authentication, database, hosting, crash reporting, and push messaging.
Mux — video streaming for the exercise clips.
Apple & Google — for authentication and in-app subscription billing on their respective platforms.

Data retention

We keep your account, practice data, and — in CycleSync — your cycle history for as long as you use the app, so your records and predictions stay available to you. If you'd like your data deleted, email us at admin@swiftbee.co.uk from the email associated with the account and we'll erase it within 30 days, subject to any legal record-keeping obligations.

Your rights

Depending on where you live (UK GDPR, EU GDPR, California CCPA, and similar laws) you have the right to access, correct, delete, or receive a copy of your personal information, and to object to certain processing. To exercise any of these rights, email us at admin@swiftbee.co.uk.

Children

The Services are not directed to children under 13, and we do not knowingly collect information from anyone under 13. If you believe a child has provided us with data, please contact us and we will delete it.

International transfers

Our providers may process data in countries other than the one you live in (including the United States). Where required, we rely on standard contractual clauses or equivalent safeguards.

Changes to this policy

We'll post any changes to this page and update the "Last updated" date at the top. Material changes will also be surfaced in the app.

Contact us

Questions about this policy? Email admin@swiftbee.co.uk.