Last updated: July 7, 2026
ELEMENT | 08 ("the App") is a freediving training and logging application. The App works fully offline and needs no account; an optional free account adds cloud backup and coach↔athlete features. This policy explains what data we collect, how it is used, where it is stored, and your rights under the EU General Data Protection Regulation (GDPR).
The data controller responsible for your data is the operator named in our Impressum. For any privacy question or request, contact apnea.advantage@gmail.com.
By default, your training data stays on your device: the App does not require an account and works fully offline. Data leaves your device only when you use a feature that needs it: in-app purchases, and, if you choose to create an account, cloud backup and coach↔athlete sync (see Cloud Account & Sync below).
The App uses Bluetooth Low Energy (BLE) to connect to pulse oximeters and dive devices for real-time monitoring during training. BLE is only active when you initiate a scan or connect to a device, and communicates only with your own paired devices. No BLE data is transmitted to external services.
Accounts are optional: you can use the entire App without one. If you create a free account, you sign up with an email address and a password, and we store your email, a display name you choose, and a coach/athlete role flag. When you sign up you are asked to agree to this Privacy Policy and our Terms. We use Supabase, a hosting and authentication provider, to operate accounts; Supabase acts as our processor under a data-processing agreement.
With an account you can use these features. They are off until you turn them on:
You control these connections and can disconnect, or delete your account, at any time, which stops further sharing. Access is enforced at the database level (row-level security): a coach can only ever see data for athletes connected to them, and never another coach's athletes.
The App includes an optional AI assistant that answers questions about your own logged training and dive data in natural language. It is off until you open it, and the first time you use it you are asked to give explicit consent after a short summary of how it works. How your data is handled:
On-device data never leaves your device unless you use the cloud features above. Account and cloud data is stored on Supabase servers in the European Union (Frankfurt, Germany). The one exception is the optional AI assistant, which, when you use it, sends the data described under AI Assistant to Anthropic in the United States.
When you buy a subscription or a one-time purchase, the transaction is processed by Apple or Google. We use RevenueCat, a subscription-management provider, to verify, deliver, and restore your purchases. For this purpose RevenueCat receives your purchase history along with an app-generated identifier and a device identifier. This information is used only to provide the features you bought. It is not used to track you across other apps or for advertising.
The App uses no analytics services, advertising SDKs, or tracking pixels, and does not track you across other apps or websites. The only third parties are RevenueCat (purchases), Supabase (accounts and cloud storage, if you create an account), and Anthropic (only if you use the AI assistant), each described in this policy and used solely to provide the App.
We do not sell your data and never share it for advertising. Data is shared only as needed to provide the App:
Where the GDPR applies, we process your data on the basis of: providing the service you requested (Art. 6(1)(b)) for account and coaching features; your consent (Art. 6(1)(a)), which you give at sign-up and can withdraw at any time; and our legitimate interest in operating and securing the App (Art. 6(1)(f)). For the AI assistant, and specifically for any health-related figures it may include, we rely on your explicit consent (Art. 6(1)(a) and Art. 9(2)(a)), which you give before first use and can withdraw at any time by not using the feature.
You can exercise these rights at any time, directly in the App:
You also have the right to lodge a complaint with a data-protection supervisory authority.
On-device data is kept until you delete it or uninstall the App. Account and cloud data is kept until you delete your account, after which it is removed from our systems. Invite codes expire automatically. When you use the AI assistant, Anthropic retains the request only briefly for security purposes (see AI Assistant); we do not keep your conversations.
The App is not directed at children under 16. We do not knowingly collect data from children under 16; if you are under 16, use the App only with the consent of a parent or guardian.
We may update this Privacy Policy from time to time. Changes will be reflected on this page with an updated "Last updated" date.
If you have questions about this Privacy Policy, contact us at apnea.advantage@gmail.com.