Last updated: 16 May 2026
STAmaster is a freediving Static Apnea training app for iOS. This policy explains what data the app collects, how it is used, and your rights.
Breath-hold durations, personal bests, contraction onset times, session notes, training table configurations, and onboarding preferences are all stored locally on your device using SwiftData.
Your data stays on your device. If you back up your iPhone, your STAmaster data is included in the backup.
With your explicit permission, STAmaster reads the following from Apple Health for training readiness:
Real-time heart rate during training sessions is provided by Bluetooth HR monitors, Apple Watch, or a connected pulse oximeter — not from HealthKit. Health data is never uploaded, transmitted to any server, or shared with any third party.
When you pair a Lepu PC-60FW (or compatible) pulse oximeter, STAmaster reads SpO2, pulse rate, and perfusion index directly over Bluetooth Low Energy. Samples are stored locally with the rest of your training data and are never written back to Apple Health (sensor lag would pollute Health app data) and never uploaded anywhere.
STAmaster requests Bluetooth permission only to connect to heart rate monitors and pulse oximeters that you explicitly pair. The app does not scan for or track unrelated Bluetooth devices.
STAmaster is currently completely free with no in-app purchases. All features are available to every user at no cost.
STAmaster contains no third-party SDKs, analytics services, or advertising networks. There is no external communication with any server.
STAmaster requests permission to read:
These are used solely for the training readiness score. Real-time heart rate during sessions comes from Bluetooth HR monitors or Apple Watch, not HealthKit.
You can revoke these permissions at any time in Settings > Privacy & Security > Health > STAmaster.
The app uses background audio mode to keep the timer running when your screen locks. It only plays coaching cues and does not record audio.
All data is stored exclusively on your device. To delete all STAmaster data:
STAmaster is rated 4+ and does not knowingly collect data from children under 13. Breath-hold training is a physical activity; all users should seek medical advice before training.
Freediving and breath-hold training carries inherent risks. STAmaster enforces a mandatory buddy-check before any wet static (in-water) training session. Never train breath-holding alone in water. This app is a training aid, not a safety device.
We may update this policy from time to time. The "Last updated" date at the top will reflect any changes. Continued use of the app after changes constitutes acceptance of the updated policy.