STAmaster
Train smarter, hold longer. Your personal Static Apnea coach.
Train smarter, hold longer. Your personal Static Apnea coach.
Built for freedivers at every level. All features are completely free.
Millisecond-accurate timing with real-time contraction marking, voice coaching cues, and background mode so your screen can stay off.
Full library of training tables for CO2 tolerance and O2 extension. Create custom tables or pick from a curated library by level.
Unlimited session history, heart rate charts, and performance trends. See your improvement over weeks and months.
Personalized training plans that adapt to your level. Post-session analysis with actionable tips and plateau detection.
Real-time heart rate via Apple Watch or Bluetooth HR monitors. Morning HRV for training readiness. Full Apple Health sync.
Mandatory buddy check for wet static training. Because the #1 rule in freediving is: never train alone in water.
Every feature. No paywalls. No subscriptions. No catch.
Last updated: 26 February 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.
If you have iCloud enabled, Apple may sync this data to your private iCloud account under Apple's own Privacy Policy. STAmaster has no access to your iCloud account.
With your explicit permission, STAmaster reads the following from Apple Health:
This data is read solely within the app to display training readiness and biometric overlays. It is never uploaded, transmitted to any server, or shared with any third party.
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:
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.
Having trouble or have a question? We're here to help.
Email us at support@code3.io
Yes, STAmaster is completely free. Every feature is included — no paywalls, no subscriptions, no hidden costs. Just download and start training.
Absolutely. Apple Watch and Bluetooth HR monitors are optional. The core timer, tables, and coaching features work on iPhone alone.
If iCloud is enabled on your device, your training data syncs automatically via iCloud. The data never leaves Apple's ecosystem.
Yes. Dry static (on land) does not require a buddy check. The buddy-check safety prompt only appears for wet static sessions.
STAmaster requires iOS 17 or later.