Holdfast: Freedive Trainer
Apnea & breath-hold tables
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
Take a quick breath check and get CO₂ and O₂ tables built for you — free. Now with Apple Watch training, sharing, and a one-time Lifetime unlock.
Holdfast is a calm, focused breath-hold trainer for freedivers, spearos, and anyone learning to sit comfortably with the urge to breathe. Run proven CO₂ and O₂ tables on your iPhone — or entirely on your Apple Watch, screen-off and haptic-guided — so every session feels effortless.
WHY HOLDFAST
- CO₂ tables to blunt the urge to breathe; O₂ tables to extend your hold.
- Guided sessions with gentle haptic and audio cues — eyes closed, no screen needed.
- Built for Apple Watch: start, run, and finish a full session from your wrist, screen-off, driven by taps.
- Progress that motivates: history, streaks, personal bests, and clean charts.
- Heart rate during holds via Apple Health (optional).
- 100% offline. No account, no sign-up, ever.
FREE FOREVER
- The full CO₂ and O₂ table trainer, on iPhone and Apple Watch.
- Session history, streaks, and personal bests.
HOLDFAST PREMIUM
- Custom table builder — design your own ramps.
- Training plans — structured, progressive programs.
- Advanced analytics — deeper trends and recovery insight.
TRAIN SAFELY
Holdfast is for dry training only. Never practice breath-holding in or near water alone, and never hyperventilate. Shallow-water blackout gives no warning. Stop immediately if you feel dizzy, lightheaded, or tingling, and talk to a doctor before starting breath-hold training if you have heart, lung, blood-pressure, or pregnancy concerns.
PRIVATE BY DESIGN
Everything runs on your device. No account, no tracking; your health data stays in Apple Health.
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Holdfast Premium is an auto-renewing subscription.
- Monthly $3.99 / Annual $29.99, with a 7-day free trial (USD; prices vary by region).
- Payment is charged to your Apple ID at confirmation of purchase.
- It renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period; your account is charged within 24 hours prior to renewal.
- Manage or cancel anytime in your App Store account settings.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: [your privacy URL]
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Built for you — free.
• Quick breath check: measure one relaxed hold and we'll tailor your CO₂ and O₂ tables to you, automatically. No subscription needed.
• Train from your wrist: run full sessions on Apple Watch — screen-off and haptic-driven.
• Share your progress: new session cards for personal bests and streaks.
• Lifetime unlock: prefer to pay once? Premium is now available as a one-time purchase alongside Monthly and Annual.
• Now in Spanish.
Plus refinements across the home screen and training flow. Train dry, stay relaxed, and stop at the first urge to breathe.
The developer, Jorge Bustamante, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jorge Bustamante
- Size
- 4.2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English and Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Holdfast Premium — Annual $29.99
- Holdfast Premium — Monthly $3.99
- Copyright
- © Jorge Bustamante