freefall: Freediving & Apnea

freefall is a dedicated freediving apnea trainer and customizable breath-hold table companion designed for freedivers, spearfishermen, and aquatic athletes.

Build, customize, and execute personalized CO2 tolerance and O2 hypoxia tables with crystal-clear voice guidance, immersive aquatic caustics visual feedback, and zero online distractions.

Whether you are preparing for your next depth certification, working on static apnea (STA), or expanding your dry-land breath-hold capacity, freefall gives you total control over every breathing stage.

KEY FEATURES:

• Precision Apnea Tables:
- CO2 Tolerance Tables: Condition your body to tolerate rising carbon dioxide levels and delay the urge to breathe.
- O2 Hypoxia Tables: Adapt your mind and muscles to operate comfortably under diminishing oxygen reserves.
- Custom Tables: Build fully tailored round-by-round routines with custom preparation, hold, and recovery intervals.

• Intelligent Dual-Voice Guidance:
- Stay completely relaxed with your eyes closed during breathe-up and breath-hold phases.
- Crystal-clear voice cues announce stage transitions, countdowns, and safety checkpoints.
- Choose between Calm and High-Visibility audio engines to suit your training environment.

• Dynamic Visual Immersion:
- Clean, dark-mode aquatic interface with smooth GPU-accelerated caustic wave simulations.
- High-contrast visual cues that keep essential countdowns readable at a glance without breaking your focus.

• 100% Pure Offline & Privacy-Focused:
- Operates completely offline without requiring internet access or network permissions.
- No ads, no tracking SDKs, no accounts, and no data collection. Your training logs and sessions stay strictly on your local device.

• Universal Language Support:
- Seamlessly switch between English and Simplified Chinese for both interface text and voice guidance independently.

TRAIN SAFELY:
Dry-land apnea training only. Never practice breath-holding in water without certified direct one-on-one buddy supervision. Never practice hyperventilation.

Recent changes:
rebranding from "breathe timer" to "freefall"
big performance update and UI change
new app icon