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.