ZenDepth vs Spearo Apnea

Master your breath. Extend your limits. ZenDepth is a personalized apnea training app built for freedivers, spearfishers, surfers, and meditators who want to go further underwater. Set your baseline. Get a 12-session adaptive plan calibrated to your personal best. Track your progress through phases as your hold times grow. SMART TRAINING PLANS CO2 tables build your tolerance to high carbon dioxide. O2 tables train your body to use oxygen more efficiently. Every plan adapts to your current level and improves with you. GUIDED STRETCHING Expand your lung capacity and thoracic mobility with five science-backed stretching exercises — guided in real time with live cues. UNLOCK TECHNIQUES Master 20 breath-hold techniques progressively as you train — from Recovery Breathing to advanced Breath Packing. GAMIFIED MILESTONES Earn badges, conquer phases, and watch your guided streak grow. Training feels like progress, not a grind. TRAIN WITH FRIENDS Add friends by username and see how your personal bests stack up. A private leaderboard built for the freediving community. BEAUTIFUL BY DESIGN An underwater aesthetic that makes every session feel like a dive. Animated backgrounds, glass-morphic UI, and haptic feedback designed for focus and flow. ZenDepth is free to start. Unlock all training phases with a premium subscription after completing the first training phase. Terms of Use: https://zendepth.app/terms.html

Spearo Apnea is a standalone Apple Watch app for freediving and apnea training. Train with scientifically-designed breath-hold tables including CO2 Tolerance, O2 Deprivation, Square Breathing, Pranayama, Pyramid, and advanced protocols. Track your progress with real-time heart rate monitoring from HealthKit, SpO2 estimation, contraction counting, and an Apnea Score after every session. Level up through an XP system, unlock achievements, and sync your data across devices with Firebase.