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* Fixed tiny bugs.
CO2 & O2 Breath Hold Training
rain your breath hold the calm, safe way, with an otter as your dive buddy. Otter Freedive Apnea turns freediving practice into a guided ocean adventure. Measure your comfort baseline, train with CO₂ and O₂ tables built around it, and learn the fundamentals in short lessons, all on dry land and at your own pace. Whether you are a beginner, an experienced freediver, a spearfisher or a scuba diver, you always know what to practice today. KEY FEATURES • Adventure Path — Four ocean chapters, from Shallow Start to Return from the Abyss. Short lessons on relaxed breathing, the dive reflex, diaphragm contractions and focus, with a safety guide in every chapter. • Personalized CO₂ & O₂ Tables — Take the comfort baseline test and your tables adapt to it. Shrinking rests build CO₂ tolerance; longer holds build adaptation to low oxygen. • Guided, Safer Sessions — Safety check, settling breaths, final breath, hold, then recovery breathing and an effort rating. Log contractions or end any hold early with a tap. • Progress You Can See — Best hold, session history, monthly calendar and yearly heatmap, plus XP, levels and achievements. • Daily Quests & Streaks — Daily goals, quests, weekly challenges and Streak Freezes. Spend shells on outfits for your otter in the Otter Shop. • Widgets, Live Activities & Dynamic Island — Follow your streak and your session from the Home Screen and Lock Screen. • Relaxation Breathing & Reminders — Guided breathing practice and gentle daily reminders to build the habit. SAFETY FIRST Breath-hold training carries a risk of blackout. Practice only on dry land, sitting or lying down in a safe place. Never hold your breath in water, in a bath or while driving, avoid hyperventilation, and stop right away if you feel dizzy or unwell. This app is a training aid, not a medical device, and does not replace a qualified freediving instructor.=