Train Smarter.
Dive Deeper.
CO₂ & O₂ tables, breath hold training, real-time heart rate from Apple Watch, personalized plans, and progress tracking — everything you need in one app.
Everything You Need to Excel
From beginner breath holds to advanced apnea training — Apnio adapts to your level and helps you progress safely.
CO₂ & O₂ Tables
Professional apnea training tables with progressive intervals. Customize rounds, durations, and rest periods.
Heart Rate Tracking
Real-time heart rate monitoring during training via Apple Watch. Track avg, max BPM, and HR zones.
Apple Watch App
Standalone Watch companion with haptic guidance. Train without your phone — your wrist does it all.
Progress Analytics
Track improvements over time with detailed charts. See breath hold trends, HR recovery, and streaks.
Personalized Plans
AI-generated multi-week training plans tailored to your level. Structured progression for real results.
Square Breathing
Box breathing exercises with customizable phase durations. Perfect for relaxation and dive preparation.
Session History
Complete log of all trainings with detailed metrics. Export to CSV and filter by type or date range.
Share Cards
Beautiful training summary cards with real diving backgrounds. Share your achievements on social media.
How It Works
Start improving your breath-hold in minutes. No complicated setup — just download, choose, and train.
Download the App
Get Apnio free on iOS today (Android coming soon). Set up your profile with your current breath-hold level and training goals.
Choose Your Training
Pick from CO₂ tables, O₂ tables, breath hold tests, square breathing, or let the app create a personalized plan for you.
Train with Real-Time Guidance
Follow on-screen timers and audio cues. Connect your Apple Watch for live heart rate monitoring during sessions.
Track Your Progress
View detailed session history, personal bests, and progress charts. Watch your breath-hold times improve over weeks.
Six Ways to Train
Whether you are a beginner or a competitive freediver, Apnio has the right training mode for you.
CO₂ Table
8 roundsProgressive breath holds with decreasing rest. Builds CO₂ tolerance for longer dives.
O₂ Table
8 roundsIncreasing breath holds with constant rest. Trains your body to use oxygen more efficiently.
Square Breathing
Custom phases4-phase box breathing for deep relaxation. Inhale, hold, exhale, hold — in equal durations.
Breath Hold Test
Single effortMax effort single breath hold with heart rate tracking. Test your limits and track progress.
Custom Tables
Your designCreate your own training tables with custom round times. Full flexibility for advanced divers.
Personalized Plan
Multi-weekMulti-week structured plans generated for your level. Progressive overload for systematic improvement.
Apnea Tables for Freedivers
Learn how to properly structure your CO₂ and O₂ training tables with this comprehensive guide.
Every Dive, Remembered
Log open water and pool sessions with discipline, depth or distance, SpO₂, photos, and GPS — pool and depth disciplines both covered.
Every Discipline, Tracked Correctly
Adaptive DRY / POOL Theme
Cool, focused palette that carries through into the water.
The whole app repaints instantly when you switch between topside and in-water training.
Blue Hole, Dahab
Jul 28, 2026
Municipal Pool
Jul 21, 2026
Dive Site Map
Every logged dive with GPS drops a pin — see everywhere you've trained.
See Yourself Improve
Every session feeds your stats — breath hold trends, training mix, and streaks, all in one view.
+38%
CO₂ tolerance, 12 weeks
24 days
Current streak
146
Sessions logged
Weekly Avg Breath Hold
Last 8 weeks, this training cycle
Training Mix
Share of sessions by type, this month
Latest from the Deep
Stay up to date with the latest freediving news, events, and stories from around the world.
Molchanovs Freediving Is Hiring A Social Media Manager
Molchanovs Freediving is seeking a new Social Media Manager to join its team, drive community engagement and share its passion for freediving worldwide.
Enchante Gallardo Becomes Second Woman To Dive FIM World Record
USA freediver Enchante Gallardo tied Ukraine's Nataliia Zharkova's freediving world record in the Free Immersion (FIM) discipline at this month's Asian Freediving Cup in Panglao, Philippines.
Kirk Krack To Be Featured In Upcoming Documentary ‘Air Hunger’
Freediving instructor and consultant Kirk Krack will be featured in the upcoming documentary "Air Hunger."
5 Questions Every Non-Freediver Asks (and the Answers!)
Curious about freediving but not sure where to start? We answered the five questions non-freedivers ask most, from ear pain to blackouts to whether you really need a course.
How to Choose the Right Dive Computer for You
Buying your first dive computer is a major step for any scuba diver or freediver. Learn what features matter, what to avoid, and why proper training helps you get the most from your investment.
Vitomir Maricic To Be Inducted Into International Sports Hall of Fame
Croatian freediver Vitomir Maricic has been announced as a member of the International Sports Hall of Fame Class of 2026.
News sourced from DeeperBlue.com · Updated daily
Start Training Today
Download Apnio for free. 30-day Pro trial included — unlock all features and train like a champion.