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 or Android. 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.
Latest from the Deep
Stay up to date with the latest freediving news, events, and stories from around the world.
Stanislaw Odbiezalek Breaks His Own Guinness World Record For Walking Underwater
Polandish freediver Stanislaw Odbiezalek has broken his current men's Guinness World Record in walking underwater.
2026 UK Go Diving Show: Truly Incredible!
The 2026 Go Diving Show wrapped after delivering another stunning performance with record breaking crowds.
Wetsuit Company 7TILL8 To Close Its Doors
Custom wetsuit company 7TILL8 announced this week it was closing down after eight years.
Review: Apneo – Apnea Stamina Trainer App
World Champion Florian Dagoury's Apneo app uses AI-personalized coaching to make static training engaging, progressive, and surprisingly enjoyable - even for freedivers who've avoided STA for years.
Go Diving Show 2026 Opens This Weekend at NAEC Stoneleigh
The GO Diving Show 2026 returns to NAEC Stoneleigh on 28 February–1 March, bringing four speaker stages, 10,000 sqm of exhibitors, exclusive show deals, travel operators and major door prizes.
4 Types of Freediving Students That Drive Instructors Crazy
Ever wonder what makes a freediving instructor's eyes twitch behind their masks and teeth grind against their snorkels? If you're about to take your first freediving course, find out how to avoid annoying your instructor.
News sourced from DeeperBlue.com · Updated daily
Start Training Today
Download Apnio for free. 7-day Pro trial included — unlock all features and train like a champion.