Harmony Timer vs O2

The round timer for every martial art. Boxing, BJJ, Muay Thai, MMA, kickboxing, karate, taekwondo, judo and wrestling, each one tap away, plus interval training, stretching and guided breathing for the rest of your session. Pick a format, tap Start, and follow the bell. Rounds and the Simple training and stretching timers are free. Harmony Timer Pro adds sectional workouts and stretches, guided breathing, and saved presets. QUICK START FOR EVERY MARTIAL ART Boxing, kickboxing, Muay Thai, MMA, BJJ rolls, judo randori, karate kumite, taekwondo, wrestling, heavy bag, shadowboxing and Tabata, with the round length, rest and number of rounds already set. Or set your own. Follow the start sound, the end-of-round gong, an optional 10-second warning and the break countdown. READ IT FROM ACROSS THE MAT Big digits in a bold color for every phase, turning amber in the last 10 seconds. Tap the timer for full screen. On iPhone Duo, fold it and stand it on its side like a ring clock; on iPad, prop it against the wall and run the class. KEEP YOUR PHONE LOCKED On supported iPhones, a Live Activity shows the session on the Lock Screen and in the Dynamic Island. With notifications allowed, the bells ring while the phone is locked, even without background music. Notification sounds follow your phone's Ring/Silent setting. Reopen the app to return to the running timer. TRAIN, THEN STRETCH Use Simple mode for a warm-up, one work period and a cool-down, or for a continuous stretch. Pro adds Sectional mode: work and rest sets for conditioning, or core, lower-body and upper-body phases for recovery. GUIDED BREATHING WITH PRO Follow an animated breathing circle for box breathing, 4-7-8 breathing or a pattern of your own, or sit with a self-guided meditation timer. EARN YOUR BELT Track sessions, training days and your streak on a calendar. Your in-app belt follows your training days in the last 30: reach black belt at 15. Finish a session with a summary you can share as an image. WHAT'S FREE • Rounds, including every Quick start format • Train and Stretch in Simple mode • Home, Progress, belts, streaks and session summaries • Lock Screen features on supported iPhones HARMONY TIMER PRO • Sectional training and stretching • Meditate, including guided breathing • Saved presets Existing subscribers keep full access. YOUR DATA No account and no ads. Your history, presets and settings are stored on your device. Harmony Timer is a timer and gives no medical advice; check with a doctor before you start a new exercise or breathing routine. SUBSCRIPTION Harmony Timer Pro is an auto-renewable subscription, billed monthly or yearly. Eligible new subscribers get a free trial: 1 week with the monthly plan, 2 weeks with the yearly plan. Payment is charged to your Apple Account at confirmation of purchase, or when the free trial ends. The subscription renews automatically unless canceled at least 24 hours before the end of the current period, and the renewal is charged within the 24 hours before the period ends. Manage or cancel it in your Apple Account settings. Any unused part of a free trial is forfeited when you purchase a subscription. Terms of Use: https://harmonytimer.journeyon.co/TermsOfService.html Apple's Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://harmonytimer.journeyon.co/PrivacyPolicy.html

Train your breath like a professional freediver. O2 is a science-based breath-hold training app that helps you extend your breath-hold time, build CO₂ tolerance, and improve mental focus through progressive training protocols. PROVEN TRAINING METHODS • CO₂ Tables — Build carbon dioxide tolerance with decreasing rest intervals • O₂ Tables — Extend breath-hold capacity with increasing hold times • Box Breathing — The 4-4-4-4 technique for stress relief and focus • Progressive difficulty levels from beginner to advanced BUILT FOR PERFORMANCE • Designed for freedivers, spearfishers, swimmers, surfers, and athletes • Used by professionals to prepare for competition and improve underwater performance • Backed by established breath-hold training science SMART TRAINING EXPERIENCE • Haptic feedback guides you through each phase without looking at the screen • Voice cues announce hold and breathe phases • Visual timer with clear phase indicators • Track your progress with detailed statistics HEALTH INTEGRATION • Sync workouts to Apple Health • Track your training consistency • Monitor progress over time SIMPLE & FOCUSED • Clean, distraction-free interface • No subscriptions — one-time purchase unlocks everything forever • Works offline, anywhere • Family Sharing supported Whether you're training for freediving competitions, improving your surf hold-downs, or simply want to experience the mental clarity that comes with breath control — O2 gives you the tools to progress safely and effectively. Start your breath-hold journey today.