# Kokyu: Diver Companion — Breathe. Dive. Discover. > Apnea and breath-hold training app for freediving and fitness. (iPhone/iPad app by Kubicle LLC.) - Source: https://appshunter.io/ios/app/kokyu-diver-companion/id6749611776 (this page in markdown: same URL + `.md`) - Developer: [Kubicle LLC](https://appshunter.io/developer/1679797468) - Category: Health & Fitness, Sports - Price: Free with in-app purchases - Rating: 5.00/5 from 5 App Store ratings - Age rating: 4+ - Requires: iOS 15.1 · 164 MB - Languages: American English, Filipino, Malay, Chinese (Traditional, Taiwan) - Released: 2025-08-07 - Data updated: 2026-08-11 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/kokyu-diver-companion/id6749611776/reviews.md ## What is Kokyu? Kokyu is an apnea and breath-hold training app for freediving, spearfishing, surf survival, and CO₂/O₂ table practice. Build lung capacity, improve breath-hold control, and progress with guided CO₂ and O₂ sessions tailored to your level. Train with guided CO₂ and O₂ tables, track your progress, and develop the calm and control needed for longer, more efficient breath-holds. Key Features: • Guided CO₂ and O₂ table sessions • Customizable breath-hold routines • Audio and haptic cues for hands-free training • Progress tracking and streaks • Designed for freedivers, surfers, athletes, and beginners Support: • Privacy Policy: https://docs.kubicle.studio/kokyu-privacy • Terms and Conditions: https://docs.kubicle.studio/kokyu-terms • EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula Acknowledgment: • Circle Water Splash by Vecteezy.com ## Key features - Guided CO₂ and O₂ table sessions - Customizable breath-hold routines - Audio and haptic cues - Progress tracking - Designed for various skill levels ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Kokyu Plus Annual | $11.99 | per year | | Kokyu Plus Monthly | $1.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Kokyu Lifetime | $59.99 | one-time | ## Frequently asked questions about Kokyu ### What is Kokyu used for? Kokyu is an apnea and breath-hold training app designed to help users build lung capacity and improve breath-hold control. It offers guided CO₂ and O₂ sessions tailored for freediving, spearfishing, surf survival, and general fitness. ### Does Kokyu have ads? No, Kokyu does not contain advertisements. The app is free to download and use, with optional in-app purchases for enhanced features. ### What are the subscription options for Kokyu? Kokyu offers a 'Kokyu Plus' subscription with monthly ($1.99/P1M) and annual ($11.99/P1Y) plans. The annual plan includes a 3-day free trial. ### How does Kokyu track progress? Kokyu features progress tracking to monitor your breath-hold improvements over time. It also includes a streak feature to encourage consistent training. ### Can Kokyu be used hands-free? Yes, Kokyu is designed for hands-free training with audio and haptic cues. This allows users to focus on their breath-hold exercises without needing to constantly check their device. ### What devices support Kokyu? Kokyu is available for iPhone and iPod devices. The app is rated for ages 4 and up. ### How often is Kokyu updated? The latest version of Kokyu is 1.4.1, which was last updated on February 3, 2026. Updates typically include new features, bug fixes, and performance improvements. ### What is the user sentiment for Kokyu? Kokyu has received overwhelmingly positive feedback, with an average rating of 5.0 stars from 5 ratings. This indicates a high level of user satisfaction with the app's functionality and effectiveness. ## Version history (last 5 releases) ### 1.4.1 — 2026-02-03 We’ve held our breath for this update - built to help you train smarter and push your limits. ### 1.4.0 — 2026-01-22 We’ve held our breath for this update - built to help you train smarter and push your limits. ### 1.3.2 — 2026-01-18 We’ve held our breath for this update - built to help you train smarter and push your limits. ### 1.3.1 — 2026-01-15 We’ve held our breath for this update - built to help you train smarter and push your limits. ### 1.3.0 — 2026-01-12 We’ve held our breath for this update - built to help you train smarter and push your limits. ## Apps similar to Kokyu | App | Rating | Price | Category | | --- | --- | --- | --- | | [Stamina Apnea Trainer: ApneaX](https://appshunter.io/ios/app/stamina-apnea-trainer-apneax/id6744343835) | — | Free | Health & Fitness | | [Apnea Training for Freediving](https://appshunter.io/ios/app/apnea-training-for-freediving/id6474778415) | 5.0 (2) | Free | Health & Fitness | | [Apnea & Freediving Breath Hold](https://appshunter.io/ios/app/apnea-and-freediving-breath-hold/id6756186845) | — | Free | Health & Fitness | | [Assasa](https://appshunter.io/ios/app/assasa/id6756825911) | — | Free | Health & Fitness | | [Apnea Trainer: Nea](https://appshunter.io/ios/app/apnea-trainer-nea/id6461216531) | 5.0 (6) | Free | Health & Fitness | | [Breathe: Guided Exercise Coach](https://appshunter.io/ios/app/breathe-guided-exercise-coach/id6754893676) | 5.0 (1) | Free | Health & Fitness | ## More apps by Kubicle LLC - [MonsterDex: The Ultimate Guide](https://appshunter.io/ios/app/monsterdex-the-ultimate-guide/id6447112284) - [NutriCado: Food Scanner](https://appshunter.io/ios/app/nutricado-food-scanner/id6465133294) - [LeetCard: Coding Flashcards](https://appshunter.io/ios/app/leetcard-coding-flashcards/id6478087443) - [Woj: Create Your Wojak](https://appshunter.io/ios/app/woj-create-your-wojak/id6739454782) - [Slacker: The Anti-Hustle Club](https://appshunter.io/ios/app/slacker-the-anti-hustle-club/id6745766756) All apps by Kubicle LLC: https://appshunter.io/developer/1679797468 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-11.*