# Nitrox Helper — Nitrox Diving Calculator > Nitrox Diving Calculator (iPhone/iPad app by Robert O'Connell.) - Source: https://appshunter.io/ios/app/nitrox-helper/id1451300850 (this page in markdown: same URL + `.md`) - Developer: [Robert O'Connell](https://appshunter.io/developer/1451300849) - Category: Sports, Utilities - Price: Free with in-app purchases (on sale, was $2.99) - Age rating: 4+ - Requires: iOS 26.0 · 7 MB - Languages: American English - Released: 2019-02-11 - Data updated: 2026-08-20 - User reviews in markdown: https://appshunter.io/ios/app/nitrox-helper/id1451300850/reviews.md ## What is Nitrox Helper? Nitrox Helper is a Nitrox calculator designed for qualified EAN divers. Whether you're at the dive shop deciding on your mix or reviewing calculations before a dive, Nitrox Helper gives you quick, accurate answers with an interface designed for ease of use - even with cold hands. Your essential dive buddy for Enriched Air Nitrox (EAN) calculations. FOUR POWERFUL CALCULATORS Best EAN Mix Calculate the optimal oxygen percentage for your planned depth and PPO limit. Know exactly what mix to ask for at the fill station. Maximum Operating Depth (MOD) Determine the deepest safe depth for any Nitrox mix. Essential for dive planning and safety. Equivalent Air Depth (EAD) Convert your Nitrox dive to an equivalent air depth for use with standard Recreational Dive Planner (RDP) tables. Oxygen Partial Pressure (PPO) Monitor your oxygen partial pressure at any depth. Clear safety indicators warn you when approaching or exceeding safe limits. SALT WATER & FRESH WATER Calculate accurately for both environments. Sea water (10.0 m/atm) and fresh water (10.3 m/atm) use different pressure factors - Nitrox Helper accounts for this automatically. A read-only indicator on every calculator tab shows your current water type so you always know what you're calculating for. 8 LANGUAGES Use the app in your preferred language: English (UK), English (US), Afrikaans, Greek, French, Spanish, German, and Dutch. PERSONALISE YOUR EXPERIENCE - 16 beautiful colour themes - Metric (metres) or Imperial (feet) units - Configurable decimal places (0-3) for depth and PPO results - Per-tab unit switching from the toolbar DESIGNED FOR SAFETY - Clear PPO safety status indicators (Safe / Caution / Danger) - Visual warnings when exceeding Maximum Operating Depth - Read-only water type indicator prevents accidental changes - Important safety disclaimer on every calculator PRIVACY FIRST Your data stays on your device. No tracking, no analytics, no account required, no internet connection needed. TRY BEFORE YOU SUBSCRIBE The app has two separate trial mechanisms: 1. Nitrox Helper is free to download with a 30-day in-app trial that gives full access for 30 days. 2. 2-week introductory offer — Available on the Monthly, 6 Monthly, and Annual subscription plans. Compatible with iPhone and iPad. The Pro Tier has three subscription options. Nitrox Helper Pro Monthly at $0.99 a month with a 2-week free trial. Nitrox Helper Pro 6 Months at $5.99 every 6 months with a 2-week free trial. Nitrox Helper Pro Annual at $9.99 a year with a 2-week free trial — our best value. Nitrox Helper Pro Lifetime at $49.99 one-time. You control your subscriptions through the App Store subscription settings. DISCLAIMER: This calculator is for discussion purposes only and is not intended for actual dive planning. Always refer to your certifying agency's Enriched Air Diving procedures to plan your dives. Privacy Policy URL https://solosoftware.app/nitrox-helper/Nitrox_H_Privacy_Policy.html Your use of Nitrox Helper is governed by Apple's standard Licensed Application End User License Agreement. Terms of Service (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Pro Monthly | $0.99 | per month | | Pro Annual | $9.99 | per year | | Pro 6 Monthly | $5.99 | per 6 months | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Pro Lifetime | $49.99 | one-time | ## Version history (last 5 releases) ### 26.1.0 — 2026-03-23 Completely rebuilt from the ground up with a modern, beautiful design. NEW IN THIS VERSION: - Fresh water diving support - 8 languages: English (UK/US), Afrikaans, Greek, French, Spanish, German, Dutch - 16 colour themes to personalise your experience - Configurable decimal places for precision - Water type indicator on all calculator tabs - Guided onboarding to get you started quickly ### 1.4 — 2020-10-25 Updated for IOS 14 ### 1.3 — 2020-01-27 Added support for both light and dark appearances in iOS 13. ### 1.2 — 2019-04-02 If you're enjoying using Nitrox Helper, please leave me a review. You guys are the reason why I love creating new apps. You guys are also the reason why I spend sleepless nights thinking about how I can improve my apps. When the late nights coding gets tough, I know I can always read the 5-star reviews from you guys to motivate me, every review makes a difference to my day! If you reviewed or rated a previous version, please resubmit it as ratings are reset with every new update. When PPO results greater than 1.6 are displayed with a warning the highlighted PPO result has been resized. Updated to Swift 5. ### 1.1 — 2019-02-21 If you're enjoying using Nitrox Helper, please leave me a review. You guys are the reason why I love creating new apps. You guys are also the reason why I spend sleepless nights thinking about how I can improve my apps. When the late nights coding gets tough, I know I can always read the 5-star reviews from you guys to motivate me. Every review makes a difference to my day! If you reviewed or rated a previous version, please resubmit it as ratings are reset with every new update. The Best Mix view has been updated for the user to select the number of decimals to display. ## Apps similar to Nitrox Helper | App | Rating | Price | Category | | --- | --- | --- | --- | | [Baltic Deco Planner](https://appshunter.io/ios/app/baltic-deco-planner/id304464483) | 4.7 (49) | $18.99 | Sports | | [TRASOL](https://appshunter.io/ios/app/trasol/id1015112834) | 4.0 (40) | Free | Sports | | [Harding University's HU16](https://appshunter.io/ios/app/harding-universitys-hu16/id1545995331) | 5.0 (4) | Free | Sports | | [nitroxCalc](https://appshunter.io/ios/app/nitroxcalc/id1408060704) | — | Free | Sports | | [Trimix Tools](https://appshunter.io/ios/app/trimix-tools/id289220808) | 5.0 (5) | $6.99 | Sports | | [UT Tyler Athletics](https://appshunter.io/ios/app/ut-tyler-athletics/id1603693897) | — | Free | Sports | ## More apps by Robert O'Connell - [Calendar Counter](https://appshunter.io/ios/app/calendar-counter/id1479180184) - [Claude Counter](https://appshunter.io/ios/app/claude-counter/id6754242730) All apps by Robert O'Connell: https://appshunter.io/developer/1451300849 ## Related topics [nitrox buddy](https://appshunter.io/ios/topics/nitrox-buddy) --- *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 2026-08-20.*