# Gas Manager: Nitrox & Trimix — Scuba Blender & MOD Calculator > Scuba diving gas blending and calculation tool for iPhone. (iPhone/iPad app by Ryan Booker.) - Source: https://appshunter.io/ios/app/gas-manager-nitrox-and-trimix/id500438406 (this page in markdown: same URL + `.md`) - Developer: [Ryan Booker](https://appshunter.io/developer/1200695611) - Category: Utilities, Sports - Price: $2.99 with in-app purchases - Rating: 4.00/5 from 2 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 26.0 · 16 MB - Languages: Canadian French, German (Germany), American English, Latin American Spanish, Italian - Released: 2012-02-11 - Data updated: 2026-09-17 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/gas-manager-nitrox-and-trimix/id500438406/reviews.md ## What is Gas Manager? Gas Manager is a fast, focused toolkit for divers who mix and plan their own breathing gases. Nitrox, trimix, and everything in between. BLENDING • Partial Pressure Blending: a step-by-step recipe from your current fill to your target mix, with optional oxygen and helium fudge factors to offset fill heating • Continuous Blending: the practical recipe for blending with a stick, including the drain-down and the top-off gas • Top Off: see exactly what mix you end up with when you top a partial fill with air, nitrox, trimix, or oxygen PLANNING • Operating Limits: MOD, END, EAD, and EADD for a gas, all on one screen • Operating Depth Range (MOD): the full usable depth window for a mix, not just the maximum, across your chosen PPO₂ range • Equivalent Narcotic Depth (END): with an option to treat oxygen as narcotic • Equivalent Air Depth (EAD): for using nitrox with air tables • Equivalent Air Density Depth (EADD): gas density in g/L plus the depth at which air would breathe the same, against the 5.2 and 6.2 g/L research limits • Best Mix: the richest, leanest-helium mix your PPO₂ and END limits allow BUILT FOR HOW YOU ACTUALLY FILL • Standard gases one tap away: air, EAN32, EAN50, oxygen, 30/30, 21/35, 18/45, 15/55, 12/65, 10/70, 8/85, 35/25; or dial in any custom mix • Metric and imperial throughout • Switch units and other settings whenever you like and everything is converted in place DESIGNED FOR APPLE PLATFORMS • Native on iPhone, iPad, and Apple Vision Pro • Siri and Shortcuts support, plus Home Screen Quick Actions for the primary tools • Full Dynamic Type, VoiceOver, Dark Mode, and tinted icon support • English, Spanish, French, German, and Italian • No account, no ads, no subscription. Buy it once. Tips are optional and always will be. WARNING Safe gas blending requires proper training and equipment. Gas Manager is a calculation aid, not a substitute for training. Always personally analyse and label your fills before diving. ## Key features - Nitrox and trimix partial pressure blending - Top off calculator - Best mix calculator - MOD calculation - END, EAD, and EDD calculation ## Pricing and in-app purchases Base price: $2.99. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Leave an Espresso Sized Tip | $2.99 | one-time | | Tip a Bag of Beans | $8.99 | one-time | | Tip a Big Bag of Beans | $29.99 | one-time | ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/gas-manager-nitrox-and-trimix/id500438406/reviews.md ### 5/5 — Easy and useful! *2018-01-03* Very easy to use app - works well along side tables and proper training - will be my daily go to - thanks for a great app ### 5/5 — Top *2013-08-25* Selbsterklärend, alles was man braucht, einfache Bedienung, Ergebnisse stimmen. Für Nitrox, Heliox &Trimix geeignet! Top App!! ### 3/5 — Good pocket tool for the gas blender *2013-02-13* The Gas Manager is a good pocket tool. I only miss the van der Waal equation. But with a little bit experience, the fudge-factor works good as well. The EAD function does not support Trimix! ### 1/5 — Not very good. *2012-12-14* This app isn't very good. Feel like I wasted $2.99. Needs an overhaul. Confusing to use, only gives best mix for trimix, NOT nitrox. Wish I could have my money back. ### 5/5 — Brilliant *2012-05-28* Great app. Just what I've been looking for ### 5/5 — Great *2012-02-13* Just what I have been looking for. Goo to double check keep up the great work . A++++ ## Frequently asked questions about Gas Manager ### What is Gas Manager? Gas Manager is a scuba diving tool for iPhone that helps you plan and blend diving gases. It includes calculators for various gas mixtures and dive parameters. ### What types of gas blending can Gas Manager help with? Gas Manager supports planning and blending of nitrox and trimix gases using partial pressure calculations. ### Does Gas Manager offer dive safety calculations? Yes, Gas Manager includes calculators for MOD (Maximum Operating Depth), END (Equivalent Narcotic Depth), EAD (Equivalent Air Depth), and EDD (Equivalent Depth of Decompression). ### What devices is Gas Manager compatible with? Gas Manager is designed for iPhone and is compatible with all supported iPhone models. ### How much does Gas Manager cost? Gas Manager is a paid application priced at $2.99. ### Is Gas Manager suitable for beginners? The app's description includes a warning that safe gas blending requires proper training and equipment. Users should always analyze and label their fills before diving. ### How often is Gas Manager updated? The latest version, 3.1.0, was last updated on September 12, 2025, indicating active development and support. ### Does Gas Manager have ads? No, Gas Manager does not contain advertisements. ## Version history (last 5 releases) ### 2026.3 — 2026-09-12 Gas Manager is now a native app on Apple Vision Pro and iPad. • A fully native iPad and Apple Vision Pro app with a two-column layout that keeps the tool list beside your calculations, and ⌘1–⌘9 to jump between tools • Landscape support for iPhone • Equivalent Air Density Depth (EADD) added alongside density calculations Requires iOS and iPadOS 26. ### 3.3.0 — 2026-05-17 - Add Home Screen Quick Actions for primary and most recently used tools - Add Operating Limits App Shortcut/Intent ### 3.2.0 — 2026-05-09 Compatibility updates, bug fixes, and improvements. ### 3.1.0 — 2025-09-12 - Updated for Liquid Glass ### 3.0.1 — 2025-02-13 - Minor localisation fixes. ## Related topics [gas manager](https://appshunter.io/ios/topics/gas-manager) · [scuba gas manager](https://appshunter.io/ios/topics/scuba-gas-manager) · [trimix mod](https://appshunter.io/ios/topics/trimix-mod) · [trimixblending](https://appshunter.io/ios/topics/trimixblending) --- *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 2026-09-17.*