# TrimixCalc > Mixed gas diving calculator for technical divers, including EAD and MOD. (iPhone/iPad app by frobese GmbH.) - Source: https://appshunter.io/ios/app/trimixcalc/id713460902 (this page in markdown: same URL + `.md`) - Developer: [frobese GmbH](https://appshunter.io/developer/291683874) - Category: Sports, Utilities - Price: Free with in-app purchases - Rating: 3.96/5 from 26 App Store ratings · 8 written reviews indexed - Age rating: 4+ - Requires: iOS 9.3 · 7 MB - Languages: English, German, Italian, Russian, Spanish - Released: 2013-11-24 - Data updated: 2026-06-10 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/trimixcalc/id713460902/reviews.md ## What is TrimixCalc? TrimixCalc is the continuing development of NitroxCalc for tec divers. More and more ambitious divers are interested in mixed gas diving with helium added to the breathing gas. In addition to oxygen now helium is considered in the calculations of EAD and MOD. With this App, it is now possible to accurately and quickly calculate maximum depth, depth comparison and Best Mix for your dive. This of course does not replace a careful dive planning. But you get a first result of the gas mixtures you need for your dive. An important tool is the additional gas blender function, which tells you how much of each gas to add in order to achieve a target mixture given a specific starting point of tank pressure and gas concentration (especially useful when you have precious left over gas in your tank from a previous dive). We do recommend however to leave the mixing to certified professionals. This version is limited to 21%-28% O2 and 0-25%He. Blending only starts with empty bottles. If you are a ambitious tek-diver, you may switch to a unlimited version via In-App purchase. Have fun with the app! Issues and error messages will be answered via our contact address. References in the reviews are not useful to us, since we have no access to it. ## Key features - Trimix and Nitrox calculations - EAD and MOD computation - Best Mix determination - Depth comparison - Gas blender function - Limited O2/He range in free version ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Tec Dive | $3.99 | one-time | ## Recent user reviews (8 of 8) All indexed reviews: https://appshunter.io/ios/app/trimixcalc/id713460902/reviews.md ### 1/5 — Needs to be corrected *2024-08-29* When the best mix section is set to Imperial units it is actually calculating in Metric. Ex: when a depth of 150’ is entered it shows a best mix of O2 of 9% ### 1/5 — Buggy *2023-07-17* Can’t fully evaluate since you can’t enter values in all fields. Have to reset setting’s preferences each time you open the app. ### 2/5 — Disappointed *2023-03-21* Evening after paying the premium I cannot calculate a mix using any top off gas other than air. Basic requirement that is lacking in this app unfortunately ### 1/5 — Absolute waste of time and money! *2023-03-12* Scam app, charges you £3.99 to calculate the best mix beyond 60m. So I paid, and won’t calculate the best mix, past 120m. So for deep technical divers like me it’s a complete waste of money! And a scam, as it doesn’t explain before you buy it, it’s limited to 120m, otherwise I wouldn’t have bought it! Beware! Scam! ### 1/5 — DONT BUY *2022-11-29, version 1.2* Does not work. Significant math errors. ### 1/5 — Poor *2019-04-26, version 1.2* Doesn’t work Purchased unlock and buttons don’t activate anything **Developer response:** Hello, to help solving your problem can you please send an email to NitroxCalc@frobese.de ### 1/5 — O2 error *2015-12-14, version 1.1.1* O2 calculations are off by a factor of 2. 20% of O2 in a 3000 psi tank should be 600 psi. I think there is a mistake in the programming. **Developer response:** Please send us the parameters to check the calculation. Have you considered, that topping with air increases the O2 ration in the tank? ### 4/5 — Solid app for mixing *2014-01-12, version 1.0* Easy to use Interface which allows you to use your finger or type in values. I feel the touch is a little off and find myself hitting other tabs. The upgrade is $3.99 and would make an excellent choice if one were more serious about using this app. ## Frequently asked questions about TrimixCalc ### What is TrimixCalc used for? TrimixCalc is a tool for technical divers to calculate dive parameters when using mixed gases containing helium, such as Trimix. It helps determine maximum operating depth (MOD), equivalent air depth (EAD), and the best gas mix for a dive. ### Does TrimixCalc have ads? No, TrimixCalc does not contain advertisements. The app is free to download and use, with an option for an unlimited version available via in-app purchase. ### What is the age rating for TrimixCalc? TrimixCalc has an age rating of 4+. This indicates it is suitable for users of all ages, though its technical nature may be more relevant to adults involved in technical diving. ### What devices does TrimixCalc support? TrimixCalc is available for iOS devices, including iPhones, iPads, and iPods. It is designed to run on these Apple mobile platforms. ### How often is TrimixCalc updated? The latest version of TrimixCalc is 1.2, which was last updated on June 26, 2017. Users can check for future updates to benefit from any new features or improvements. ### Can I use TrimixCalc for free? Yes, TrimixCalc offers a free version that allows you to perform calculations for specific oxygen and helium percentages. An in-app purchase is available to unlock unlimited features. ### What are the limitations of the free version of TrimixCalc? The free version of TrimixCalc is limited to calculations with 21%-28% O2 and 0-25% He. Gas blending in the free version also starts only with empty bottles. ### How does TrimixCalc compare to NitroxCalc? TrimixCalc is a continuation and expansion of NitroxCalc, specifically designed for technical divers. It adds the capability to calculate parameters for mixed gases containing helium, in addition to standard nitrox calculations. ## Version history (last 4 releases) ### 1.2 — 2017-06-26 This app has been updated by Apple to display the Apple Watch app icon. The first version in Spanish and Italian ### 1.1.1 — 2014-07-21 Hotfix for 64-bit version ### 1.1 — 2014-07-11 Gas blending gui enhancements and premix selection available. ### 1.0 — 2013-11-24 No release notes. ## Apps similar to TrimixCalc | App | Rating | Price | Category | | --- | --- | --- | --- | | [myPSS](https://appshunter.io/ios/app/mypss/id904666792) | 5.0 (1) | Free | Sports | | [TauchApp](https://appshunter.io/ios/app/tauchapp/id1571124791) | — | Free | Sports | | [OSTConf](https://appshunter.io/ios/app/ostconf/id1404182943) | — | Free | Sports | | [AWU2UDDF](https://appshunter.io/ios/app/awu2uddf/id1661616210) | 5.0 (2) | Free | Sports | | [Oxygen Cylinder Autonomy Calc](https://appshunter.io/ios/app/oxygen-cylinder-autonomy-calc/id1257704597) | — | Free | Sports | | [DiverLog Lite](https://appshunter.io/ios/app/diverlog-lite/id1091923188) | 2.7 (3) | Free | Sports | ## More apps by frobese GmbH - [NitroxCalc](https://appshunter.io/ios/app/nitroxcalc/id291683871) - [DiveSimulator](https://appshunter.io/ios/app/divesimulator/id750714088) - [Pignus](https://appshunter.io/ios/app/pignus/id1201822648) - [t2m timer](https://appshunter.io/ios/app/t2m-timer/id1480738769) All apps by frobese GmbH: https://appshunter.io/developer/291683874 --- *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 2026-06-10.*