# Trimix Tools — Dive Planning and Blending

> Dive planning and Trimix gas blending calculator for divers. (iPhone/iPad app by Greg Mclaughlin.)

- Source: https://appshunter.io/ios/app/trimix-tools/id289220808 (this page in markdown: same URL + `.md`)
- Developer: [Greg Mclaughlin](https://appshunter.io/developer/284919983)
- Category: Sports, Utilities
- Price: $6.99
- Rating: 5.00/5 from 5 App Store ratings · 11 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 6 MB
- Languages: American English
- Released: 2019-02-12
- Data updated: 2026-08-29
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/trimix-tools/id289220808/reviews.md

## What is Trimix Tools?

Trimix blending and planning tools that can be used where you are and when you need them.

You can use these tools to plan your mixes prior to arriving at the dive shop or to fill your cylinder at the air station or on the boat. Calculations are provided for the best Trimix given a planned depth and a desired maximum partial pressure of oxygen and equivalent narcotic depth (END). You can also calculate the ceiling and maximum depths along with your END based on your planned mix. The dive planning tools support both salt water and fresh water calculations. The blending tools provide for filling a cylinder with a remaining mix (or empty) to a specified target mix using oxygen, helium and a topping mix (air or another available mix). You can also calculate the result of topping an existing partially filled cylinder with a specific topping mix (air or another available mix). There is also a Bleed Down calculator that allows you adjust an existing full or partially full cylinder to a new mix with minimal wasted gas. Trimix Tools supports calculations in both metric and Imperial/US systems of measure.

Traveling on a boat or working out of network range? These tools are at hand any time you have your iPhone, iPad or iPod touch. You could, for example, easily calculate the result of topping your cylinder from your first dive with air from the boat's compressor to take advantage of any remaining mix. You also have the convenience of saved settings that you can recall at a touch and adjust to a new situation as needed.

Chances are you regularly work with a specific set of mixes and common dive situations. Trimix Tools includes the convenience of saved settings that you can recall and adjust to a new situation as needed. You can also select mix values using pre-installed default mixes or your own saved custom mixes. When updating one of the mixes for a tool you are offered a list of saved mixes that you can use directly or adjust as needed. You can save the currently displayed mix by tapping on the "+" button. Just like with the saved calculations, you can re-arrange or delete any mixes in your saved list.

Do you need to share your planning or blending calculations with other divers? All the tools have the ability to share the results of the calculations from within the application. You can set default email addresses and a subject Trimix Tool's settings that will be automatically added when you share a result.

All END calculations (Dive Planning and Best Trimix tabs) in Trimix Tools treat oxygen as a narcotic gas by default. There is an option available under the Settings tab to change the default so that oxygen is not treated as narcotic if that is your preference. Remember you must always personally analyze your mix before diving it.

This application is not a substitute for proper training and should not be used as a substitute for proper dive planning or the primary Trimix blending and planning methods taught during training. Please do not attempt to handle high pressure oxygen or fill SCUBA cylinders without proper training.

## Key features

- Trimix blending and planning
- Depth and partial pressure calculations
- Equivalent Narcotic Depth (END) calculation
- Saltwater and freshwater support
- Cylinder filling and bleed down calculations
- Metric and Imperial system support
- Offline functionality
- Saved settings and custom mixes

## Recent user reviews (10 of 11)

All indexed reviews: https://appshunter.io/ios/app/trimix-tools/id289220808/reviews.md

### 5/5 — Excellent Trimix Tool

*2019-11-22*

Results are accurate and correct for all mixes and top ups I have done and all of the corner test cases that I’ve tried. The interface is great and makes sense for Trimix divers and blenders. Well done! Thank you!!!

### 5/5 — Beste App

*2018-07-03*

Beste App in dieser Kategorie, passt immer.

### 5/5 — Excellent app

*2013-06-12*

As someone who blends various mixes all the time, this little app has been a god send, there when you need it!

### 5/5 — Nice program

*2011-07-16*

Can do all my custom blends of trimix and nitrox.  When making a lean trimix via a top-off from a banked nitrox and air, you will have to guess the the final helium content of the mix to where you are only "adding" ~5 psi of helium in order to get a calculated result. 

To have the program do this would be nice, but would add another level of complexity.

### 5/5 — Great app!

*2010-10-10*

What a wonderful app works well with the trimix and nitrox dives. This is a useful tool for anyone who is calculating mixes.

### 5/5 — Super App

*2010-07-07*

Super App!
Macht genau das was es soll.
Berechnet die Gasanteile und den Bestmix

### 5/5 — Good app.

*2010-06-30*

Very handy app for anyone who blends or uses mixed diving gasses.

### 5/5 — Excellent

*2010-06-03*

Excellent application for blending gas mixtures.  Easy to use.

### 4/5 — So far so good.

*2009-07-22*

Easy entry and the right features. Much better gas blender pro which is lame.

### 4/5 — Almost Perfect

*2009-03-20*

This tool is almost perfect for me (DSAT Gas Blender Instructor incl. Trimix). Very good user interface, does everything it is supposed to. Also usable for Nitrox, several standard EAN mixes are included, or simply enter as custom gas mix that contains no helium.
Only four points, because the bleed calculator of Nitrox Tools from the same developer is not yet included, and because it does not support Heliox mixes yet.

## Frequently asked questions about Trimix Tools

### What is Trimix Tools?

Trimix Tools is a mobile application designed to assist divers with planning and blending Trimix gases. It offers features for calculating optimal gas mixes, determining dive limits, and managing cylinder fills, all accessible offline.

### How does Trimix Tools calculate best Trimix?

Trimix Tools calculates the best Trimix based on your planned dive depth, desired maximum partial pressure of oxygen (PO2), and equivalent narcotic depth (END). It helps you find the optimal gas blend for safe and effective dives.

### Can Trimix Tools be used offline?

Yes, Trimix Tools is designed for use offline, making it ideal for divers who are traveling on boats or working in areas with limited network connectivity. You can perform all necessary calculations without an internet connection.

### Does Trimix Tools support both metric and imperial units?

Yes, Trimix Tools supports calculations in both metric and Imperial/US systems of measure. This allows divers from different regions to use the app comfortably with their preferred units.

### How does the blending calculator work in Trimix Tools?

The blending tools allow you to fill a cylinder to a specified target Trimix by using oxygen, helium, and a topping mix. It also supports calculating the result of topping an existing partially filled cylinder or using a bleed down calculator to adjust mixes with minimal gas waste.

### Can I save my custom Trimix mixes in Trimix Tools?

Yes, Trimix Tools allows you to save your custom mixes and recall them easily. You can also select mix values from pre-installed default mixes or your own saved custom mixes, and re-arrange or delete them as needed.

### Is Trimix Tools suitable for beginners?

Trimix Tools is intended for certified divers who are trained in Trimix diving and blending. It is not a substitute for proper training or established dive planning methods, but rather a tool to support those who already have the necessary knowledge.

### What is the price of Trimix Tools?

Trimix Tools is a paid application, available for $6.99. This one-time purchase grants you access to all its features for dive planning and gas blending.

## Version history (last 5 releases)

### 2.3 — 2026-06-24

• Improved compatibility with iOS 26.
• Adopted Liquid Glass.
• Minor improvements.

### 2.2 — 2025-09-28

• Minor improvements.

### 2.1.8 — 2024-04-24

• Minor improvements.

### 2.1.7 — 2024-03-05

• Minor improvements.

### 2.1.6 — 2023-10-02

• Improved compatibility with iOS 17.

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## More apps by Greg Mclaughlin

- [Nitrox Tools](https://appshunter.io/ios/app/nitrox-tools/id284919980)
- [Dive Log](https://appshunter.io/ios/app/dive-log/id301049600)

All apps by Greg Mclaughlin: https://appshunter.io/developer/284919983

## Related topics

[trimix tools](https://appshunter.io/ios/topics/trimix-tools) · [trimixblending](https://appshunter.io/ios/topics/trimixblending) · [trimix](https://appshunter.io/ios/topics/trimix)

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*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 2026-08-29.*