Comparison

Trimix Tools vs AON2 X2

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Trimix Tools

This app provides essential tools for divers to plan and blend Trimix gases. It calculates optimal mixes based on depth, oxygen partial pressure, and equivalent narcotic depth, and supports various cylinder filling scenarios. Calculations are available offline and can be customized with saved settings.

Highlights
  • 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
Features
Currently charting
Read full description

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.

About

AON2 X2

This app connects to a specific device to log jumps, set drop zones, and adjust device settings. It offers GPS waypoint functionality for global use.

Highlights
  • Bluetooth device connection
  • View jump logs
  • Set drop zones
  • Set GPS waypoints
  • Change device settings
Features
Read full description

The X2 companion app connects to your X2 device via bluetooth. Allowing you to view your jump logs, set a drop zone or GPS waypoint at any where in the world and easily change X2 settings.

Screenshots

Trimix Tools4 screens
AON2 X23 screens

Verdict

The call

The clearest difference is review sentiment: Trimix Tools at 100% against AON2 X2's 0%. Trimix Tools also leads on rating (5.0 vs 2.5) and chart position (#56 vs unranked). AON2 X2's advantage is price (Free vs $6.99). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

AON2 X2 is free to download; Trimix Tools costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Trimix Tools holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 5 and 8 respectively. Written reviews point the same way: 100% of Trimix Tools's written reviews are positive against 0% of AON2 X2's.

UpkeepUpdate frequency

Trimix Tools ships an update every 5 months, AON2 X2 every 6 months. The most recent releases landed on September 10, 2026 and June 1, 2026 respectively.

Scorecard5 real differences · 6 level
Trimix Tools versus AON2 X2: the parameters behind the verdict, then further details
ParameterTrimix ToolsAON2 X2
Price$6.99Free — better
Rating5.0 (5 ratings) — better2.5 (8 ratings)
Positive reviews100.0% of reviews — better0.0% of reviews
Number of ratings58 — better
Update frequencyEvery 5 months — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#56 — better—
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS15.614.0 — better
Further details — not scored
Size6 MB33 MB
Age rating4+4+
DeveloperGreg MclaughlinAON2 LTD

Customer experience

Trimix Tools

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews11 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

AON2 X2

All ratings8 ratings
Positive37.5%
Neutral0.0%
Negative62.5%
Written reviews4 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Trimix Tools

No in-app purchases

None

AON2 X2

No in-app purchases

Questions

Is Trimix Tools free?
Trimix Tools costs $6.99, with no in-app purchases.
Is AON2 X2 free?
AON2 X2 is free to download, with no in-app purchases.
Which has better reviews, Trimix Tools or AON2 X2?
Trimix Tools is rated higher. Trimix Tools averages 5.0 out of 5 from 5 ratings, while AON2 X2 averages 2.5 from 8 ratings.
Do Trimix Tools or AON2 X2 have ads?
Neither Trimix Tools nor AON2 X2 shows ads.
Which is updated more often, Trimix Tools or AON2 X2?
Trimix Tools ships an update every 5 months, and AON2 X2 every 6 months. Most recently, Trimix Tools was updated on September 10, 2026 and AON2 X2 on June 1, 2026.

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