Comparison

Trimix Tools vs The Sidewinder Checklist

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
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

The Sidewinder Checklist

This app digitizes rebreather diving preparation with user-friendly checklists and countdown timers. It helps manage gear, track build history, and reduce paper waste for a more efficient and eco-friendly diving experience.

Highlights
  • Dedicated rebreather assembly checklists
  • Countdown timers for pre-breathes
  • Comprehensive task management for dive prep
  • Digital gear list with local data saving
  • Build history with mV values
  • Timely preparation notifications
Features
Read full description

The Sidewinder Checklist: Dive Simplified Welcome to The Sidewinder Checklist app – your ultimate digital companion for rebreather diving! Say goodbye to paper waste and embrace the digital revolution with our user-friendly app, specifically designed for iPhone and iPad. This innovative application is crafted to streamline your diving experience, making rebreather assembly and dive planning more efficient, environmentally friendly, and enjoyable. Key Features: Dedicated Checklists: Our app follows the manual lists to provide dedicated checklists for rebreather assembly. Ensure you never miss a step with intuitive and comprehensive guidance. Countdown Timers: Set precise countdown timers for Positive, Negative, and Pre-breathes, ensuring your rebreather preparation is timely and accurate. Comprehensive Task Management: Manage your build prep with ease. Our checklist helps you track every detail of your dive preparation. Save the Planet: Move away from throwaway paper checklists for every dive. Our digital solution not only streamlines your preparation but also contributes to reducing paper waste, helping you dive sustainably. Gear List with Locally Saved Data: Keep a detailed gear list and save your data locally on your device. Access your equipment checklist anytime, ensuring you’re always prepared for your dive. Notifications: Stay on top of your dive planning with timely notifications. Our app reminds you of crucial preparation steps and countdowns, so you’re always ready to dive without delay. Build History with Locally Saved Data: Stay on top of your cell health with cell accuracy charts. Along with build history that includes all the mV values stored from your build. Your Dive, Our Priority: The Sidewinder Checklist app is more than just a checklist; it's a comprehensive tool designed to enhance your diving experience. Whether you’re a seasoned rebreather diver or just starting, our app ensures your preparation is thorough, efficient, and environmentally conscious. Download Now: Ready to transform your diving routine? Download The Sidewinder Checklist app today and take the first step towards a more organized, efficient, and eco-friendly diving experience!

Screenshots

Trimix Tools4 screens
The Sidewinder Checklist4 screens

Verdict

The call

The clearest difference is in-app purchases: Trimix Tools at none against The Sidewinder Checklist's 4. Trimix Tools also leads on ratings volume (5 vs 1) and device support (4 vs 2). The Sidewinder Checklist's advantage is update cadence (every 6 weeks vs every 5 months) and price ($4.99 vs $6.99). On rating, ads and monetization model 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

Trimix Tools costs $6.99 and The Sidewinder Checklist $4.99 up front. The Sidewinder Checklist sells 4 one-off in-app purchases. Trimix Tools asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Trimix Tools against 5.0 for The Sidewinder Checklist. That said, the two scores are not equally well evidenced: Trimix Tools has 5 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Trimix Tools ships an update every 5 months, The Sidewinder Checklist every 6 weeks. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.

Scorecard6 real differences · 4 level
Trimix Tools versus The Sidewinder Checklist: the parameters behind the verdict, then further details
ParameterTrimix ToolsThe Sidewinder Checklist
Price$6.99$4.99 — better
Rating5.0 (5 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings5 — better1
Update frequencyEvery 5 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS15.6 — better17.0
Further details — not scored
Size6 MB5 MB
Age rating4+4+
DeveloperGreg MclaughlinAndrew Austin

Customer experience

Trimix Tools

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

The Sidewinder Checklist

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Trimix Tools

No in-app purchases

4 purchases

The Sidewinder Checklist

One-time4
  • Tiny Tip$0.99
  • Small Tip$1.99
  • Medium Tip$4.99
Show 1 more
  • Large Tip$9.99

Questions

Is Trimix Tools free?
Trimix Tools costs $6.99, with no in-app purchases.
Is The Sidewinder Checklist free?
The Sidewinder Checklist costs $4.99, and also offers in-app purchases.
Which has better reviews, Trimix Tools or The Sidewinder Checklist?
Trimix Tools and The Sidewinder Checklist are both rated 5.0 out of 5 on the App Store, from 5 and 1 ratings respectively.
Do Trimix Tools or The Sidewinder Checklist have ads?
Neither Trimix Tools nor The Sidewinder Checklist shows ads.
Which is updated more often, Trimix Tools or The Sidewinder Checklist?
Trimix Tools ships an update every 5 months, and The Sidewinder Checklist every 6 weeks. Most recently, Trimix Tools was updated on October 14, 2026 and The Sidewinder Checklist on October 13, 2026.

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