# Trimix Tools vs The Sidewinder Checklist

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.

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.

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.

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.

## The numbers

| Metric | Trimix Tools | The Sidewinder Checklist |
| --- | --- | --- |
| Price | $6.99 | **$4.99** |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/trimix-tools/id289220808/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/the-sidewinder-checklist/id6476092633/reviews) |
| Number of ratings | **5** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 6 weeks** |
| Monetization | Paid | Paid |
| Size | 6 MB | 5 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Greg Mclaughlin](https://appshunter.io/developer/284919983) | [Andrew Austin](https://appshunter.io/developer/1708589155) |

## What reviewers say

### Trimix Tools

[App page](https://appshunter.io/ios/app/trimix-tools/id289220808)

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:** Vision Pro support

**In-app purchases:** none


### The Sidewinder Checklist

[App page](https://appshunter.io/ios/app/the-sidewinder-checklist/id6476092633)

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:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tiny Tip | $0.99 | one-time |
| Small Tip | $1.99 | one-time |
| Medium Tip | $4.99 | one-time |
| Large Tip | $9.99 | one-time |


## Frequently asked 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.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*