# Nitrox Tools vs The Sidewinder Checklist

The clearest difference is in-app purchases: Nitrox Tools at none against The Sidewinder Checklist's 4. Nitrox Tools also leads on chart position (#144 vs unranked) and ratings volume (4 vs 1). The Sidewinder Checklist's advantage is update cadence (every 6 weeks vs every 5 months) and price ($4.99 vs $5.99). On rating, ads and monetization model there is nothing between them.

Nitrox Tools costs $5.99 and The Sidewinder Checklist $4.99 up front. The Sidewinder Checklist sells 4 one-off in-app purchases. Nitrox Tools asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Nitrox Tools against 5.0 for The Sidewinder Checklist. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

Nitrox Tools ships an update every 5 months, The Sidewinder Checklist every 6 weeks. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Nitrox Tools | The Sidewinder Checklist |
| --- | --- | --- |
| Price | $5.99 | **$4.99** |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/nitrox-tools/id284919980/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/the-sidewinder-checklist/id6476092633/reviews) |
| Number of ratings | **4** | 1 |
| Positive reviews | 88.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 6 weeks** |
| Monetization | Paid | Paid |
| Best chart rank | **#144** | — |
| Size | 7 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

### Nitrox Tools

[App page](https://appshunter.io/ios/app/nitrox-tools/id284919980)

**Currently charting:** #144 Top Paid · Sports (US App Store)

This app provides essential tools for divers to plan and blend enriched air nitrox. It calculates dive parameters like equivalent air depth and maximum operating depth, and supports various blending methods for custom gas mixes. Easily switch between metric and imperial units and save custom settings for frequent use.

**Highlights:** Enriched air nitrox blending, Dive planning calculations, Equivalent Air Depth (EAD), Partial Pressure of Oxygen (PPO2), Maximum Operating Depth (MOD), Save custom mixes and settings, Metric/Imperial unit switching

**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 Nitrox Tools free?

Nitrox Tools costs $5.99, 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, Nitrox Tools or The Sidewinder Checklist?

Nitrox Tools and The Sidewinder Checklist are both rated 5.0 out of 5 on the App Store, from 4 and 1 ratings respectively.

### Do Nitrox Tools or The Sidewinder Checklist have ads?

Neither Nitrox Tools nor The Sidewinder Checklist shows ads.

### Which is updated more often, Nitrox Tools or The Sidewinder Checklist?

Nitrox Tools ships an update every 5 months, and The Sidewinder Checklist every 6 weeks. Most recently, Nitrox Tools was updated on October 17, 2026 and The Sidewinder Checklist on October 13, 2026.

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