# Simple Nitrox vs Turn Pressure

The clearest difference is in-app purchases: Turn Pressure at none against Simple Nitrox's 1. Turn Pressure also leads on update cadence (every 4 days vs every 29 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Simple Nitrox sells 1 one-off in-app purchase. Turn Pressure asks for nothing beyond the download.

Simple Nitrox ships an update every 29 months, Turn Pressure every 4 days. The most recent releases landed on September 12, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Simple Nitrox | Turn Pressure |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/turn-pressure-dive-planner/id6801749776/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 4 days** |
| Monetization | — | Free |
| Size | 2 MB | 6 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Simon Chivers](https://appshunter.io/developer/1698955737) | [RUSTAM ISMAILOV](https://appshunter.io/developer/6799582362) |

## What reviewers say

### Simple Nitrox

[App page](https://appshunter.io/ios/app/simple-nitrox/id6463395880)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simple Nitrox Full Access | $0.99 | one-time |


### Turn Pressure

[App page](https://appshunter.io/ios/app/turn-pressure-dive-planner/id6801749776)

This app calculates dive turn pressure, minimum gas reserves, and bottom times for recreational divers. It provides dynamic planning based on specific dive parameters, cylinder size, and gas mixes, offering detailed ascent profiles and tracking personal gas consumption rates.

**Highlights:** Dynamic turn pressure calculation, Minimum gas reserve for two divers, Bottom time limit based on gas or NDL, Repeat dive planning with surface interval, Detailed ascent profiles, Personal SAC rate tracking, Metric and imperial unit support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Simple Nitrox free?

Simple Nitrox is free to download, with in-app purchases available.

### Is Turn Pressure free?

Turn Pressure is free to download, with no in-app purchases.

### Do Simple Nitrox or Turn Pressure have ads?

Neither Simple Nitrox nor Turn Pressure shows ads.

### Which is updated more often, Simple Nitrox or Turn Pressure?

Simple Nitrox ships an update every 29 months, and Turn Pressure every 4 days. Most recently, Simple Nitrox was updated on September 12, 2026 and Turn Pressure on October 29, 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.*