# OSTConf vs Turn Pressure

The clearest difference is update cadence: Turn Pressure at every 4 days against OSTConf's every 5 months. OSTConf's advantage is device support (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

OSTConf ships an update every 5 months, Turn Pressure every 4 days. The most recent releases landed on October 6, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | OSTConf | 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** |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 days** |
| Monetization | Free | Free |
| Size | 3 MB | 6 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kai-Uwe Sattler](https://appshunter.io/developer/500229044) | [RUSTAM ISMAILOV](https://appshunter.io/developer/6799582362) |

## What reviewers say

### OSTConf

[App page](https://appshunter.io/ios/app/ostconf/id1404182943)

Configure your dive computer settings and parameters wirelessly. Update date, time, custom text, gas mixes, and deco settings. Compatible with recent Bluetooth-enabled dive computers.

**Highlights:** Read and modify settings, Update date and time, Set custom text, Configure gas mixes, Set deco parameters, Upgrade firmware, Retrieve device information

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 OSTConf free?

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

### Is Turn Pressure free?

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

### Do OSTConf or Turn Pressure have ads?

Neither OSTConf nor Turn Pressure shows ads.

### Which is updated more often, OSTConf or Turn Pressure?

OSTConf ships an update every 5 months, and Turn Pressure every 4 days. Most recently, OSTConf was updated on October 6, 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.*