# Gas Blender Toolkit vs OVM

The clearest difference is price: Gas Blender Toolkit at $2.99 against OVM's $7.99. Gas Blender Toolkit also leads on update cadence (every 9 days vs monthly) and device support (3 vs 1). On ads, in-app purchases and iOS requirement there is nothing between them.

Gas Blender Toolkit costs $2.99 and OVM $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Gas Blender Toolkit ships an update every 9 days, OVM monthly. The most recent releases landed on November 6, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Gas Blender Toolkit | OVM |
| --- | --- | --- |
| Price | **$2.99** | $7.99 |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/gas-blender-toolkit/id1467768490/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Monthly |
| Monetization | Paid | — |
| Size | 3 MB | 2 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Oleg Gurevich](https://appshunter.io/developer/1467768489) | [data-project bv](https://appshunter.io/developer/1896180478) |

## What reviewers say

### Gas Blender Toolkit

[App page](https://appshunter.io/ios/app/gas-blender-toolkit/id1467768490)

This comprehensive toolkit assists scuba divers in calculating and blending various gas mixtures like trimix, nitrox, and heliox. It offers features for both partial pressure and continuous blending, cost calculation, and utilizes ideal and real gas models for accuracy. Optimized for larger screens, it serves as a successor to a previous diving application.

**Highlights:** Partial pressure blending, Continuous blending, Trimix, nitrox, heliox calculations, Ideal and real gas models, Cost calculation, Top off from storage

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

**In-app purchases:** none


### OVM

[App page](https://appshunter.io/ios/app/ovm/id6766059875)

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

**In-app purchases:** none


## Frequently asked questions

### Is Gas Blender Toolkit free?

Gas Blender Toolkit costs $2.99, with no in-app purchases.

### Is OVM free?

OVM costs $7.99, with no in-app purchases.

### Do Gas Blender Toolkit or OVM have ads?

Neither Gas Blender Toolkit nor OVM shows ads.

### Which is updated more often, Gas Blender Toolkit or OVM?

Gas Blender Toolkit ships an update every 9 days, and OVM monthly. Most recently, Gas Blender Toolkit was updated on November 6, 2026 and OVM on October 25, 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.*