# Gas Blender Toolkit vs IDDA

The clearest difference is review sentiment: Gas Blender Toolkit at 60% against IDDA's 0%. Gas Blender Toolkit also leads on chart position (#108 vs unranked). IDDA's advantage is price (Free vs $2.99). On update cadence, ads, in-app purchases and device support there is nothing between them.

IDDA is free to download; Gas Blender Toolkit costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Gas Blender Toolkit ships an update every 9 days, IDDA every 2 weeks. Both last shipped on September 17, 2026.

## The numbers

| Metric | Gas Blender Toolkit | IDDA |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| 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** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Monetization | Paid | **Free** |
| Best chart rank | **#108** | — |
| Size | 3 MB | 37 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Oleg Gurevich](https://appshunter.io/developer/1467768489) | [IDDA GmbH](https://appshunter.io/developer/1663006167) |

## What reviewers say

### Gas Blender Toolkit

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

**Currently charting:** #108 Top Paid · Sports (US App Store)

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


### IDDA

[App page](https://appshunter.io/ios/app/idda/id1663006165)

This platform offers e-learning content and certifications to enhance diving knowledge and prepare for exams. It's designed to make learning and exam preparation more accessible for divers. Future updates promise even more features to support your diving journey.

**Highlights:** E-learning content, Brevet platform, Diving knowledge enhancement, Exam preparation, Accessible learning

**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 IDDA free?

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

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

Neither Gas Blender Toolkit nor IDDA shows ads.

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

Gas Blender Toolkit ships an update every 9 days, and IDDA every 2 weeks. Most recently, Gas Blender Toolkit was updated on September 17, 2026 and IDDA on September 17, 2026.

---

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