# What Gas? vs MyDOE

The clearest difference is update cadence: MyDOE at every 5 months against What Gas?'s every 37 months. What Gas?'s advantage is iOS requirement (13.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

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

What Gas? ships an update every 37 months, MyDOE every 5 months. The most recent releases landed on November 2, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | What Gas? | MyDOE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/what-gas/id1230722190/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 37 months | **Every 5 months** |
| Monetization | Free | — |
| Size | 24 MB | 34 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [UNEP](https://appshunter.io/developer/1106793919) | [Department of Environment Malaysia](https://appshunter.io/developer/895645346) |

## What reviewers say

### What Gas?

[App page](https://appshunter.io/ios/app/what-gas/id1230722190)

This tool helps identify refrigerant gases, including ozone-depleting substances and their alternatives. It provides detailed information on chemical properties, hazards, and regulatory status for customs officers and technicians.

**Highlights:** Refrigerant gas identification, Information on ODS and alternatives, Details on ODP and GWP values, Searchable database, Flammability and hazard information, Montreal Protocol compliance data, Available in French and Spanish

**Features:** macOS Compatibility

**In-app purchases:** none


### MyDOE

[App page](https://appshunter.io/ios/app/mydoe/id6449247797)

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

**In-app purchases:** none


## Frequently asked questions

### Is What Gas? free?

What Gas? is free to download, with no in-app purchases.

### Is MyDOE free?

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

### Do What Gas? or MyDOE have ads?

Neither What Gas? nor MyDOE shows ads.

### Which is updated more often, What Gas? or MyDOE?

What Gas? ships an update every 37 months, and MyDOE every 5 months. Most recently, What Gas? was updated on November 2, 2026 and MyDOE on November 6, 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.*