# Dr. CheckOff vs IGC H₂

The clearest difference is update cadence: IGC H₂ at every 5 days against Dr. CheckOff's every 2 weeks. IGC H₂ also leads on iOS requirement (13.4 vs 16.6). 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.

Dr. CheckOff ships an update every 2 weeks, IGC H₂ every 5 days. The most recent releases landed on October 8, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Dr. CheckOff | IGC H₂ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Size | 97 MB | 17 MB |
| Requires iOS | 16.6 | **13.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Trevor Rogers](https://appshunter.io/developer/1702643907) | [Industrial Gas Consultants LLC](https://appshunter.io/developer/1725282233) |

## What reviewers say

### Dr. CheckOff

[App page](https://appshunter.io/ios/app/dr-checkoff/id6461722452)

**Features:** macOS Compatibility

**In-app purchases:** none


### IGC H₂

[App page](https://appshunter.io/ios/app/igc-h-co-unit-conversion-app/id6475814418)

**In-app purchases:** none


## Frequently asked questions

### Is Dr. CheckOff free?

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

### Is IGC H₂ free?

IGC H₂ is free to download, with no in-app purchases.

### Do Dr. CheckOff or IGC H₂ have ads?

Neither Dr. CheckOff nor IGC H₂ shows ads.

### Which is updated more often, Dr. CheckOff or IGC H₂?

Dr. CheckOff ships an update every 2 weeks, and IGC H₂ every 5 days. Most recently, Dr. CheckOff was updated on October 8, 2026 and IGC H₂ on October 15, 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.*