# IGC H₂ vs Formula Calculator #

The clearest difference is in-app purchases: IGC H₂ at none against Formula Calculator #'s 4. IGC H₂ also leads on ads (none vs shown) and update cadence (every 5 days vs every 5 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Formula Calculator # sells 4 one-off in-app purchases. IGC H₂ asks for nothing beyond the download.

IGC H₂ ships an update every 5 days, Formula Calculator # every 5 weeks. The most recent releases landed on September 11, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | IGC H₂ | Formula Calculator # |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/formula-calculator/id6504839903/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 5 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 17 MB | 67 MB |
| Requires iOS | 13.4 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Industrial Gas Consultants LLC](https://appshunter.io/developer/1725282233) | [威 刘](https://appshunter.io/developer/1465235012) |

## What reviewers say

### IGC H₂

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

**In-app purchases:** none


### Formula Calculator #

[App page](https://appshunter.io/ios/app/formula-calculator/id6504839903)

Perform calculations with a vast library of built-in formulas or create your own. Save and sync custom formulas to the cloud for easy access across devices. Includes a comprehensive scientific calculator.

**Highlights:** Extensive built-in calculation formulas, Create and save custom formulas, Cloud synchronization for custom formulas, Share custom formulas with others, Comprehensive scientific calculator

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month subscription | $1.49 | one-time |
| 3 months subscription | $2.49 | one-time |
| 6 months subscription | $3.49 | one-time |
| 1 year subscription | $4.49 | one-time |


## Frequently asked questions

### Is IGC H₂ free?

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

### Is Formula Calculator # free?

Formula Calculator # is free to download, with in-app purchases available.

### Do IGC H₂ or Formula Calculator # have ads?

Formula Calculator # shows ads; IGC H₂ does not.

### Which is updated more often, IGC H₂ or Formula Calculator #?

IGC H₂ ships an update every 5 days, and Formula Calculator # every 5 weeks. Most recently, IGC H₂ was updated on September 11, 2026 and Formula Calculator # on September 14, 2026.

---

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