# IGases Calculator vs FlatWall

The clearest difference is in-app purchases: IGases Calculator at none against FlatWall's 1. IGases Calculator also leads on iOS requirement (14.0 vs 16.0). FlatWall's advantage is update cadence (fortnightly vs every 19 months). On price, ads and device support there is nothing between them.

Both are free to download. FlatWall sells 1 one-off in-app purchase. IGases Calculator asks for nothing beyond the download.

IGases Calculator ships an update every 19 months, FlatWall fortnightly. The most recent releases landed on October 4, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | IGases Calculator | FlatWall |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/igases-calculator/id1662802822/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 19 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 38 MB | 79 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Faris Obaid ullah](https://appshunter.io/developer/1662802824) | [Mohammad Ahmad](https://appshunter.io/developer/1821958805) |

## What reviewers say

### IGases Calculator

[App page](https://appshunter.io/ios/app/igases-calculator/id1662802822)

This app provides a comprehensive reference for industrial, medical, and specialized gases. It includes a unit converter to easily switch between international measurement units, helping users select the appropriate gas.

**Highlights:** Industrial gas reference, Medical gas reference, Specialized gas reference, Unit converter, International unit conversion

**Features:** macOS Compatibility

**In-app purchases:** none


### FlatWall

[App page](https://appshunter.io/ios/app/flatwall/id6747599083)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $12.99 | one-time |


## Frequently asked questions

### Is IGases Calculator free?

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

### Is FlatWall free?

FlatWall is free to download, with in-app purchases available.

### Do IGases Calculator or FlatWall have ads?

Neither IGases Calculator nor FlatWall shows ads.

### Which is updated more often, IGases Calculator or FlatWall?

IGases Calculator ships an update every 19 months, and FlatWall fortnightly. Most recently, IGases Calculator was updated on October 4, 2026 and FlatWall on October 12, 2026.

---

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