# GB Gas Purging Calculator vs GasCalc Pro

The clearest difference is price: GasCalc Pro at Free against GB Gas Purging Calculator's $4.99. GB Gas Purging Calculator's advantage is iOS requirement (16.6 vs 26.5). On update cadence, ads, in-app purchases and device support there is nothing between them.

GasCalc Pro is free to download; GB Gas Purging Calculator costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GB Gas Purging Calculator ships an update every 12 months, GasCalc Pro every 7 months. The most recent releases landed on November 1, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | GB Gas Purging Calculator | GasCalc Pro |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 7 months** |
| Size | 1 MB | 3 MB |
| Requires iOS | **16.6** | 26.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [GB-GAS.CO.UK](https://appshunter.io/developer/425897007) | [Nergiz Calhan](https://appshunter.io/developer/547527777) |

## What reviewers say

### GB Gas Purging Calculator

[App page](https://appshunter.io/ios/app/gb-gas-purging-calculator/id426227084)

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

**In-app purchases:** none


### GasCalc Pro

[App page](https://appshunter.io/ios/app/gascalc-pro/id6748356723)

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

**In-app purchases:** none


## Frequently asked questions

### Is GB Gas Purging Calculator free?

GB Gas Purging Calculator costs $4.99, with no in-app purchases.

### Is GasCalc Pro free?

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

### Do GB Gas Purging Calculator or GasCalc Pro have ads?

Neither GB Gas Purging Calculator nor GasCalc Pro shows ads.

### Which is updated more often, GB Gas Purging Calculator or GasCalc Pro?

GB Gas Purging Calculator ships an update every 12 months, and GasCalc Pro every 7 months. Most recently, GB Gas Purging Calculator was updated on November 1, 2026 and GasCalc Pro on October 25, 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.*