# GB Gas Ventilation Calculator vs Compass Tracking

The clearest difference is price: Compass Tracking at Free against GB Gas Ventilation Calculator's $3.99. Compass Tracking also leads on update cadence (every 2 months vs every 14 months) and iOS requirement (12.1 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

Compass Tracking is free to download; GB Gas Ventilation Calculator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GB Gas Ventilation Calculator ships an update every 14 months, Compass Tracking every 2 months. The most recent releases landed on November 1, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | GB Gas Ventilation Calculator | Compass Tracking |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 3 MB | 25 MB |
| Requires iOS | 26.0 | **12.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GB-GAS.CO.UK](https://appshunter.io/developer/425897007) | [Compass Asset Protection Ltd](https://appshunter.io/developer/571366505) |

## What reviewers say

### GB Gas Ventilation Calculator

[App page](https://appshunter.io/ios/app/gb-gas-ventilation-calculator/id426220160)

Calculate ventilation requirements for gas appliances, including open flued, room sealed, and flueless types. Determine free air area for existing and new vents to ensure suitability for appliances. Simplifies complex calculations by reading appliance data directly.

**Highlights:** Ventilation calculations for gas appliances, Supports open flued, room sealed, and flueless types, Calculates for multiple appliances in one room, Determines free air area of vents, Reads appliance data directly

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

**In-app purchases:** none


### Compass Tracking

[App page](https://appshunter.io/ios/app/compass-tracking/id1243388802)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GB Gas Ventilation Calculator free?

GB Gas Ventilation Calculator costs $3.99, with no in-app purchases.

### Is Compass Tracking free?

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

### Do GB Gas Ventilation Calculator or Compass Tracking have ads?

Neither GB Gas Ventilation Calculator nor Compass Tracking shows ads.

### Which is updated more often, GB Gas Ventilation Calculator or Compass Tracking?

GB Gas Ventilation Calculator ships an update every 14 months, and Compass Tracking every 2 months. Most recently, GB Gas Ventilation Calculator was updated on November 1, 2026 and Compass Tracking on October 26, 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.*