# ViGuide vs Gastite Sizing App

The clearest difference is review sentiment: Gastite Sizing App at 100% against ViGuide's 41%. Gastite Sizing App also leads on iOS requirement (13.0 vs 16.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ViGuide ships an update every 6 weeks, Gastite Sizing App every 3 weeks. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | ViGuide | Gastite Sizing App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (207 ratings)](https://appshunter.io/ios/app/viguide/id1421720639/reviews)** | — |
| Number of ratings | **207** | — |
| Positive reviews | 40.5% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 1.5 GB | 15 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Viessmann IT Service GmbH](https://appshunter.io/developer/1801739683) | [Gastite Systems Limited](https://appshunter.io/developer/1537998855) |

## What reviewers say

### ViGuide

[App page](https://appshunter.io/ios/app/viguide/id1421720639)

Streamline the process of commissioning Viessmann boilers with this user-friendly mobile application. It guides trained professionals through each step, ensuring a safe, efficient, and complete installation.

**Highlights:** Streamlined boiler commissioning, User-friendly mobile interface, Step-by-step guidance, Ensures complete and correct steps, Efficient installation process

**Features:** Vision Pro support

**In-app purchases:** none


### Gastite Sizing App

[App page](https://appshunter.io/ios/app/gastite-sizing-app/id1537998852)

This app simplifies calculating the required size of Gastite® CSST for gas installations. Input gas type, CSST length, and appliance power to instantly determine the correct size. It offers easy navigation, user-friendly design, and access to FAQs and installation guides.

**Highlights:** CSST sizing calculation, Natural gas or LPG selection, Access to FAQs, Downloadable installation guide, User-friendly design, Contact support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ViGuide free?

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

### Is Gastite Sizing App free?

Gastite Sizing App is free to download, with no in-app purchases.

### Do ViGuide or Gastite Sizing App have ads?

Neither ViGuide nor Gastite Sizing App shows ads.

### Which is updated more often, ViGuide or Gastite Sizing App?

ViGuide ships an update every 6 weeks, and Gastite Sizing App every 3 weeks. Most recently, ViGuide was updated on October 24, 2026 and Gastite Sizing App on October 10, 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.*