# Sizing US/CA vs ViParts

The clearest difference is ads: ViParts at none against Sizing US/CA's shown. ViParts also leads on monetization model (free vs ad-supported) and update cadence (every 3 weeks vs every 6 weeks). Sizing US/CA's advantage is iOS requirement (10.0 vs 14.0). On price, review sentiment, in-app purchases and device support there is nothing between them.

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

Sizing US/CA ships an update every 6 weeks, ViParts every 3 weeks. The most recent releases landed on September 30, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Sizing US/CA | ViParts |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.2 (13 ratings)](https://appshunter.io/ios/app/sizing-usca/id1420112805/reviews)** | — |
| Number of ratings | **13** | — |
| Positive reviews | 11.1% of reviews | **14.3% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Ad-supported | **Free** |
| Size | 27 MB | 34 MB |
| Requires iOS | **10.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Gastite Products LLC](https://appshunter.io/developer/668653608) | [Viessmann IT Service GmbH](https://appshunter.io/developer/1801739683) |

## What reviewers say

### Sizing US/CA

[App page](https://appshunter.io/ios/app/sizing-usca/id1420112805)

This utility app helps installers determine the correct size of flexible gas piping for their projects. It calculates the appropriate pipe size based on gas type, tubing length, supply pressure, and flow capacity. Users can also access installation guides and product information.

**Highlights:** Flexible gas pipe sizing, US and CA location selector, Automatic value adjustment, Certification card access, Installation guide viewer, Product search, Direct contact with developer

**Features:** macOS Compatibility

**In-app purchases:** none


### ViParts

[App page](https://appshunter.io/ios/app/viparts/id6477911742)

Access comprehensive information on spare parts and place orders directly. Identify parts using exploded drawings, barcode scanning, and compatibility checks. View technical documents and check availability and pricing.

**Highlights:** Spare part identification via exploded drawings, Barcode scanner for material numbers, Maintenance parts display, Product and spare part compatibility check, Direct spare part ordering, Access to technical documents, Availability and price display

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sizing US/CA free?

Sizing US/CA is free to download, with no in-app purchases.

### Is ViParts free?

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

### Do Sizing US/CA or ViParts have ads?

Sizing US/CA shows ads; ViParts does not.

### Which is updated more often, Sizing US/CA or ViParts?

Sizing US/CA ships an update every 6 weeks, and ViParts every 3 weeks. Most recently, Sizing US/CA was updated on September 30, 2026 and ViParts on October 3, 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.*