Sizing US/CA vs ViParts
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sizing US/CA
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.
- Flexible gas pipe sizing
- US and CA location selector
- Automatic value adjustment
- Certification card access
- Installation guide viewer
- Product search
- Direct contact with developer
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Size Gastite® and FlashShield™ flexible gas piping with this convenient and easy-to-use application for the iPhone. This app allows flexible gas pipe installers to determine the appropriate size Gastite pipe recommended for the installation at hand. Based on the project’s gas type, length of tubing run, supply pressure, pressure drop, and flow capacity – the app will calculate the appropriate size Gastite/FlashShield CSST for your application. Features : Includes a location selector for US and CA Scroll wheel automatically adjusts depending on values selected Find your certification card to link a digital version to your device FAQs View the latest Design and Installation Guide Search for Gastite and FlashShield products Contact Page submits questions and requests directly to Gastite The Gastite and FlashShield flexible gas piping systems are designed and warranted to provide sufficient gas volume and pressure for proper appliance performance using the appropriate sizing tables and methods detailed in the Design and Installation Guide and this Mobile Sizing App. Accordingly, the design pressure loss on the Gastite and FlashShield piping system under maximum probable flow conditions, from the point of delivery to the inlet connection of the equipment shall be such that the supply pressure at the equipment is greater than the minimum pressure required for proper equipment operation. Minimum Requirements - iOS version 8
ViParts
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.
- 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
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The Viessmann ViParts app offers you as a Viessmann partner the opportunity to see all information about our spare parts and order them directly. The following functions are available in ViParts: - Identification of all spare part in exploded drawings and parts lists - Barcode scanner for reading in material numbers - Display of all maintenance parts for the products - Compatibility check between product and spare part - Ordering of spare parts - Availability of all technical documents - Display of availability and prices (with login)
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 September 16, 2026 respectively.
| Parameter | Sizing US/CA | ViParts |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (13 ratings) — better | — |
| Positive reviews | 11.1% of reviews | 14.3% of reviews — better |
| Number of ratings | 13 — better | — |
| Update frequency | Every 6 weeks | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 10.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 27 MB | 33 MB |
| Age rating | 17+ | 4+ |
| Developer | Gastite Products LLC | Viessmann IT Service GmbH |
Customer experience
Sizing US/CA
ViParts
In-app purchases
Sizing US/CA
No in-app purchases
ViParts
No in-app purchases









