Comparison

Sizing US/CA vs ViParts

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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

About

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.

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
Read full description

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

Sizing US/CA4 screens
ViParts4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Sizing US/CA versus ViParts: the parameters behind the verdict, then further details
ParameterSizing US/CAViParts
PriceFreeFree
Rating3.2 (13 ratings) — better—
Positive reviews11.1% of reviews14.3% of reviews — better
Number of ratings13 — better—
Update frequencyEvery 6 weeksEvery 3 weeks — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS10.0 — better14.0
Further details — not scored
Size27 MB33 MB
Age rating17+4+
DeveloperGastite Products LLCViessmann IT Service GmbH

Customer experience

Sizing US/CA

All ratings13 ratings
Positive46.2%
Neutral15.4%
Negative38.5%
Written reviews9 reviews
Positive11.1%
Neutral11.1%
Negative77.8%

ViParts

Written reviews14 reviews
Positive14.3%
Neutral14.3%
Negative71.4%

In-app purchases

None

Sizing US/CA

No in-app purchases

None

ViParts

No in-app purchases

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 September 16, 2026.

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