Sizing US/CA vs Lennox Smart Tech
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
Lennox Smart Tech
Streamline the installation and servicing of compatible home comfort systems. This app allows for remote testing, diagnostics, and system setting adjustments directly from a smartphone, reducing the need to physically interact with equipment.
- Install and service home comfort systems
- Test and run diagnostics remotely
- Adjust system settings from smartphone
- Compatible with Lennox S40/L40/M40/E40 Smart Thermostats
- Direct smartphone control
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With the Lennox Smart Tech App, you'll have the latest technology to more quickly and easily install and service a fully communicating home comfort system with the Lennox S40/L40/M40/E40 Smart Thermostat. You can reliably run tests, diagnostics, and change system settings directly from your smartphone without the back and forth from equipment to thermostat.
Screenshots
Verdict
The clearest difference is rating: Lennox Smart Tech at 4.5 against Sizing US/CA's 3.2. Lennox Smart Tech also leads on ads (none vs shown) and monetization model (free vs ad-supported). Sizing US/CA's advantage is review sentiment (11% vs 0%) and iOS requirement (10.0 vs 16.0). On price, update cadence, 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.
Lennox Smart Tech holds the better App Store score, 4.5 against 3.2. Both are backed by a comparable volume of ratings — 13 and 60 respectively. Written reviews complicate that: 11% of Sizing US/CA's written reviews are positive against 0% of Lennox Smart Tech's, so the app with the better star average is not the one people write more warmly about.
Sizing US/CA ships an update every 6 weeks, Lennox Smart Tech every 2 months. The most recent releases landed on June 3, 2026 and August 15, 2026 respectively.
| Parameter | Sizing US/CA | Lennox Smart Tech |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (13 ratings) | 4.5 (60 ratings) — better |
| Positive reviews | 11.1% of reviews — better | 0.0% of reviews |
| Number of ratings | 13 | 60 — better |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 10.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 27 MB | 98 MB |
| Age rating | 17+ | 4+ |
| Developer | Gastite Products LLC | Lennox Industries |
Customer experience
Sizing US/CA
Lennox Smart Tech
In-app purchases
Sizing US/CA
No in-app purchases
Lennox Smart Tech
No in-app purchases
Questions
Is Sizing US/CA free?
Is Lennox Smart Tech free?
Which has better reviews, Sizing US/CA or Lennox Smart Tech?
Do Sizing US/CA or Lennox Smart Tech have ads?
Which is updated more often, Sizing US/CA or Lennox Smart Tech?
Other comparisons
