# Sizing US/CA vs Lennox Smart Tech

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.

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.

## The numbers

| Metric | Sizing US/CA | Lennox Smart Tech |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.2 (13 ratings)](https://appshunter.io/ios/app/sizing-usca/id1420112805/reviews) | **[4.5 (60 ratings)](https://appshunter.io/ios/app/lennox-smart-tech/id6443907644/reviews)** |
| Number of ratings | 13 | **60** |
| Positive reviews | **11.1% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Ad-supported | **Free** |
| Size | 27 MB | 98 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Gastite Products LLC](https://appshunter.io/developer/668653608) | [Lennox Industries](https://appshunter.io/developer/355049651) |

## 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


### Lennox Smart Tech

[App page](https://appshunter.io/ios/app/lennox-smart-tech/id6443907644)

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.

**Highlights:** 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

**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 Lennox Smart Tech free?

Lennox Smart Tech is free to download, with no in-app purchases.

### Which has better reviews, Sizing US/CA or Lennox Smart Tech?

Lennox Smart Tech is rated higher. Sizing US/CA averages 3.2 out of 5 from 13 ratings, while Lennox Smart Tech averages 4.5 from 60 ratings.

### Do Sizing US/CA or Lennox Smart Tech have ads?

Sizing US/CA shows ads; Lennox Smart Tech does not.

### Which is updated more often, Sizing US/CA or Lennox Smart Tech?

Sizing US/CA ships an update every 6 weeks, and Lennox Smart Tech every 2 months. Most recently, Sizing US/CA was updated on June 3, 2026 and Lennox Smart Tech on August 15, 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.*