# TPI Smart Probe vs Sizing US/CA

The clearest difference is ads: TPI Smart Probe at none against Sizing US/CA's shown. TPI Smart Probe also leads on iOS requirement (8.0 vs 10.0). 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.

TPI Smart Probe ships an update monthly, Sizing US/CA every 6 weeks. The most recent releases landed on October 12, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | TPI Smart Probe | Sizing US/CA |
| --- | --- | --- |
| 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 |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 6 weeks |
| Monetization | — | Ad-supported |
| Size | 123 MB | 27 MB |
| Requires iOS | **8.0** | 10.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Yong Dae Lee](https://appshunter.io/developer/1336256947) | [Gastite Products LLC](https://appshunter.io/developer/668653608) |

## What reviewers say

### TPI Smart Probe

[App page](https://appshunter.io/ios/app/tpi-smart-probe/id1414141603)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is TPI Smart Probe free?

TPI Smart Probe is free to download, with no in-app purchases.

### Is Sizing US/CA free?

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

### Do TPI Smart Probe or Sizing US/CA have ads?

Sizing US/CA shows ads; TPI Smart Probe does not.

### Which is updated more often, TPI Smart Probe or Sizing US/CA?

TPI Smart Probe ships an update monthly, and Sizing US/CA every 6 weeks. Most recently, TPI Smart Probe was updated on October 12, 2026 and Sizing US/CA on October 16, 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.*