# HVAC PT Chart vs SmarTech

The clearest difference is in-app purchases: SmarTech at none against HVAC PT Chart's 1. HVAC PT Chart's advantage is rating (4.0 vs 3.6) and review sentiment (56% vs 25%). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. HVAC PT Chart sells 1 one-off in-app purchase. SmarTech asks for nothing beyond the download.

HVAC PT Chart holds the better App Store score, 4.0 against 3.6. Both are backed by a comparable volume of ratings — 8 and 9 respectively. Written reviews point the same way: 56% of HVAC PT Chart's written reviews are positive against 25% of SmarTech's.

HVAC PT Chart ships an update every 4 months, SmarTech every 12 months. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | HVAC PT Chart | SmarTech |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (8 ratings)](https://appshunter.io/ios/app/hvac-pt-chart/id508212589/reviews)** | [3.6 (9 ratings)](https://appshunter.io/ios/app/smartech/id1071783318/reviews) |
| Number of ratings | 8 | **9** |
| Positive reviews | **55.6% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 12 months |
| Monetization | Free | Free |
| Size | 27 MB | 21 MB |
| Requires iOS | **13.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Uniweld Products, Inc.](https://appshunter.io/developer/1097526384) |

## What reviewers say

### HVAC PT Chart

[App page](https://appshunter.io/ios/app/hvac-pt-chart/id508212589)

This tool provides HVAC technicians with instant access to pressure and temperature data for over 100 refrigerants. It allows users to input one value to find the other, view detailed refrigerant properties, and email comprehensive charts and data.

**Highlights:** Pressure/temperature lookup for 100+ refrigerants, Input temperature to find pressure, or vice versa, Slider control for precise value selection, Email complete PT chart lists and refrigerant properties, Display common refrigerant properties, Adjust for atmospheric pressure based on city elevation, English and Metric unit options

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### SmarTech

[App page](https://appshunter.io/ios/app/smartech/id1071783318)

This app connects to a digital manifold to display accurate pressure and temperature readings. It offers real-time Superheat and Subcooling calculations, supports over 109 refrigerants, and features a "Smart Charge Zone" for optimal system charging. Users can also generate and export system performance reports.

**Highlights:** Real-time pressure and temperature readings, Superheat and Subcooling calculations, 109+ refrigerant types supported, Smart Charge Zone indicator, System performance reporting, PDF/CSV report export

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HVAC PT Chart free?

HVAC PT Chart is free to download, with in-app purchases available.

### Is SmarTech free?

SmarTech is free to download, with no in-app purchases.

### Which has better reviews, HVAC PT Chart or SmarTech?

HVAC PT Chart is rated higher. HVAC PT Chart averages 4.0 out of 5 from 8 ratings, while SmarTech averages 3.6 from 9 ratings.

### Do HVAC PT Chart or SmarTech have ads?

Neither HVAC PT Chart nor SmarTech shows ads.

### Which is updated more often, HVAC PT Chart or SmarTech?

HVAC PT Chart ships an update every 4 months, and SmarTech every 12 months. Most recently, HVAC PT Chart was updated on September 9, 2026 and SmarTech on June 1, 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.*