# HVAC RefCharge vs SmarTech

The clearest difference is price: SmarTech at Free against HVAC RefCharge's $9.99. SmarTech also leads on in-app purchases (none vs 1). HVAC RefCharge's advantage is review sentiment (33% vs 25%). On update cadence, ads, device support and iOS requirement there is nothing between them.

SmarTech is free to download; HVAC RefCharge costs $9.99 up front. HVAC RefCharge sells 1 one-off in-app purchase. SmarTech asks for nothing beyond the download.

HVAC RefCharge ships an update every 11 months, SmarTech every 12 months. The most recent releases landed on September 21, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | HVAC RefCharge | SmarTech |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[3.6 (9 ratings)](https://appshunter.io/ios/app/smartech/id1071783318/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | **33.3% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 11 months** | Every 12 months |
| Monetization | Paid | **Free** |
| Size | 22 MB | 21 MB |
| Requires iOS | 15.6 | 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 RefCharge

[App page](https://appshunter.io/ios/app/hvac-refcharge/id577005428)

This app helps HVAC technicians quickly calculate refrigerant superheat and subcool levels. It supports over 100 refrigerants and offers interactive adjustments for precise charging decisions. Features include atmospheric pressure adjustments and unit customization.

**Highlights:** Superheat and subcool calculations, Supports 100+ refrigerants, Interactive slider for adjustments, Atmospheric pressure compensation, Customizable input types, Project photo assignment, Email report generation, English/Metric unit display

**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 RefCharge free?

HVAC RefCharge costs $9.99, and also offers in-app purchases.

### Is SmarTech free?

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

### Do HVAC RefCharge or SmarTech have ads?

Neither HVAC RefCharge nor SmarTech shows ads.

### Which is updated more often, HVAC RefCharge or SmarTech?

HVAC RefCharge ships an update every 11 months, and SmarTech every 12 months. Most recently, HVAC RefCharge was updated on September 21, 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.*