# HVAC PT Chart vs testo Smart

The clearest difference is rating: HVAC PT Chart at 4.0 against testo Smart's 2.7. HVAC PT Chart also leads on review sentiment (56% vs 16%) and monetization model (free vs free with in-app purchases). testo Smart's advantage is ratings volume (167 vs 8) and update cadence (every 2 months vs every 4 months). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. HVAC PT Chart sells 1 one-off in-app purchase and testo Smart sells 5 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

HVAC PT Chart holds the better App Store score, 4.0 against 2.7. That said, the two scores are not equally well evidenced: testo Smart has 167 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 56% of HVAC PT Chart's written reviews are positive against 16% of testo Smart's.

HVAC PT Chart ships an update every 4 months, testo Smart every 2 months. The most recent releases landed on September 9, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | HVAC PT Chart | testo Smart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (8 ratings)](https://appshunter.io/ios/app/hvac-pt-chart/id508212589/reviews)** | [2.7 (167 ratings)](https://appshunter.io/ios/app/testo-smart/id1482139629/reviews) |
| Number of ratings | 8 | **167** |
| Positive reviews | **55.6% of reviews** | 16.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 27 MB | 195 MB |
| Requires iOS | **13.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) |

## 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 |


### testo Smart

[App page](https://appshunter.io/ios/app/testo-smart/id1482139629)

This app supports measurements for refrigeration, HVAC, and heating systems. It also aids in food safety, frying oil quality, and indoor climate monitoring. Quickly interpret data, create digital reports with photos, and send them via email.

**Highlights:** All-in-one system measurements, Graphical display of measured values, Digital PDF/CSV measurement reports, Email report sharing, Leak test analysis, Automatic refrigerant charging, Indoor air quality monitoring

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Multi-site measurement | $6.99 | per month |
| Air balancing | $9.99 | per month |
| Multi-site measurement | $69.90 | per year |
| Air balancing | $99.90 | per year |
| Logging digital manifold | $44.99 | one-time |

**What reviewers like**

- 👍 Good app with some features
- 🚀 Great product
- 🚀 Useful app for measurements

**What reviewers complain about**

- 🐛 App won't connect
- 🐛 Connectivity issues
- 🐛 Unreliable connection
- 🐛 Forced updates
- 🐛 Laggy and unresponsive UI

**Reported bugs**

- App won't connect to devices
- Compatibility issues with newer iOS versions
- Frequent crashes and freezes
- Inability to save favorite refrigerants
- Measurement data not displaying properly

**Requested features**

- Add option to toggle Bluetooth discovery
- Improve Bluetooth range
- Add ability to customize colors and graphs
- Improve data export functionality
- Add option to name sensors


## Frequently asked questions

### Is HVAC PT Chart free?

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

### Is testo Smart free?

testo Smart is free to download, with in-app purchases available.

### Which has better reviews, HVAC PT Chart or testo Smart?

HVAC PT Chart is rated higher. HVAC PT Chart averages 4.0 out of 5 from 8 ratings, while testo Smart averages 2.7 from 167 ratings.

### Do HVAC PT Chart or testo Smart have ads?

Neither HVAC PT Chart nor testo Smart shows ads.

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

HVAC PT Chart ships an update every 4 months, and testo Smart every 2 months. Most recently, HVAC PT Chart was updated on September 9, 2026 and testo Smart on September 25, 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.*