# HVAC Formulator vs testo Thermography

The clearest difference is price: testo Thermography at Free against HVAC Formulator's $4.99. testo Thermography also leads on rating (3.0 vs 2.0) and in-app purchases (none vs 1). HVAC Formulator's advantage is update cadence (every 2 months vs every 6 months). On ratings volume, ads and device support there is nothing between them.

testo Thermography is free to download; HVAC Formulator costs $4.99 up front. HVAC Formulator sells 1 one-off in-app purchase. testo Thermography asks for nothing beyond the download.

testo Thermography holds the better App Store score, 3.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews point the same way: 9% of HVAC Formulator's written reviews are positive against 31% of testo Thermography's.

HVAC Formulator ships an update every 2 months, testo Thermography every 6 months. The most recent releases landed on October 18, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | HVAC Formulator | testo Thermography |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews) | **[3.0 (2 ratings)](https://appshunter.io/ios/app/testo-thermography/id1123010537/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | 9.1% of reviews | **31.3% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Paid | **Free** |
| Size | 73 MB | 63 MB |
| Requires iOS | 18.6 | **13** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178) |

## What reviewers say

### HVAC Formulator

[App page](https://appshunter.io/ios/app/hvac-formulator/id318898907)

This app provides HVAC professionals with over 900 essential formulas and calculations for load calculations and system design. It supports both US and Metric units, offers instant switching, and includes 23 calculator categories and over 460 unit conversions. Designed for field use, it works offline and allows users to save and share results.

**Highlights:** Over 900 formulas and calculations, US & Metric unit support, 23 calculator categories, 460+ unit conversions, 8 temperature scales, Offline functionality, Save and share results

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Pro | $3.99 | one-time |


### testo Thermography

[App page](https://appshunter.io/ios/app/testo-thermography/id1123010537)

This free application enhances the functionality of specific testo thermal imagers. It allows users to view live images, remotely control the device, and transfer stored images for analysis and report creation. Reports and images can be easily shared via email or cloud services.

**Highlights:** Live thermal imager view, Remote device control, Image and data transmission, Thermal image analysis, Report creation, Email and cloud sharing

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Formulator free?

HVAC Formulator costs $4.99, and also offers in-app purchases.

### Is testo Thermography free?

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

### Which has better reviews, HVAC Formulator or testo Thermography?

testo Thermography is rated higher. HVAC Formulator averages 2.0 out of 5 from 1 ratings, while testo Thermography averages 3.0 from 2 ratings.

### Do HVAC Formulator or testo Thermography have ads?

Neither HVAC Formulator nor testo Thermography shows ads.

### Which is updated more often, HVAC Formulator or testo Thermography?

HVAC Formulator ships an update every 2 months, and testo Thermography every 6 months. Most recently, HVAC Formulator was updated on October 18, 2026 and testo Thermography on October 29, 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.*