# WinUw ROLLTECH vs Thermal Transmittance Calc

The clearest difference is in-app purchases: WinUw ROLLTECH at none against Thermal Transmittance Calc's 2. WinUw ROLLTECH also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Thermal Transmittance Calc sells 2 one-off in-app purchases. WinUw ROLLTECH asks for nothing beyond the download.

WinUw ROLLTECH ships an update every 25 months, Thermal Transmittance Calc every 15 months. The most recent releases landed on September 17, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | WinUw ROLLTECH | Thermal Transmittance Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.1 (10 ratings)](https://appshunter.io/ios/app/thermal-transmittance-calc/id1473745621/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 25 months | **Every 15 months** |
| Monetization | — | Free with in-app purchases |
| Size | 50 MB | 98 MB |
| Requires iOS | **14.5** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sommer Informatik GmbH](https://appshunter.io/developer/634307623) | [ALEXEY KOZLOV](https://appshunter.io/developer/1393860478) |

## What reviewers say

### WinUw ROLLTECH

[App page](https://appshunter.io/ios/app/winuw-rolltech/id1058903835)

**Features:** macOS Compatibility

**In-app purchases:** none


### Thermal Transmittance Calc

[App page](https://appshunter.io/ios/app/thermal-transmittance-calc/id1473745621)

Calculate heat loss and humidity issues in building structures. Input air temperature, humidity, and material layers to visualize temperature and dew point changes. Supports both Celsius/Fahrenheit and cm/inches.

**Highlights:** Calculate heat loss, Identify humidity problems, Visualize temperature and dew point changes, Supports Celsius and Fahrenheit, Supports centimeters and inches, Easy data entry and immediate results

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |
| Creating a new material | $2.99 | one-time |


## Frequently asked questions

### Is WinUw ROLLTECH free?

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

### Is Thermal Transmittance Calc free?

Thermal Transmittance Calc is free to download, with in-app purchases available.

### Do WinUw ROLLTECH or Thermal Transmittance Calc have ads?

Thermal Transmittance Calc shows ads; WinUw ROLLTECH does not.

### Which is updated more often, WinUw ROLLTECH or Thermal Transmittance Calc?

WinUw ROLLTECH ships an update every 25 months, and Thermal Transmittance Calc every 15 months. Most recently, WinUw ROLLTECH was updated on September 17, 2026 and Thermal Transmittance Calc on September 10, 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.*