# RadonEye+² vs Thermal Transmittance Calc

The clearest difference is review sentiment: Thermal Transmittance Calc at 75% against RadonEye+²'s 0%. Thermal Transmittance Calc also leads on rating (4.1 vs 1.0) and ratings volume (11 vs 3). RadonEye+²'s advantage is in-app purchases (none vs 2) and ads (none vs shown). On price and device support there is nothing between them.

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

Thermal Transmittance Calc holds the better App Store score, 4.1 against 1.0. Both are backed by a comparable volume of ratings — 3 and 11 respectively. Written reviews point the same way: 0% of RadonEye+²'s written reviews are positive against 75% of Thermal Transmittance Calc's.

RadonEye+² ships an update monthly, Thermal Transmittance Calc every 11 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | RadonEye+² | Thermal Transmittance Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (3 ratings)](https://appshunter.io/ios/app/radoneye-plus/id1441638944/reviews) | **[4.1 (11 ratings)](https://appshunter.io/ios/app/thermal-transmittance-calc/id1473745621/reviews)** |
| Number of ratings | 3 | **11** |
| Positive reviews | 0.0% of reviews | **75.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 11 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 59 MB | 119 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FTLab](https://appshunter.io/developer/897369751) | [ALEXEY KOZLOV](https://appshunter.io/developer/1393860478) |

## What reviewers say

### RadonEye+²

[App page](https://appshunter.io/ios/app/radoneye-plus/id1441638944)

This mobile application connects with the RadonEye+² radon detector to monitor radon levels. View logged data, download historical measurements, and visualize radon concentration over time with graphs.

**Highlights:** Connects with RadonEye+² detector, Monitor radon measurements, Download log data, View historical data graphs, Track radon concentration over time

**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 RadonEye+² free?

RadonEye+² 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.

### Which has better reviews, RadonEye+² or Thermal Transmittance Calc?

Thermal Transmittance Calc is rated higher. RadonEye+² averages 1.0 out of 5 from 3 ratings, while Thermal Transmittance Calc averages 4.1 from 11 ratings.

### Do RadonEye+² or Thermal Transmittance Calc have ads?

Thermal Transmittance Calc shows ads; RadonEye+² does not.

### Which is updated more often, RadonEye+² or Thermal Transmittance Calc?

RadonEye+² ships an update monthly, and Thermal Transmittance Calc every 11 months. Most recently, RadonEye+² was updated on November 2, 2026 and Thermal Transmittance Calc on November 3, 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.*