# Affinity vs Thermal Transmittance Calc

The clearest difference is in-app purchases: Affinity at none against Thermal Transmittance Calc's 2. Affinity also leads on ads (none vs shown) and iOS requirement (12.0 vs 15.6). Thermal Transmittance Calc's advantage is update cadence (every 11 months vs every 54 months). 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. Affinity asks for nothing beyond the download.

Affinity ships an update every 54 months, Thermal Transmittance Calc every 11 months. The most recent releases landed on October 11, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Affinity | 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 | — | 75.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 54 months | **Every 11 months** |
| Monetization | — | Free with in-app purchases |
| Size | 40 MB | 119 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [DESCANSARE SLEEP LAB SOCIEDAD LIMITADA](https://appshunter.io/developer/1015892441) | [ALEXEY KOZLOV](https://appshunter.io/developer/1393860478) |

## What reviewers say

### Affinity

[App page](https://appshunter.io/ios/app/affinity/id1168976557)

**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 Affinity free?

Affinity 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 Affinity or Thermal Transmittance Calc have ads?

Thermal Transmittance Calc shows ads; Affinity does not.

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

Affinity ships an update every 54 months, and Thermal Transmittance Calc every 11 months. Most recently, Affinity was updated on October 11, 2026 and Thermal Transmittance Calc on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*