# Thermal Transmittance Calc vs SplitFlap

The clearest difference is price: Thermal Transmittance Calc at Free against SplitFlap's $1.99. Thermal Transmittance Calc also leads on review sentiment (67% vs 22%) and rating (4.1 vs 1.9). SplitFlap's advantage is in-app purchases (none vs 2) and ads (none vs shown). On ratings volume, device support and iOS requirement there is nothing between them.

Thermal Transmittance Calc is free to download; SplitFlap costs $1.99 up front. Thermal Transmittance Calc sells 2 one-off in-app purchases. SplitFlap asks for nothing beyond the download.

Thermal Transmittance Calc holds the better App Store score, 4.1 against 1.9. Both are backed by a comparable volume of ratings — 10 and 8 respectively. Written reviews point the same way: 67% of Thermal Transmittance Calc's written reviews are positive against 22% of SplitFlap's.

Thermal Transmittance Calc ships an update every 15 months, SplitFlap weekly. Both last shipped on September 10, 2026.

## The numbers

| Metric | Thermal Transmittance Calc | SplitFlap |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.1 (10 ratings)](https://appshunter.io/ios/app/thermal-transmittance-calc/id1473745621/reviews)** | [1.9 (8 ratings)](https://appshunter.io/ios/app/splitflap/id1502598345/reviews) |
| Number of ratings | **10** | 8 |
| Positive reviews | **66.7% of reviews** | 22.2% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 15 months | **Weekly** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 98 MB | 37 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ALEXEY KOZLOV](https://appshunter.io/developer/1393860478) | [Rico Obrist](https://appshunter.io/developer/1222506874) |

## What reviewers say

### 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 |


### SplitFlap

[App page](https://appshunter.io/ios/app/splitflap/id1502598345)

This application simulates the function of a split-flap display board. It individually controls each of the 132 flaps to create a realistic scrolling effect. The app aims to eventually control a physical split-flap board.

**Highlights:** Simulates split-flap display function, Controls 132 individual flaps, Realistic scrolling effect, Uses separate threads for each flap, Future control of physical boards

**In-app purchases:** none


## Frequently asked questions

### Is Thermal Transmittance Calc free?

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

### Is SplitFlap free?

SplitFlap costs $1.99, with no in-app purchases.

### Which has better reviews, Thermal Transmittance Calc or SplitFlap?

Thermal Transmittance Calc is rated higher. Thermal Transmittance Calc averages 4.1 out of 5 from 10 ratings, while SplitFlap averages 1.9 from 8 ratings.

### Do Thermal Transmittance Calc or SplitFlap have ads?

Thermal Transmittance Calc shows ads; SplitFlap does not.

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

Thermal Transmittance Calc ships an update every 15 months, and SplitFlap weekly. Most recently, Thermal Transmittance Calc was updated on September 10, 2026 and SplitFlap 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.*