# 3D Interpolation vs Thermal Transmittance Calc

The clearest difference is review sentiment: Thermal Transmittance Calc at 75% against 3D Interpolation's 0%. Thermal Transmittance Calc also leads on price (Free vs $9.99) and update cadence (every 11 months vs every 37 months). 3D Interpolation's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

Thermal Transmittance Calc is free to download; 3D Interpolation costs $9.99 up front. Thermal Transmittance Calc sells 2 one-off in-app purchases. 3D Interpolation asks for nothing beyond the download.

3D Interpolation ships an update every 37 months, Thermal Transmittance Calc every 11 months. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 3D Interpolation | Thermal Transmittance Calc |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[4.1 (11 ratings)](https://appshunter.io/ios/app/thermal-transmittance-calc/id1473745621/reviews)** |
| Number of ratings | — | **11** |
| Positive reviews | 0.0% of reviews | **75.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 37 months | **Every 11 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 7 MB | 119 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carlos Moura](https://appshunter.io/developer/407501202) | [ALEXEY KOZLOV](https://appshunter.io/developer/1393860478) |

## What reviewers say

### 3D Interpolation

[App page](https://appshunter.io/ios/app/3d-interpolation/id1000298349)

Calculate key directional drilling parameters like TVD, coordinates, and displacement. This tool aids drilling engineers and students in oil well directional drilling by interpolating survey data.

**Highlights:** Calculate TVD, N/S, E/W coordinates, Determine Horizontal Displacement, Calculate Dog-Leg Severity, Measure Build-Up Rate, Calculate Turn Rate, Interpolate parameters between survey stations

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

**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 3D Interpolation free?

3D Interpolation costs $9.99, with no in-app purchases.

### Is Thermal Transmittance Calc free?

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

### Do 3D Interpolation or Thermal Transmittance Calc have ads?

Thermal Transmittance Calc shows ads; 3D Interpolation does not.

### Which is updated more often, 3D Interpolation or Thermal Transmittance Calc?

3D Interpolation ships an update every 37 months, and Thermal Transmittance Calc every 11 months. Most recently, 3D Interpolation was updated on October 19, 2026 and Thermal Transmittance Calc on October 24, 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.*