# Heat Engineer vs Vieweet 3D

The clearest difference is in-app purchases: Vieweet 3D at none against Heat Engineer's 1. Vieweet 3D also leads on update cadence (every 5 days vs every 2 months). Heat Engineer's advantage is iOS requirement (15.6 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Heat Engineer sells 1 one-off in-app purchase. Vieweet 3D asks for nothing beyond the download.

Heat Engineer ships an update every 2 months, Vieweet 3D every 5 days. The most recent releases landed on August 5, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Heat Engineer | Vieweet 3D |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 78.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free | — |
| Size | 44 MB | 156 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) | [Virtual View App Ltd](https://appshunter.io/developer/669447315) |

## What reviewers say

### Heat Engineer

[App page](https://appshunter.io/ios/app/heat-engineer/id879510552)

This app assists heating engineers and surveyors in collecting property data for heating system installations. It supports heat loss reports for various technologies and includes tools for sound assessments and quick estimations. Data is automatically saved for later review and amendment.

**Highlights:** Heat loss survey for BS EN 12831, CIBSE, and MCS standards, MCS 020 sound assessment for Air Source Heat Pumps, Quick heat loss estimator tool, Automatic data saving and history for amendments, Room-by-room heat loss calculation, Photo capture for rooms and installation locations, Fuel comparisons and running cost calculations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MCS 020 PDF Report Token | $2.99 | one-time |


### Vieweet 3D

[App page](https://appshunter.io/ios/app/vieweet-3d/id6761068437)

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

**In-app purchases:** none


## Frequently asked questions

### Is Heat Engineer free?

Heat Engineer is free to download, with in-app purchases available.

### Is Vieweet 3D free?

Vieweet 3D is free to download, with no in-app purchases.

### Do Heat Engineer or Vieweet 3D have ads?

Neither Heat Engineer nor Vieweet 3D shows ads.

### Which is updated more often, Heat Engineer or Vieweet 3D?

Heat Engineer ships an update every 2 months, and Vieweet 3D every 5 days. Most recently, Heat Engineer was updated on August 5, 2026 and Vieweet 3D 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.*