# Heat Engineer vs QGEMS

The clearest difference is in-app purchases: QGEMS at none against Heat Engineer's 1. On price, update cadence, ads and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 18, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Heat Engineer | QGEMS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 78.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 306 MB | 247 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) | [QGEMS](https://appshunter.io/developer/1766705834) |

## 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 |


### QGEMS

[App page](https://appshunter.io/ios/app/qgems/id6670541534)

**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 QGEMS free?

QGEMS is free to download, with no in-app purchases.

### Do Heat Engineer or QGEMS have ads?

Neither Heat Engineer nor QGEMS shows ads.

### Which is updated more often, Heat Engineer or QGEMS?

Heat Engineer ships an update every 2 months, and QGEMS every 2 months. Most recently, Heat Engineer was updated on October 18, 2026 and QGEMS on September 30, 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.*