# Heat Engineer vs FireAngel Connected

The clearest difference is review sentiment: Heat Engineer at 79% against FireAngel Connected's 18%. FireAngel Connected's advantage is in-app purchases (none vs 1). On price, update cadence, ads and monetization model there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on August 5, 2026 and August 10, 2026 respectively.

## The numbers

| Metric | Heat Engineer | FireAngel Connected |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **78.9% of reviews** | 17.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | Free |
| Size | 44 MB | 53 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) | [Sprue](https://appshunter.io/developer/1086594448) |

## 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 |


### FireAngel Connected

[App page](https://appshunter.io/ios/app/fireangel-connected/id1477171244)

Enhance your home's fire and CO safety with instant mobile alerts. Easily test alarms and monitor the safety networks of your household and loved ones.

**Highlights:** Instant mobile alerts, Remote alarm testing, Home safety network monitoring, Family safety network monitoring, CO safety updates

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Heat Engineer free?

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

### Is FireAngel Connected free?

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

### Do Heat Engineer or FireAngel Connected have ads?

Neither Heat Engineer nor FireAngel Connected shows ads.

### Which is updated more often, Heat Engineer or FireAngel Connected?

Heat Engineer ships an update every 2 months, and FireAngel Connected every 2 months. Most recently, Heat Engineer was updated on August 5, 2026 and FireAngel Connected on August 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.*