# Heat Engineer vs ESi Centro Smart

The clearest difference is review sentiment: Heat Engineer at 79% against ESi Centro Smart's 0%. ESi Centro Smart's advantage is in-app purchases (none vs 1) and iOS requirement (8.0 vs 16.4). 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. ESi Centro Smart asks for nothing beyond the download.

Heat Engineer ships an update every 2 months, ESi Centro Smart every 6 weeks. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Heat Engineer | ESi Centro Smart |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **78.9% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 306 MB | 45 MB |
| Requires iOS | 16.4 | **8.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) | [ESI Controls Ltd](https://appshunter.io/developer/1151779580) |

## 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 |


### ESi Centro Smart

[App page](https://appshunter.io/ios/app/esi-centro-smart/id1176000335)

Control your plug-in devices remotely using your iPhone or iPad via Wi-Fi. Schedule devices to turn on or off at specific times and monitor their power consumption in real-time or historically. Automatically restart your router when the internet is down.

**Highlights:** Remote device control, Global access via cloud, Customizable schedules, Real-time power monitoring, Historical consumption data, Automatic router reboot

**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 ESi Centro Smart free?

ESi Centro Smart is free to download, with no in-app purchases.

### Do Heat Engineer or ESi Centro Smart have ads?

Neither Heat Engineer nor ESi Centro Smart shows ads.

### Which is updated more often, Heat Engineer or ESi Centro Smart?

Heat Engineer ships an update every 2 months, and ESi Centro Smart every 6 weeks. Most recently, Heat Engineer was updated on October 18, 2026 and ESi Centro Smart 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.*