# Heat Engineer vs Spruce Energy

The clearest difference is in-app purchases: Spruce Energy at none against Heat Engineer's 1. Spruce Energy also leads on update cadence (monthly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Heat Engineer ships an update every 2 months, Spruce Energy monthly. The most recent releases landed on August 5, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Heat Engineer | Spruce Energy |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 78.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Size | 44 MB | 5 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) | [Spruce Energy Limited](https://appshunter.io/developer/1756576941) |

## 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 |


### Spruce Energy

[App page](https://appshunter.io/ios/app/spruce-energy/id6530588740)

**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 Spruce Energy free?

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

### Do Heat Engineer or Spruce Energy have ads?

Neither Heat Engineer nor Spruce Energy shows ads.

### Which is updated more often, Heat Engineer or Spruce Energy?

Heat Engineer ships an update every 2 months, and Spruce Energy monthly. Most recently, Heat Engineer was updated on August 5, 2026 and Spruce Energy on September 15, 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.*