# Heat Engineer vs TradeOS Engineer

The clearest difference is in-app purchases: TradeOS Engineer at none against Heat Engineer's 1. TradeOS Engineer also leads on update cadence (fortnightly 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. TradeOS Engineer asks for nothing beyond the download.

Heat Engineer ships an update every 2 months, TradeOS Engineer fortnightly. The most recent releases landed on October 2, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Heat Engineer | TradeOS Engineer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 78.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 203 MB | 45 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) | [daniel betts](https://appshunter.io/developer/1896339577) |

## 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 |


### TradeOS Engineer

[App page](https://appshunter.io/ios/app/tradeos-engineer/id6771853044)

**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 TradeOS Engineer free?

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

### Do Heat Engineer or TradeOS Engineer have ads?

Neither Heat Engineer nor TradeOS Engineer shows ads.

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

Heat Engineer ships an update every 2 months, and TradeOS Engineer fortnightly. Most recently, Heat Engineer was updated on October 2, 2026 and TradeOS Engineer on October 7, 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.*