# Heat Engineer vs Assess+

The clearest difference is review sentiment: Heat Engineer at 79% against Assess+'s 14%. Assess+'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. Assess+ 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 17, 2026 respectively.

## The numbers

| Metric | Heat Engineer | Assess+ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **78.9% of reviews** | 14.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | Free |
| Size | 44 MB | 140 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Heat Engineer Software Ltd](https://appshunter.io/developer/1461678894) | [CoreLogic U.K. Limited](https://appshunter.io/developer/1346556721) |

## 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 |


### Assess+

[App page](https://appshunter.io/ios/app/assess-plus/id1498184499)

This app streamlines on-site data collection for property assessment professionals. It integrates with PAS Hub and Assessor Hub platforms to support various assessment types, generating compliance documentation.

**Highlights:** PAS Hub integration, Assessor Hub integration, Retrofit Assessment support, EPC completion, Legionella Report generation, On-site data collection

**Features:** 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 Assess+ free?

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

### Do Heat Engineer or Assess+ have ads?

Neither Heat Engineer nor Assess+ shows ads.

### Which is updated more often, Heat Engineer or Assess+?

Heat Engineer ships an update every 2 months, and Assess+ every 2 months. Most recently, Heat Engineer was updated on August 5, 2026 and Assess+ on August 17, 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.*