# Harmoni Heating vs Guernsey Library

The clearest difference is iOS requirement: Harmoni Heating at 14.0 against Guernsey Library's 16.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 24, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Harmoni Heating | Guernsey Library |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 26.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 80 MB | 199 MB |
| Requires iOS | **14.0** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Home Domotic Developments, S.L.](https://appshunter.io/developer/1481462876) | [Guernsey Library](https://appshunter.io/developer/1792217015) |

## What reviewers say

### Harmoni Heating

[App page](https://appshunter.io/ios/app/harmoni-heating/id1481462803)

Easily manage your smart radiators from anywhere. Group devices by zone, adjust temperatures remotely, and personalize heating schedules for energy savings. Monitor consumption and costs with detailed statistics.

**Highlights:** Remote temperature adjustment, Zone grouping for radiators, Customizable heating schedules, Energy consumption monitoring, Preset heating programs, Screen color customization

**Features:** macOS Compatibility

**In-app purchases:** none


### Guernsey Library

[App page](https://appshunter.io/ios/app/guernsey-library/id6740918402)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Harmoni Heating free?

Harmoni Heating is free to download, with no in-app purchases.

### Is Guernsey Library free?

Guernsey Library is free to download, with no in-app purchases.

### Do Harmoni Heating or Guernsey Library have ads?

Neither Harmoni Heating nor Guernsey Library shows ads.

### Which is updated more often, Harmoni Heating or Guernsey Library?

Harmoni Heating ships an update every 2 months, and Guernsey Library every 2 months. Most recently, Harmoni Heating was updated on September 24, 2026 and Guernsey Library on September 25, 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.*