# Disklavier Controller vs Refrigerant Charge HVAC

The clearest difference is price: Disklavier Controller at Free against Refrigerant Charge HVAC's $0.99. Disklavier Controller also leads on in-app purchases (none vs 1) and ads (none vs shown). Refrigerant Charge HVAC's advantage is update cadence (every 3 weeks vs every 10 months). On device support and iOS requirement there is nothing between them.

Disklavier Controller is free to download; Refrigerant Charge HVAC costs $0.99 up front. Refrigerant Charge HVAC sells 1 one-off in-app purchase. Disklavier Controller asks for nothing beyond the download.

Disklavier Controller ships an update every 10 months, Refrigerant Charge HVAC every 3 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Disklavier Controller | Refrigerant Charge HVAC |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[2.6 (29 ratings)](https://appshunter.io/ios/app/disklavier-controller-us/id467490291/reviews)** | — |
| Number of ratings | **29** | — |
| Positive reviews | 34.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 4 MB | 34 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Yamaha Corporation of America](https://appshunter.io/developer/408058585) | [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) |

## What reviewers say

### Disklavier Controller

[App page](https://appshunter.io/ios/app/disklavier-controller-us/id467490291)

Control key functions of your Disklavier piano remotely via WiFi. Adjust volume, manage playback, select songs, and perform simple recordings from your device. Compatible with specific Disklavier models.

**Highlights:** Main volume control, Start/stop song playback, Source, album, song selection, Simple recording functions, DisklavierRadio playback, Balance, Transpose, Tempo control

**Features:** macOS Compatibility

**In-app purchases:** none


### Refrigerant Charge HVAC

[App page](https://appshunter.io/ios/app/refrigerant-charge-hvac/id6764646716)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


## Frequently asked questions

### Is Disklavier Controller free?

Disklavier Controller is free to download, with no in-app purchases.

### Is Refrigerant Charge HVAC free?

Refrigerant Charge HVAC costs $0.99, and also offers in-app purchases.

### Do Disklavier Controller or Refrigerant Charge HVAC have ads?

Refrigerant Charge HVAC shows ads; Disklavier Controller does not.

### Which is updated more often, Disklavier Controller or Refrigerant Charge HVAC?

Disklavier Controller ships an update every 10 months, and Refrigerant Charge HVAC every 3 weeks. Most recently, Disklavier Controller was updated on November 6, 2026 and Refrigerant Charge HVAC on October 31, 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.*