# E3 Controller vs YDIS Smart

The clearest difference is rating: YDIS Smart at 3.7 against E3 Controller's 2.9. YDIS Smart also leads on update cadence (every 3 months vs every 11 months). E3 Controller's advantage is review sentiment (57% vs 43%). On price, ratings volume, 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.

YDIS Smart holds the better App Store score, 3.7 against 2.9. Both are backed by a comparable volume of ratings — 9 and 16 respectively. Written reviews complicate that: 57% of E3 Controller's written reviews are positive against 43% of YDIS Smart's, so the app with the better star average is not the one people write more warmly about.

E3 Controller ships an update every 11 months, YDIS Smart every 3 months. The most recent releases landed on September 21, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | E3 Controller | YDIS Smart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.9 (9 ratings)](https://appshunter.io/ios/app/e3-controller-us/id509030474/reviews) | **[3.7 (16 ratings)](https://appshunter.io/ios/app/ydis-smart/id1062728896/reviews)** |
| Number of ratings | 9 | **16** |
| Positive reviews | **57.1% of reviews** | 42.9% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 12 MB | 7 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Yamaha Corporation of America](https://appshunter.io/developer/408058585) | [Yamaha Motor Co., Ltd.](https://appshunter.io/developer/337268490) |

## What reviewers say

### E3 Controller

[App page](https://appshunter.io/ios/app/e3-controller-us/id509030474)

Control your Disklavier E3 or DKC-850 remotely from your iOS device. View song titles and access all functions previously available with the infrared remote. Requires a wireless router connection to your piano.

**Highlights:** Remote control for Disklavier E3/DKC-850, Access all infrared remote functions, View piano control unit screen, Check song titles remotely, Wireless router connectivity

**Features:** macOS Compatibility

**In-app purchases:** none


### YDIS Smart

[App page](https://appshunter.io/ios/app/ydis-smart/id1062728896)

This application allows authorized Yamaha dealers to access diagnostic functions for Yamaha outboard motors on their smartphones. It requires a dedicated adapter and registration information for the PC version of the diagnostic system.

**Highlights:** Perform inspections of Yamaha outboard motors, Access self-diagnostic system functions, Use on smartphones, Requires dedicated adapter, Requires YDIS PC version registration, Enable speedometer display with GPS

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is E3 Controller free?

E3 Controller is free to download, with no in-app purchases.

### Is YDIS Smart free?

YDIS Smart is free to download, with no in-app purchases.

### Which has better reviews, E3 Controller or YDIS Smart?

YDIS Smart is rated higher. E3 Controller averages 2.9 out of 5 from 9 ratings, while YDIS Smart averages 3.7 from 16 ratings.

### Do E3 Controller or YDIS Smart have ads?

Neither E3 Controller nor YDIS Smart shows ads.

### Which is updated more often, E3 Controller or YDIS Smart?

E3 Controller ships an update every 11 months, and YDIS Smart every 3 months. Most recently, E3 Controller was updated on September 21, 2026 and YDIS Smart on September 16, 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.*