# Xkey Plus vs Intervals and Chords

The clearest difference is review sentiment: Intervals and Chords at 83% against Xkey Plus's 36%. Intervals and Chords also leads on rating (4.8 vs 2.9) and device support (3 vs 1). Xkey Plus's advantage is price (Free vs $5.99) and iOS requirement (9.3 vs 15.0). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Xkey Plus is free to download; Intervals and Chords costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Intervals and Chords holds the better App Store score, 4.8 against 2.9. Both are backed by a comparable volume of ratings — 13 and 10 respectively. Written reviews point the same way: 36% of Xkey Plus's written reviews are positive against 83% of Intervals and Chords's.

Xkey Plus ships an update every 3 months, Intervals and Chords every 2 months. The most recent releases landed on October 10, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Xkey Plus | Intervals and Chords |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | [2.9 (13 ratings)](https://appshunter.io/ios/app/xkey-plus/id698087460/reviews) | **[4.8 (10 ratings)](https://appshunter.io/ios/app/intervals-and-chords/id6447244430/reviews)** |
| Number of ratings | **13** | 10 |
| Positive reviews | 35.7% of reviews | **83.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 9 MB | 17 MB |
| Requires iOS | **9.3** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ESI Audiotechnik GmbH](https://appshunter.io/developer/1627424644) | [Instinctive](https://appshunter.io/developer/553439405) |

## What reviewers say

### Xkey Plus

[App page](https://appshunter.io/ios/app/xkey-plus/id698087460)

This app enhances the functionality of ESI Xkey musical keyboards on mobile devices. It allows users to update firmware, customize velocity curves, and configure key sensitivity and timings for an advanced user experience.

**Highlights:** Check for new Xkey firmware, Velocity curves editor, Configure Xkey sensitivity & timings, Access all Xkey parameters, Configure key & button assignments, Access Xkey documentation & support

**Features:** macOS Compatibility

**In-app purchases:** none


### Intervals and Chords

[App page](https://appshunter.io/ios/app/intervals-and-chords/id6447244430)

This music theory app helps musicians of all levels visualize and understand chords. It features real-time chord detection, key selection, and enhanced visualization for deeper harmonic exploration.

**Highlights:** Real-time chord detection, Key selection for chord adaptation, Enhanced chord rendering, Exploration of inversions and voicings, Instant musical feedback

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

**In-app purchases:** none


## Frequently asked questions

### Is Xkey Plus free?

Xkey Plus is free to download, with no in-app purchases.

### Is Intervals and Chords free?

Intervals and Chords costs $5.99, with no in-app purchases.

### Which has better reviews, Xkey Plus or Intervals and Chords?

Intervals and Chords is rated higher. Xkey Plus averages 2.9 out of 5 from 13 ratings, while Intervals and Chords averages 4.8 from 10 ratings.

### Do Xkey Plus or Intervals and Chords have ads?

Neither Xkey Plus nor Intervals and Chords shows ads.

### Which is updated more often, Xkey Plus or Intervals and Chords?

Xkey Plus ships an update every 3 months, and Intervals and Chords every 2 months. Most recently, Xkey Plus was updated on October 10, 2026 and Intervals and Chords on October 8, 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.*