Xkey Plus vs Intervals and Chords
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Xkey Plus
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.
- Check for new Xkey firmware
- Velocity curves editor
- Configure Xkey sensitivity & timings
- Access all Xkey parameters
- Configure key & button assignments
- Access Xkey documentation & support
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◆◆◆ Xkey Plus ◆◆◆ This app is dedicated to ESI Xkey musical keyboard. It is an ideal companion to your mobile keyboard. FEATURES ◆ Check for new Xkey firmware ◆ Velocity curves editor ◆ In-depth configuration of Xkey sensitivity & timings (advanced users) ◆ Access to all Xkey parameters (advanced users) ◆ Possibility to configure new assignments to all keys & buttons (requires Fw 1.2+) ◆ Direct access to Xkey documentation & support REQUIREMENTS ◆ Xkey musical keyboard ◆ USB cam kit or lightning cable ◆ Compatible with iPad (iOS 7 or later) Do not hesitate to contact us if you find any problem on this app. If you like this app, don't forget to write a positive review ! ESI
Intervals and Chords
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.
- Real-time chord detection
- Key selection for chord adaptation
- Enhanced chord rendering
- Exploration of inversions and voicings
- Instant musical feedback
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Explore harmony wherever you practise. Intervals and Chords identifies possible chords from the notes you are holding and gives you immediate visual feedback on iPhone and iPad. Play the onscreen piano or connect a compatible MIDI controller to explore chords, intervals and musical notation wherever you are. SEE WHAT YOU’RE PLAYING • Identify complete chords and inversions • View note names and the intervals that shape each chord • Compare multiple valid interpretations of the same notes • See notes written on treble and bass staves • Highlight notes belonging to your selected major key LEARN IN CONTEXT Choose from 15 major keys, or use a keyless mode that prefers flats or sharps. Optional Roman-numeral scale degrees help connect each chord to the selected key. Valid chords outside that key are clearly identified without treating them as mistakes. GO DEEPER WHEN YOU’RE READY Advanced interpretation options can identify incomplete and rootless voicings or detect played scales. Beginner-friendly defaults keep complete chords and inversions at the top, so the most useful answers appear first. MADE FOR IPHONE AND IPAD Use the app as a portable music-theory companion at your instrument, in a lesson or while practising away from your desk. The interface adapts to iPhone and iPad, with support for accessible text and VoiceOver. Intervals and Chords analyses the notes currently held. It does not analyse chord progressions or attempt to determine a chord’s musical function within a composition.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Xkey Plus | Intervals and Chords |
|---|---|---|
| Price | Free — better | $5.99 |
| Rating | 2.9 (13 ratings) | 4.8 (10 ratings) — better |
| Positive reviews | 35.7% of reviews | 83.3% of reviews — better |
| Number of ratings | 13 — better | 10 |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 9.3 — better | 15.0 |
| Further details — not scored | ||
| Size | 9 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | ESI Audiotechnik GmbH | Instinctive |
Customer experience
Xkey Plus
Intervals and Chords
In-app purchases
Xkey Plus
No in-app purchases
Intervals and Chords
No in-app purchases
Questions
Is Xkey Plus free?
Is Intervals and Chords free?
Which has better reviews, Xkey Plus or Intervals and Chords?
Do Xkey Plus or Intervals and Chords have ads?
Which is updated more often, Xkey Plus or Intervals and Chords?
Other comparisons
