Haptic Metronome vs Rainbow Keys
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Haptic Metronome
This app provides a visual and haptic metronome for musicians. It offers customizable beat groupings with accents and allows for tempo control via tap tempo. Audio can be optionally disabled for a silent practice experience.
- Visual beat pulses
- Haptic feedback patterns
- Optional audio metronome
- Customizable time signatures
- Tap Tempo feature
- Beat grouping with accents
- Spotlight search integration
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Haptic Metronome is a visual/haptic first digital metronome. It pulses beats with both a visual reference and a haptic feedback pattern. You can optionally switch on/off the audio. It offers a very convenient and straightforward setup for your time signature, tempo (both by selecting a specific tempo, or using the Tap Tempo feature). It is very easy to setup groupings of beats by enabling an *accent* per each beat so that it pulses stronger and creates the perfect pattern you need for your music. It is currently available for iOS and iPadOS. *I'm currently working on bringing the experience on watchOS and macOS* Haptic Metronome supports Spotlight research, it exposes few presets to start a metronome with home screen quick actions. It also supports handoff between the two platforms so that you can continue a session on the other device with the same settings you had set on the previous one. Enjoy your playing! And, please send me any kind of feedback at [Luca Strazzullo](mailto:lucastrazzullo86@gmail.com)
Rainbow Keys
Learn piano scales and chords with augmented reality. This app overlays key names onto your keyboard, aiding real-time learning for improvisation and music theory.
- Augmented reality key display
- Object recognition for keyboards
- Selectable scales and chords
- Real-time learning
- Music theory education
- Improvisation aid
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Rainbow keys is an interactive augmented reality app that uses object recognition to display the names of the keys onto your piano or keyboard. You can select from a large range of scales and chords to display, allowing you to learn in real time. It's great for improvisation, developing your skills in piano and learning music theory.
Screenshots
Verdict
The clearest difference is price: Rainbow Keys at Free against Haptic Metronome's $0.99. Rainbow Keys also leads on update cadence (every 4 days vs every 7 months). Haptic Metronome's advantage is device support (4 vs 2) and iOS requirement (13.0 vs 17). On review sentiment, 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
Rainbow Keys is free to download; Haptic Metronome costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Haptic Metronome ships an update every 7 months, Rainbow Keys every 4 days. The most recent releases landed on November 11, 2026 and November 4, 2026 respectively.
| Parameter | Haptic Metronome | Rainbow Keys |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.8 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 4 — better | — |
| Update frequency | Every 7 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17 |
| Further details — not scored | ||
| Size | 3 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | Luca Strazzullo | Matthew Sefton |
Customer experience
Haptic Metronome
Rainbow Keys
In-app purchases
Haptic Metronome
No in-app purchases
Rainbow Keys
No in-app purchases
