Harmonizr vs Solo Harmony
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Harmonizr
This app allows users to create vocal harmonies by singing along to a melody. It synthesizes up to three harmony voices in the user's own voice and can be controlled via MIDI input or used as an extension in other music production apps.
- Automatic vocal harmony synthesis
- Real-time key center selection
- MIDI keyboard integration
- On-screen MIDI keyboard
- Audio Unit (AUV3) extension support
- Control via MIDI controller apps
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Harmonizr is a vocal harmonizer offering a unique and fun user interface. Plug in a pair of headphones and sing a melody, tapping the correct key center buttons, and Harmonizr will follow, synthesizing up to three voices of automatic harmony in your own voice. Plug in a MIDI keyboard, or use the on-screen one, and you can sing harmony like Imogen Heap or Jacob Collier, matching every note you play. Harmonizr also can also be used as an Audio Unit (AUV3) extension within other apps, such as GarageBand, AUM, or Cubasis, and can be controlled by MIDI controller apps like SoundPrism.
Solo Harmony
This app synthesizes harmony parts with your solo singing in real-time. Mix up to five harmony parts using an ad-lib keyboard and adjust pitch for chorus effects. Record and playback synthesized sounds, or use it for karaoke practice.
- Ad-lib Harmony Mix engine
- Real-time multi-part mixing
- Subtle pitch shift for chorus effect
- Recording and playback
- Input from microphone, files, and other apps
- Karaoke practice mode
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Automatically harmonizes with your solo singing. ◆ Equipped with an [Ad-lib Harmony Mix] engine, allowing you to synthesize harmony parts with ad-lib performances while singing. ◆ Use the ad-lib keyboard to mix up to 5 parts simultaneously in real-time. ◆ The subtle pitch shift setting allows you to produce a chorus effect. ◆ Supports recording and playback of synthesized sounds. ◆ Supports not only microphone input, but also recording files and shared files from other apps. ◆ You can mix harmony parts while playing audio files. ◆ Useful for practicing karaoke harmony by playing the original vocals quietly and the harmony parts loudly. ◆ Recorded files can be sent to AirDrop, SNS, etc. as shared files. ● Notes: ・To prevent howling, the app automatically disables the microphone input signal while playing audio files. ・When using Bluetooth earphones, it may not be possible to monitor the sound being recorded.
Screenshots
Verdict
The clearest difference is review sentiment: Harmonizr at 74% against Solo Harmony's 20%. Harmonizr also leads on rating (4.2 vs 4.0) and ratings volume (27 vs 3). Solo Harmony's advantage is price ($0.99 vs $4.99) and iOS requirement (13.0 vs 18.6). On update cadence, ads, in-app purchases and monetization model 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
Harmonizr costs $4.99 and Solo Harmony $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Harmonizr holds the better App Store score, 4.2 against 4.0. That said, the two scores are not equally well evidenced: Harmonizr has 27 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 74% of Harmonizr's written reviews are positive against 20% of Solo Harmony's.
Harmonizr ships an update every 4 months, Solo Harmony every 7 months. The most recent releases landed on October 19, 2026 and October 16, 2026 respectively.
| Parameter | Harmonizr | Solo Harmony |
|---|---|---|
| Price | $4.99 | $0.99 — better |
| Rating | 4.2 (27 ratings) — better | 4.0 (3 ratings) |
| Positive reviews | 73.9% of reviews — better | 20.0% of reviews |
| Number of ratings | 27 — better | 3 |
| Update frequency | Every 4 months — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthew Robbins | Masanori Katsuta |
Customer experience
Harmonizr
Solo Harmony
In-app purchases
Harmonizr
No in-app purchases
Solo Harmony
No in-app purchases
