PolyHarp vs Harmony Bloom
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PolyHarp
This app offers a virtual musical instrument inspired by chorded zithers, featuring extensive chord customization, multi-string capabilities, and massive polyphony. It serves as a platform for harmonic theory exploration and a powerful MIDI controller, with numerous presets and the ability to create unique instruments.
- Extensive chord customization
- Multi-string and polyphony support
- Harmonic theory testbed
- MIDI controller functionality
- Large preset library
- Audiobus 3 and IAA support
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PolyHarp is a virtual musical instrument and a thought experiment. It takes the basic idea of a chorded zither and extends it to large numbers of chord choices, made out of any kinds of intervals, multi-string courses, fretting, and massive polyphony. It's a testbed for harmonic theory as well as a great multi touch simulation of the good old "idiot zither" you have in the attic. PolyHarp can translate many of these innovations to MIDI and is a powerful MIDI controller. PolyHarp comes with a large number of presets, exploring many variants on stringed instruments, but its real power is its ability to build strange new chords, layouts, and controls into otherwise impossible instruments. PolyHarp supports Audiobus 3, including saving setups, and IAA.
Harmony Bloom
This app generates MIDI data with polyrhythmic patterns and accompanying visuals. It offers extensive control over musical sequences, including scale selection and randomization, and allows for audio generation in its standalone version. MIDI capture and export features facilitate integration into digital audio workstations.
- Polyrhythmic MIDI generation
- Visualizer for note patterns
- Standalone audio generation
- Scale Selector with 57 options
- MIDI Capture and Export
- Preset management
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Harmony Bloom (Standalone and AUv3), is a groundbreaking MIDI generator that seamlessly integrates polyrhythmic patterns with stunning visuals. It revolutionizes musical creativity by enabling MIDI data transmission to compatible devices, enhanced by its visual experience. Distinct from typical MIDI generators, Harmony Bloom offers unique functionalities. The standalone version's ability to generate audio, with five selectable sounds, broadens its usability. It features a comprehensive control set for musical creation, including a Scale Selector with 57 options for melodic consistency, and various offset controls for sequence customization. The software's visual component, the Sequencer Visualizer, displays intricate patterns of notes, enhancing the creative process. Key features like MIDI Capture and Export simplify the integration of sequences into digital audio workstations, making Harmony Bloom a valuable tool for music production. Its adaptability is a core strength, with features like 'Use Input Notes' and 'Root Mode' ensuring dynamic musical responses and coherence. 'Global Randomization' allows for exploratory creativity, offering a blend of technical control and artistic freedom. Harmony Bloom emphasizes user experience, providing intuitive preset management. This focus on accessibility and flexibility makes it an ideal choice for musicians, producers, and composers eager to explore new musical dimensions. In essence, Harmony Bloom is not just a MIDI generator but a comprehensive tool for musical exploration and creation. Its combination of polyrhythmic generation, visual feedback, and detailed musical control positions it as a standout instrument for creative and professional applications.
Verdict
The clearest difference is price: PolyHarp at $4.99 against Harmony Bloom's $9.99. PolyHarp also leads on review sentiment (100% vs 78%). On rating, ratings volume, update cadence and ads 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
PolyHarp costs $4.99 and Harmony Bloom $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.9 for PolyHarp against 4.9 for Harmony Bloom. Both are backed by a comparable volume of ratings — 11 and 28 respectively. Written reviews are what separate them: 100% of PolyHarp's written reviews are positive against 78% of Harmony Bloom's.
PolyHarp ships an update every 4 weeks, Harmony Bloom monthly. The most recent releases landed on September 30, 2026 and October 12, 2026 respectively.
| Parameter | PolyHarp | Harmony Bloom |
|---|---|---|
| Price | $4.99 — better | $9.99 |
| Rating | 4.9 (11 ratings) — better | 4.9 (28 ratings) |
| Positive reviews | 100.0% of reviews — better | 78.3% of reviews |
| Number of ratings | 11 | 28 — better |
| Update frequency | Every 4 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPad | iPad |
| Requires iOS | 12.4 | 12.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Henry Lowengard | MNR Development LLC |
Customer experience
PolyHarp
Harmony Bloom
In-app purchases
PolyHarp
No in-app purchases
Harmony Bloom
No in-app purchases


