# VAPolyMk4 vs Hearing Space

The clearest difference is price: Hearing Space at Free against VAPolyMk4's $14.99. Hearing Space also leads on update cadence (every 4 days vs every 2 months). VAPolyMk4's advantage is rating (5.0 vs 4.7). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Hearing Space is free to download; VAPolyMk4 costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

VAPolyMk4 holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively.

VAPolyMk4 ships an update every 2 months, Hearing Space every 4 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | VAPolyMk4 | Hearing Space |
| --- | --- | --- |
| Price | $14.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/vapolymk4/id6753038075/reviews)** | [4.7 (3 ratings)](https://appshunter.io/ios/app/hearing-space-time/id6758031265/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Paid | **Free** |
| Size | 20 MB | 261 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ryo Togawa](https://appshunter.io/developer/1474193056) | [Jing Dong](https://appshunter.io/developer/1563297410) |

## What reviewers say

### VAPolyMk4

[App page](https://appshunter.io/ios/app/vapolymk4/id6753038075)

This app is a powerful bi-timbral polyphonic synthesizer with advanced features like output morphing and a ring modulator. It offers extensive sound design capabilities with multiple oscillators, filters, and envelopes, and can be used standalone or as an AudioUnit Extension.

**Highlights:** Bi-timbral polyphonic synthesis, Output morphing and ring modulator, Multiple oscillators, filters, and envelopes, Standalone and AudioUnit Extension (AUv3) support, Built-in effects and piano roll sequencer, MIDI 2.0 and Ableton Link support, iCloud Drive for project sharing

**Features:** Vision Pro support

**In-app purchases:** none


### Hearing Space

[App page](https://appshunter.io/ios/app/hearing-space-time/id6758031265)

This experimental art application uses AI and machine vision to analyze images, inferring spatial depth and structure. It then transforms these spatial relationships into interactive soundscapes, allowing users to explore a non-human model of space through touch. The app treats your device as a perceptual instrument to reveal AI's internal logic.

**Highlights:** AI-based image analysis, Machine vision for spatial inference, Interactive sound generation, Touch-based sonic exploration, Perceptual instrument interface, Artistic and exploratory experience

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is VAPolyMk4 free?

VAPolyMk4 costs $14.99, with no in-app purchases.

### Is Hearing Space free?

Hearing Space is free to download, with no in-app purchases.

### Which has better reviews, VAPolyMk4 or Hearing Space?

VAPolyMk4 is rated higher. VAPolyMk4 averages 5.0 out of 5 from 2 ratings, while Hearing Space averages 4.7 from 3 ratings.

### Do VAPolyMk4 or Hearing Space have ads?

Neither VAPolyMk4 nor Hearing Space shows ads.

### Which is updated more often, VAPolyMk4 or Hearing Space?

VAPolyMk4 ships an update every 2 months, and Hearing Space every 4 days. Most recently, VAPolyMk4 was updated on October 24, 2026 and Hearing Space on October 24, 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.*