# VOSIS vs Holon

The clearest difference is in-app purchases: VOSIS at none against Holon's 2. VOSIS also leads on review sentiment (86% vs 75%). Holon's advantage is rating (4.5 vs 4.2) and update cadence (every 3 months vs every 8 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Holon sells 2 one-off in-app purchases. VOSIS asks for nothing beyond the download.

Holon holds the better App Store score, 4.5 against 4.2. Both are backed by a comparable volume of ratings — 5 and 14 respectively. Written reviews complicate that: 86% of VOSIS's written reviews are positive against 75% of Holon's, so the app with the better star average is not the one people write more warmly about.

VOSIS ships an update every 8 months, Holon every 3 months. The most recent releases landed on October 26, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | VOSIS | Holon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/vosis/id783342051/reviews) | **[4.5 (14 ratings)](https://appshunter.io/ios/app/holon/id1352687747/reviews)** |
| Number of ratings | 5 | **14** |
| Positive reviews | **85.7% of reviews** | 75.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 months** |
| Monetization | **Free** | Paid |
| Size | 11 MB | 144 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Life Orange LLC](https://appshunter.io/developer/783342054) | [Holonic Systems Oy](https://appshunter.io/developer/1172474856) |

## What reviewers say

### VOSIS

[App page](https://appshunter.io/ios/app/vosis/id783342051)

This app transforms image data into sound, allowing for unique musical compositions and experimental sound design. It offers control over pitch, timbre, and envelopes to create shape-timbre relationships from visual input.

**Highlights:** Image sonification, Visual music composition, Experimental sound design, Pixel luminance audification, Shape-timbre relationships, Adjustable pitch and timbre, ADSR envelope control

**In-app purchases:** none


### Holon

[App page](https://appshunter.io/ios/app/holon/id1352687747)

This app transforms your movement through cities into a dynamic, real-time musical score. It uses your physical location and activity to generate interactive synth music, encouraging outdoor exploration and turning listeners into performers.

**Highlights:** Human-powered music generation, Encourages outdoor activity, Zero UI for minimal distraction, Environmentally responsive music, Real-time synth music creation, Optional AirPods and Apple Watch integration

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Apple Watch support | Free | one-time |
| Movesense Support | Free | one-time |


## Frequently asked questions

### Is VOSIS free?

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

### Is Holon free?

Holon is free to download, with in-app purchases available.

### Which has better reviews, VOSIS or Holon?

Holon is rated higher. VOSIS averages 4.2 out of 5 from 5 ratings, while Holon averages 4.5 from 14 ratings.

### Do VOSIS or Holon have ads?

Neither VOSIS nor Holon shows ads.

### Which is updated more often, VOSIS or Holon?

VOSIS ships an update every 8 months, and Holon every 3 months. Most recently, VOSIS was updated on October 26, 2026 and Holon on October 19, 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.*