# VOSIS vs Composia

The clearest difference is review sentiment: VOSIS at 86% against Composia's 0%. VOSIS also leads on in-app purchases (none vs 1) and iOS requirement (13.0 vs 15.0). Composia's advantage is update cadence (every 4 weeks vs every 8 months) and rating (4.5 vs 4.2). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Composia sells 1 one-off in-app purchase. VOSIS asks for nothing beyond the download.

Composia holds the better App Store score, 4.5 against 4.2. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews complicate that: 86% of VOSIS's written reviews are positive against 0% of Composia'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, Composia every 4 weeks. The most recent releases landed on November 1, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | VOSIS | Composia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/vosis/id783342051/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/composia/id1489779313/reviews)** |
| Number of ratings | **5** | 2 |
| Positive reviews | **85.7% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 11 MB | 14 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Life Orange LLC](https://appshunter.io/developer/783342054) | [PDJ Apps](https://appshunter.io/developer/290231771) |

## 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


### Composia

[App page](https://appshunter.io/ios/app/composia/id1489779313)

Create and practice music theory with this app. It offers tools for composing, generating sheet music, and exporting your work to MIDI or PDF. Learn concepts like keys, scales, chords, and part writing.

**Highlights:** Music theory concepts (Keys, Scales, Chords), Composition creation, Sheet music generation, MIDI and PDF export, Real-time pinch zoom for sheet music, Part writing tool

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $4.99 | one-time |


## Frequently asked questions

### Is VOSIS free?

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

### Is Composia free?

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

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

Composia is rated higher. VOSIS averages 4.2 out of 5 from 5 ratings, while Composia averages 4.5 from 2 ratings.

### Do VOSIS or Composia have ads?

Neither VOSIS nor Composia shows ads.

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

VOSIS ships an update every 8 months, and Composia every 4 weeks. Most recently, VOSIS was updated on November 1, 2026 and Composia on October 27, 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.*