# VOSIS vs Gestrument Pro

The clearest difference is in-app purchases: VOSIS at none against Gestrument Pro's 2. VOSIS also leads on review sentiment (86% vs 57%) and rating (4.2 vs 3.8). Gestrument Pro's advantage is ratings volume (66 vs 5) and iOS requirement (11.2 vs 13.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Gestrument Pro sells 2 in-app purchases, starting at $1.49 per month. VOSIS asks for nothing beyond the download.

VOSIS holds the better App Store score, 4.2 against 3.8. That said, the two scores are not equally well evidenced: Gestrument Pro has 66 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 86% of VOSIS's written reviews are positive against 57% of Gestrument Pro's.

VOSIS ships an update every 8 months, Gestrument Pro every 7 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | VOSIS | Gestrument Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/vosis/id783342051/reviews)** | [3.8 (66 ratings)](https://appshunter.io/ios/app/gestrument-pro/id1105890031/reviews) |
| Number of ratings | 5 | **66** |
| Positive reviews | **85.7% of reviews** | 57.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 7 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 11 MB | 338 MB |
| Requires iOS | 13.0 | **11.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Life Orange LLC](https://appshunter.io/developer/783342054) | [Gestrument AB](https://appshunter.io/developer/576235485) |

## 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


### Gestrument Pro

[App page](https://appshunter.io/ios/app/gestrument-pro/id1105890031)

Create music with complex systems and fingertip motion. This interactive instrument allows for deep personal expression in playing, improvising, and composing. Experiment with advanced musical concepts and real-time improvisation.

**Highlights:** Interactive gesture-based music creation, Real-time improvisation and composition, Modular musical generators, Advanced microtonal scale editor, MIDI output and Inter-App Audio/Audiobus support, Recordable automations

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $1.49 | per month |
| One-time purchase | $14.99 | one-time |

**What reviewers like**

- 💡 Innovative music creation
- 👍 Easy to use interface
- 🚀 Powerful music making capabilities
- 🎶 Great for live performance
- ✨ Unique musical expression

**What reviewers complain about**

- 🤔 User interface dated
- ⚠️ Incomplete interface
- 📉 Fear of no further support
- 🚫 No AUV3 support
- 💸 Expensive for unknown concept

**Reported bugs**

- GestrumentPro not working in AUM as IAA
- Interface not fixed when selecting CC or CHANNEL
- App crashes when hitting MIDI controls in settings
- Audio pops with multiple instruments and reverb
- User Manual getting stuck open

**Requested features**

- Preset folders
- Additional features
- Improved AUv3 support
- More training videos
- Ability to display note length/rates divisions at the top of the screen


## Frequently asked questions

### Is VOSIS free?

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

### Is Gestrument Pro free?

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

### Which has better reviews, VOSIS or Gestrument Pro?

VOSIS is rated higher. VOSIS averages 4.2 out of 5 from 5 ratings, while Gestrument Pro averages 3.8 from 66 ratings.

### Do VOSIS or Gestrument Pro have ads?

Neither VOSIS nor Gestrument Pro shows ads.

### Which is updated more often, VOSIS or Gestrument Pro?

VOSIS ships an update every 8 months, and Gestrument Pro every 7 months. Most recently, VOSIS was updated on November 1, 2026 and Gestrument Pro on November 2, 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.*