VOSIS vs Gestrument Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VOSIS
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.
- Image sonification
- Visual music composition
- Experimental sound design
- Pixel luminance audification
- Shape-timbre relationships
- Adjustable pitch and timbre
- ADSR envelope control
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VOSIS is a synthesizer combining audification of greyscale pixel data with several image filters. It is a tool for image sonification, visual music composition, and experimental sound design. The audification of pixel luminance values creates shape-timbre relationships. Pixel scan rate is controlled in terms of note interval, octave, and scale to give varying pitch between image regions. The ADSR envelope allows one to play images as a non-linear sequence of pitches with varying wavetable/timbre. For more features including presets and unlimited recording see VOSIS Pro. Visit vosis.app for sound example, demo videos, and user guide!
Gestrument Pro
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.
- 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
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The Interactive Gesture Instrument Create music based on complex systems of musical rules and interactions. Using the motion of your fingertips, Gestrument Pro lets you play, improvise and compose with deeper levels of personal expression than ever before. Play your music your way Gestrument Pro lets you create something in-between a bespoke instrument and written piece of music. In other words, it’s an instrument made to play your own music in your own way. Widen your musical comfort zone Experiment with simple and advanced musical concepts such as microtonality, polyrhythms and much more using our modular system of highly tweakable musical generators. A next level Improvisational tool By building patches based on the musical rules and properties of your own music, Gestrument Pro lets you improvise to it in real-time. Our Pitch and Rhythm generators make sure you’re always on time and always on pitch, no matter how you play. Powered by the Gestrument Engine Gestrument Pro is completely powered by our revolutionary Gestrument Engine, a system for generating music based on user interactions in real-time. Based on the revolutionary Gestrument app from 2012, award-winning composer Jesper Nordin and leading iOS developer Jonatan Liljedahl (Kymatica) have completely re-invented their unique instrument and taken the concept to the next level. Gestrument PRO takes everything we loved about the original Gestrument app and improves on its unique functionality while introducing a host of new features such as multi-touch, recordable automations, advanced scale editing and a unique system of highly tweakable modular generators that define rhythms and pitches. Features: • Powered by the Gestrument Engine. • Up to 16 individual Instruments. • Each Instrument can be controlled by any of up to 8 Cursors. • Instruments can use internal high quality sounds or play other synthesizers or apps via MIDI. • Modular swappable Generators for producing the rhythms and pitches per Instrument, each with their own set of tweakable parameters and settings. • 8 performance sliders that each can control one or more parameters in the Instruments and their Generators. • A highly flexible modulation system allows assigning Sliders and Cursor position/pressure to any parameter in the Instruments. • Advanced microtonal Scale editor with several standard scales included. • 8 Scale Slots for fast switching between scales and tonalities during performance. • Sliders, Cursors and Scale Slots can be recorded into automated loops, or controlled via MIDI. They can also send MIDI. • Supports Inter-App Audio and Audiobus, including host sync for following the hosts transport and tempo. Terms of Use: http://www.apple.com/legal/itunes/appstore/dev/stdeula
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | VOSIS | Gestrument Pro |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) — better | 3.8 (66 ratings) |
| Positive reviews | 85.7% of reviews — better | 57.4% of reviews |
| Number of ratings | 5 | 66 — better |
| Update frequency | Every 8 months | Every 7 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 11.2 — better |
| Further details — not scored | ||
| Size | 11 MB | 338 MB |
| Age rating | 4+ | 4+ |
| Developer | Life Orange LLC | Gestrument AB |
Customer experience
VOSIS
Gestrument Pro
Bugs and requests
VOSIS
Not enough reviews yet to summarise bugs or requests.
Gestrument Pro
Reported bugs
7 issues- 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
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- Pops mentioned by another reviewer
- All instruments play the same note suddenly
Requested features
11 requests- Preset folders
- Additional features
- Improved AUv3 support
- More training videos
- Ability to display note length/rates divisions at the top of the screen
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- Control more than one synth at a time (separate channels)
- Hold function for holding down the loop
- Ableton Link integration
- Inbuilt facility to record music
- Ability to record or share music
- Redo the user interface for instruments
In-app purchases
VOSIS
No in-app purchases
Gestrument Pro
- Monthly subscription7 Days trial$1.491 Month
- One-time purchase$14.99








