VOSIS vs ShadowPlayKA
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!
ShadowPlayKA
This app transforms light and shadow patterns into music as you cycle through outdoor spaces. It uses your smartphone's brightness sensor and a Bluetooth speaker to create a unique auditory experience based on your surroundings.
- Light and shadow as musical score
- Bicycle-mounted smartphone sensor
- Bluetooth speaker integration
- Exploration of urban architecture
- Unique soundscape generation
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ShadowPlay is an exploration of the architecture and light in outdoor spaces through sound. Using a bicycle-mounted smartphone as a brightness sensor and a bluetooth speaker, the mottled patterns of light and shadow become the musical score as one rides along city streets. Supported through the UNESCO City of Media Arts Karlsruhe as well as through the City of Karlsruhe. Scene contributions by Sofy Yuditskaya and Damian Stewart.
Screenshots
Verdict
The clearest difference is rating: ShadowPlayKA at 5.0 against VOSIS's 4.2. VOSIS's advantage is update cadence (every 8 months vs every 25 months) and ratings volume (5 vs 1). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
ShadowPlayKA holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: VOSIS has 5 ratings behind it against 1, so its average is the more settled of the two.
VOSIS ships an update every 8 months, ShadowPlayKA every 25 months. The most recent releases landed on October 6, 2026 and September 29, 2026 respectively.
| Parameter | VOSIS | ShadowPlayKA |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 85.7% of reviews | — |
| Number of ratings | 5 — better | 1 |
| Update frequency | Every 8 months — better | Every 25 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 11 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Life Orange LLC | Daniel Wilcox |
Customer experience
VOSIS
ShadowPlayKA
In-app purchases
VOSIS
No in-app purchases
ShadowPlayKA
No in-app purchases
