VOSIS vs TC
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!
TC
Experience unique sound synthesis through intuitive multi-touch gestures. This app offers a button-free performance environment where your touch movements generate all sounds. Discover diverse sonic landscapes and control instruments with taps, pulls, and stretches.
- Multi-touch performance environment
- Gesture-based sound generation
- No buttons, keys, or sliders
- Downloadable patch packs
- Transposition for key changes
- Audiobus compatibility
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Explore unreal synthesis with the most unique performance control on iOS! TC-Performer presents a multi-touch performance environment unlike any other synthesizer. Simply touch the screen; there are no buttons, keys, or sliders to hit. The sounds are generated entirely by your touch movements. Each patch has a unique method of control. Pull, tap, drag, twist, and stretch your touches on the screen. There is no wrong way to play! Every instrument is a new landscape of sound creation. Pads, leads, effects, and indescribable oddities await. You can download more patches in packs inside the app. There is also a transposition section available to change the key of the patch to fit your song, and Audiobus compatibility to record via inter-app audio. Start exploring touch synthesis with TC-Performer!
Screenshots
Verdict
The clearest difference is in-app purchases: VOSIS at none against TC's 7. TC's advantage is rating (4.6 vs 4.2) and update cadence (every 5 weeks vs every 8 months). On price, review sentiment, 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. TC sells 7 one-off in-app purchases. VOSIS asks for nothing beyond the download.
TC holds the better App Store score, 4.6 against 4.2. That said, the two scores are not equally well evidenced: TC has 42 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 86% of VOSIS's written reviews are positive against 78% of TC'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, TC every 5 weeks. Both last shipped on November 1, 2026.
| Parameter | VOSIS | TC |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) | 4.6 (42 ratings) — better |
| Positive reviews | 85.7% of reviews — better | 78.0% of reviews |
| Number of ratings | 5 | 42 — better |
| Update frequency | Every 8 months | Every 5 weeks — 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 | 10.0 — better |
| Further details — not scored | ||
| Size | 11 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | Life Orange LLC | Bit Shape |
Customer experience
VOSIS
TC
In-app purchases
VOSIS
No in-app purchases
TC
- Expansion Pack 1$0.99
- Expansion Pack 2$0.99
- Pad Pack 1$0.99
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- Transposition$1.99
- Core Pack$3.99
- All Packs + Transposition$6.99
- All Packs + Transposition$7.99








