Air Melody vs Theremin I/O
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Air Melody
This app allows users to create music using their device's motion and on-screen controls. Explore various tones and effects to craft unique melodies. It offers intuitive pitch and dynamics manipulation for a creative musical experience.
- Motion-based pitch and dynamics control
- Multiple instrument tones
- Adjustable echo effects
- Pitch correction options
- On-screen wheel for octave control
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Dynamics control: - Tilt your iPhone to forward 45deg: ff Pitch control: - Rotate your iPhone to clockwise or counterclockwise 1oct per half rotation(counterclockwise 90deg, clockwise 90deg). Range: 1oct - Rotate big wheel in the screen 1oct per half rotation. Range: 8oct Tone: t: Theremin o: Ondes Martenot s: Strings h: Harmony v: Vox c: Synth Cat Effect: 0: no effect s: Short Echo l: Long Echo vl: Very Long Echo Correct (Pitch correction): 0: no correction s: soft m: middle h: hard
Theremin I/O
Transform your iPhone into a touchless musical instrument using your camera and flash. Control sound generation by hand proximity, with options for scales, sound presets, and effects. An in-app purchase enables MIDI controller functionality.
- Touchless instrument control via camera
- Adjustable scales and harmony quantization
- Multiple sound presets with effects
- MIDI controller functionality (in-app purchase)
- Interactive tutorial overlay
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Play with light – Theremin I/O turns your iPhone into a touchless music instrument. It uses your camera and flash to measure the distance to your hand, this signal is then processed by a synthesizer to generate a tone. Features: • Old-school synthesizer • Constrain input to scales (harmony quantization) • 8 sound presets with effect controls • 50+ scale presets • Use as a MIDI controller (requires in-app purchase) • Learn fast with the tutorial overlay For more information visit http://theremin.io
Screenshots
Verdict
The clearest difference is rating: Theremin I/O at 4.0 against Air Melody's 1.0. Theremin I/O also leads on review sentiment (77% vs 60%) and ratings volume (5 vs 1). Air Melody's advantage is in-app purchases (none vs 1) and update cadence (every 3 months vs every 24 months). On ads, monetization model 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
Air Melody costs $1.99 and Theremin I/O $2.99 up front. Theremin I/O sells 1 one-off in-app purchase. Air Melody asks for nothing beyond the download.
Theremin I/O holds the better App Store score, 4.0 against 1.0. That said, the two scores are not equally well evidenced: Theremin I/O has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 60% of Air Melody's written reviews are positive against 77% of Theremin I/O's.
Air Melody ships an update every 3 months, Theremin I/O every 24 months. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.
| Parameter | Air Melody | Theremin I/O |
|---|---|---|
| Price | $1.99 — better | $2.99 |
| Rating | 1.0 (1 ratings) | 4.0 (5 ratings) — better |
| Positive reviews | 60.0% of reviews | 76.9% of reviews — better |
| Number of ratings | 1 | 5 — better |
| Update frequency | Every 3 months — better | Every 24 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 18 MB |
| Age rating | +4 | +4 |
| Developer | Masao Suzaki | FFFF00 Agents AB |
Customer experience
Air Melody
Theremin I/O
In-app purchases
Air Melody
No in-app purchases
Theremin I/O
- Network MIDI$5.99
