Theremin Touch vs Zeeon synth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Theremin Touch
Experience the unique sound of a classic electronic instrument with this vintage-styled simulator. It offers multiple oscillator wave shapes, adjustable frequency ranges, and built-in effects for a realistic playing experience. Optimized for touch and Apple Pencil on compatible devices.
- Vintage theremin emulation
- Onboard delay and reverb FX
- 4 oscillator wave shapes
- Adjustable frequency range
- Touchpad for frequency and volume control
- Apple Pencil support (iPad only)
- Built-in tuner
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The Theremin is one of the earliest electronic musical instruments, created by Leon Theremin in the late 1920's. Theremin Touch is a vintage styled theremin simulator designed to emulate the sound and spirit of the theremin. This single oscillator, monophonic synthesizer with real world style control features - onboard delay and reverb FX - 4 different oscillator wave shapes - adjustable frequency range for a more stable and playable instrument - 1 to 7 octave range (approx.). 32.703Hz (C1) to 4.186KHz (C8) - touch pad to control frequency and volume - works with Apple Pencil (iPad only) - tuner - customisable look - built with AudioKit With its beautiful vintage audio look, "Theremin Touch" provides the closest experience to playing a theremin on iOS.
Zeeon synth
This app is a virtual analog synthesizer that recreates the sound and feel of classic hardware. It features a detailed circuit-modeling engine, powerful modulation, and multiple filter models for rich, organic soundscapes. Explore a vast array of presets and expand your sonic palette with additional sound banks.
- Circuit-modeling engine
- Powerful modulation matrix
- Dual oscillators with variable waveforms
- Multiple filter models
- Built-in effects unit
- Audio Unit v3 support
- Polyphonic step sequencer
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Zeeon is a virtual-analog synthesizer built on a deeply detailed circuit-modeling engine. We’ve studied classic and modern analog synths to uncover what gives them their unmistakable character and recreated that essence with precision. The result is a unique instrument that delivers the warmth, movement, and organic depth of true hardware. While many emulations sound flat, Zeeon breathes. Every note is alive, with tight lows and shimmering highs. All audio and modulation are processed at 176 kHz (4× oversampling) for uncompromised quality across the entire spectrum. “Desktop-class sound engine … fidelity of this analog emulation goes beyond everything else on iOS.” – App Store review Features • Audio Unit v3 and standalone application with a simple polyphonic step sequencer • Powerful modulation matrix offering self-modulation and cross-layer modulation, 8 modulation slots, 17 signal sources and 41 targets available, both from modulation modules and audio signal path. This takes Zeeon into semi-modular territory. Imagine oscillator waveform, panning, filter cutoff, resonance or LP-HP mode modulated by oscillators or another layer! • 2 oscillators with continuously variable waveforms, hard-sync and sub-oscillator. Carefully simulated analog drift and PSU influence. • Filter: 3 models available: Transistor ladder low pass, OTA cascade low pass and State Variable Filter with continuously variable LP-HP + BP mode. • 2 low frequency oscillators and envelope generators per voice. • Overdrive: diode clipper, transistor saturation, wave folder, pre and post filter. • Up to 2 layers per voice. Layers can modulate each other. • Effects unit: Circuit modelled BBD chorus, bass booster, zero-delay Phaser, Stereo delay and Reverb. • 280 presets and Tutorials bank. 3 additional banks available as IAPs. Full manual and audio demos available at the BeepStreet website.
Screenshots
Verdict
The clearest difference is price: Theremin Touch at $2.99 against Zeeon synth's $14.99. Theremin Touch also leads on in-app purchases (none vs 3) and update cadence (every 2 weeks vs every 2 months). Zeeon synth's advantage is rating (4.8 vs 4.0) and ratings volume (209 vs 15). On ads, device support and iOS requirement 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
Theremin Touch costs $2.99 and Zeeon synth $14.99 up front. Zeeon synth sells 3 one-off in-app purchases. Theremin Touch asks for nothing beyond the download.
Zeeon synth holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Zeeon synth has 209 ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 65% of Theremin Touch's written reviews are positive against 76% of Zeeon synth's.
Theremin Touch ships an update every 2 weeks, Zeeon synth every 2 months. The most recent releases landed on October 10, 2026 and October 20, 2026 respectively.
| Parameter | Theremin Touch | Zeeon synth |
|---|---|---|
| Price | $2.99 — better | $14.99 |
| Rating | 4.0 (15 ratings) | 4.8 (209 ratings) — better |
| Positive reviews | 64.7% of reviews | 76.0% of reviews — better |
| Number of ratings | 15 | 209 — better |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 11 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | John McMillan | BeepStreet |
Customer experience
Theremin Touch
Zeeon synth
Bugs and requests
Theremin Touch
Not enough reviews yet to summarise bugs or requests.
Zeeon synth
Reported bugs
4 issues- Preset settings not retained after app restart
- Synth reverts to default settings when reopening Logic Pro project
- Crashes and freezes on certain iOS 14+ devices
- Inability to access in-app purchases from within the app
Requested features
5 requests- Add MIDI learn functionality
- Implement a more robust preset management system
- Include a built-in sequencer with save/load capabilities
- Improve UI scaling and layout for larger iPad screens
- Provide better integration with inter-app audio and Audiobus
In-app purchases
Theremin Touch
No in-app purchases
Zeeon synth
- OI - Exploration Vol. 1$3.99
- BB Z-Space$4.99
- BB Synthwave$4.99









