Jam Synth vs SpaceTheremin
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Jam Synth
Transform your guitar into a synthesizer with this app. It accurately tracks pitch and amplitude to control digital oscillators, offering unique synth leads and effects. Go beyond MIDI with expressive, organic sounds and advanced modulation options.
- Monophonic guitar synthesizer
- Pitch and amplitude tracking
- Multiple oscillator wave shapes
- Dynamic filter tracking
- Advanced FX section (LFO, Delay, Harmonizer, etc.)
- MIDI output for external synths
- High-accuracy pitch tuner
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Jam Synth is a fully featured monophonic guitar synthesizer / multi FX for iOS. It tracks the pitch and amplitude of an incoming guitar signal and uses this information to control digital oscillators, adding a unique guitar infused edge to your synth leads. Unlike typical pitch to MIDI converters, Jam Synth forgoes MIDI altogether when producing sounds internally because it is impossible to shoehorn the expressive pitch and dynamics of a stringed instrument into the MIDI standard. Jam Synth can accurately track string bends and vibrato with the extreme accuracy of a strobe tuner (1/10 of 1 cent) to produce much more organic synth sounds than other guitar to MIDI converters, including its own MIDI output (though its MIDI output still creates quite a unique guitar / synth hybrid sound because of its pitch bend abilities). It also features some of the most esoteric and unique FX you can get for your guitar. Features: • 3 Phase Distortion Oscillators (4 on iPad) with 8 different wave shapes: Saw, Square, Pulse, Double Sine, Saw-Pulse, Resonant 1, Resonant 2, and Resonant 3 • Filter can be set to track picking dynamics • Input section with Gate, Compressor, ADSR, and Input Filter • FX section - A fully featured LFO with 5 wave shapes and an invert switch for a wide range of pulsating effects - Stereo Delay with a stereo width control for ping pong effects and a filter for emulating analog delay - 3D Chorus, a classic "motionless" chorus that adds a stereo DIMENSION to the synth - Intelligent Harmonizer: This creates musically correct harmonies based on the key you are playing in. The harmonies can be altered by choosing a specific interval and one of the seven musical modes: Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, and Locrian. It works on MIDI output using multi-channel pitch bending for synths that support such fancy things. It also works on your dry guitar output using high quality formant corrected pitch shift. It is just the best. - Rotary Vibe: This recreates the swirling psychedelic sounds of the 1960's by combining a thick 12-stage stereo phaser with a 3D rotary panning effect. Create anything from a slow stereo swirl to a futuristic synth organ with this. - Rainbows: Adds analog modeled auto rainbows to your sound. Adds extra rainbows when used with the harmonizer. - Time Stopper: Freezes time... • LFO / Stereo Delay / Rotary Vibe can be synced to tap tempo or incoming MIDI clock sync / Inter App Audio sync • Highly accurate pitch tracking and tuner, accurate to 1/10th of a cent • MIDI OUT and guitar to MIDI conversion for controlling other MIDI synths with your guitar through Core MIDI accessories and Virtual MIDI • string bends and vibrato are converted to MIDI pitch wheel data • picking dynamics are converted to MIDI volume expression data • compatible with guitar and audio interfaces made for iPhone and iPad • detailed user manual • Fat Bass • Super Chip Leads • Beagle Time • Little Cesars Jam Synth is designed to be easy to use even for users who don't have a lot of experience programming or playing synthesizers. When in doubt, just press buttons and turn knobs while plucking a string until you find a sound you like! J a m S y n t h 2 coming soon ---------------- http://www.facebook.com/PrimitiveDigitalSoftware
SpaceTheremin
Create unique soundscapes by touching and moving your screen to control pitch and cosmic delay effects. Explore various wave shapes and warp options to craft your sonic experience. This app offers a free version with limited multi-touch and a pro version for an ad-free, expanded experience.
- Touch and move screen for pitch control
- Cosmic delay sounds
- Multi-touch support (2 free, more in pro)
- Adjustable delay time and feedback
- Multiple wave shapes (Sine, Saw, Square, Triangle, Noise)
- Warp and Softness controls
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Spacey Theremin Instruments app. Touch&move screen, will change pitch and Cosmic Delay Sounds!! Multi-touch free:2, pro:more than 2 Pro Version is No ad. Shake phone, put menu at menu->setting Delay On/Off Time Feedback Wave Sine Saw Square Triangle Noise Warp On/Off Softness Volume
Screenshots
Verdict
The clearest difference is in-app purchases: SpaceTheremin at none against Jam Synth's 4. SpaceTheremin also leads on review sentiment (100% vs 84%) and iOS requirement (6.0 vs 12.0). Jam Synth's advantage is rating (5.0 vs 4.8) and ratings volume (28 vs 4). 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. Jam Synth sells 4 one-off in-app purchases. SpaceTheremin asks for nothing beyond the download.
Jam Synth holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Jam Synth has 28 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 84% of Jam Synth's written reviews are positive against 100% of SpaceTheremin's, so the app with the better star average is not the one people write more warmly about.
Jam Synth ships an update every 4 months, SpaceTheremin every 2 months. The most recent releases landed on October 6, 2026 and September 18, 2026 respectively.
| Parameter | Jam Synth | SpaceTheremin |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (28 ratings) — better | 4.8 (4 ratings) |
| Positive reviews | 84.2% of reviews | 100.0% of reviews — better |
| Number of ratings | 28 — better | 4 |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 6.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Derek Mesecar | YUKIO ONOZUKA |
Customer experience
Jam Synth
SpaceTheremin
In-app purchases
Jam Synth
- Intelligent HarmonizerFree
- Rotary VibeFree
- RainbowsFree
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- Time StopperFree
SpaceTheremin
No in-app purchases









