Comparison

SpaceTheremin vs Synthesizer Sim

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Read full description

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

About

Synthesizer Sim

This app transforms your device into a versatile music creation studio, offering a responsive synth keyboard and advanced sound design tools. Explore a wide range of sounds, record your performances, and share your music instantly. It supports MIDI input and includes rhythm tools for practice and live performance.

Highlights
  • Responsive synth keyboard
  • Advanced sound design engine
  • Built-in effects and modulation
  • MIDI keyboard support
  • Rhythm accompaniment and metronome
  • Performance recording and sharing
Read full description

Turn your iPhone or iPad into an expressive synthesizer. Shape original sounds, play with touch or an external MIDI controller, and capture performances for later playback or WAV sharing. SYNTHESIZE YOUR SOUND • Three oscillators plus a sub oscillator • Six waveforms, unison, detune, mixer and stereo pan controls • Amp and filter envelopes with low-pass, high-pass, band-pass and notch modes • Distortion, EQ, chorus, delay and reverb • Two LFOs for pitch, amplitude and filter modulation PLAY AND CONTROL • Responsive keyboard with velocity, sustain, pitch bend and transpose • Poly, mono and legato voice modes with glide • USB, Bluetooth and network MIDI input • MIDI note, velocity, pitch bend and common controller support PRESETS AND TUNING • 96 factory presets for pads, leads, basses and more • Save your own User presets • Western, world and makam scales • Adjustable root, A4 reference and per-note cent offsets • Save custom User tunings RECORD AND SHARE • Record synth performances without microphone access • Replay saved performances with their sound and tuning settings • Export and share recordings as WAV files FREE AND PREMIUM The free version includes 10 factory presets, up to three User presets and tunings, one saved performance, and optional rewarded access to additional sounds. It may display ads. Premium removes ads and unlocks all 96 factory presets, unlimited User presets and tunings, and unlimited saved performances. Choose a monthly or yearly auto-renewing subscription, or a one-time lifetime purchase. Purchases are managed through your App Store account and can be restored in the app. Terms of Use: https://alyakastudio.com/terms/ Privacy Policy: https://alyakastudio.com/privacy-policy/

Screenshots

SpaceTheremin4 screens
Synthesizer Sim4 screens

Verdict

The call

The clearest difference is rating: SpaceTheremin at 4.8 against Synthesizer Sim's 4.2. SpaceTheremin also leads on in-app purchases (none vs 1) and ads (none vs shown). Synthesizer Sim's advantage is ratings volume (13 vs 4). On price, update cadence 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Synthesizer Sim sells 1 one-off in-app purchase. SpaceTheremin asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

SpaceTheremin holds the better App Store score, 4.8 against 4.2. Both are backed by a comparable volume of ratings — 4 and 13 respectively.

UpkeepUpdate frequency

SpaceTheremin ships an update every 2 months, Synthesizer Sim every 3 months. The most recent releases landed on September 18, 2026 and October 8, 2026 respectively.

Scorecard6 real differences · 4 level
SpaceTheremin versus Synthesizer Sim: the parameters behind the verdict, then further details
ParameterSpaceThereminSynthesizer Sim
PriceFreeFree
Rating4.8 (4 ratings) — better4.2 (13 ratings)
Positive reviews100.0% of reviews—
Number of ratings413 — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS6.0 — better15.0
Further details — not scored
Size6 MB53 MB
Age rating4+4+
DeveloperYUKIO ONOZUKAAlper Kahriman

Customer experience

SpaceTheremin

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Synthesizer Sim

All ratings13 ratings
Positive69.2%
Neutral15.4%
Negative15.4%

In-app purchases

None

SpaceTheremin

No in-app purchases

1 purchases

Synthesizer Sim

One-time1
  • Get Premium$9.99

Questions

Is SpaceTheremin free?
SpaceTheremin is free to download, with no in-app purchases.
Is Synthesizer Sim free?
Synthesizer Sim is free to download, with in-app purchases available.
Which has better reviews, SpaceTheremin or Synthesizer Sim?
SpaceTheremin is rated higher. SpaceTheremin averages 4.8 out of 5 from 4 ratings, while Synthesizer Sim averages 4.2 from 13 ratings.
Do SpaceTheremin or Synthesizer Sim have ads?
Synthesizer Sim shows ads; SpaceTheremin does not.
Which is updated more often, SpaceTheremin or Synthesizer Sim?
SpaceTheremin ships an update every 2 months, and Synthesizer Sim every 3 months. Most recently, SpaceTheremin was updated on September 18, 2026 and Synthesizer Sim on October 8, 2026.

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