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

Transform your device into a versatile synthesizer with extensive sound-shaping capabilities. Explore a wide range of waveforms, envelopes, and effects. Record and share your musical creations as WAV files.

Highlights
  • Multiple oscillators and waveforms
  • Extensive envelope and LFO modulation
  • Built-in distortion, EQ, chorus, delay, reverb
  • Responsive keyboard with MIDI support
  • Poly, mono, and legato voice modes
  • Customizable scales and tunings
  • Performance recording and WAV export
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 in-app purchases: SpaceTheremin at none against Synthesizer Sim's 3. SpaceTheremin also leads on ads (none vs shown) and rating (4.8 vs 4.3). Synthesizer Sim's advantage is ratings volume (16 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 3 in-app purchases, starting at $2.99 per month. SpaceTheremin asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

SpaceTheremin holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 4 and 16 respectively.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 6, 2026 and November 4, 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) — better4.3 (16 ratings)
Positive reviews100.0% of reviews—
Number of ratings416 — better
Update frequencyEvery 2 monthsEvery 2 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 MB54 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 ratings16 ratings
Positive75.0%
Neutral12.5%
Negative12.5%

In-app purchases

None

SpaceTheremin

No in-app purchases

3 purchases

Synthesizer Sim

Subscriptions2
  • Premium Monthly$2.991 Month
  • Premium Yearly7 Days trial$14.991 Year
One-time1
  • Lifetime Premium$29.99

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 4.3 from 16 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 2 months. Most recently, SpaceTheremin was updated on November 6, 2026 and Synthesizer Sim on November 4, 2026.

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