Comparison

SpaceTheremin vs Seaquence

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

Seaquence

Create dynamic, layered music with a unique visual interface. Explore ambient drones, intricate rhythms, and share your creations with a global community. Unlock advanced tools and MIDI support with an optional upgrade.

Highlights
  • Polyphonic synth engine
  • Dynamic spatial mixer
  • Multitouch interface
  • Visual voice editor
  • Step-sequencer matrix
  • Social sharing features
  • Audio/Video recording
Features
Read full description

Seaquence is a beautiful and lush sounding synthesizer with vast potential for creativity and exploration. Its uniquely designed interface allows you to create music with swimming creatures in a stereo mixing dish. Multiple voices are heard simultaneously, resulting in layered, dynamic compositions. Seaquence's wide sonic template allows you to create everything from ambient drones to intricately layered rhythms and transients. With its playful and colorful interface, even composers who are brand new to music will be able to unlock their synesthetic creativity. You can save your sessions, post and share them, and explore the Seaquence Galaxy to listen what others have shared and get inspired! Upgrading to Seaquence Complete unlocks more tools, effects, and Midi i/o support. Features Included in Free Download • Polyphonic synth engine • Dynamic spatial mixer and stereo-panning engine • 5 note polyphony per voice • 8 simultaneously voices • 64 unique voices in a composition (only the closest 8 voices are heard) • A true multitouch experience, up to 11 simultaneous touch points supported • Intuitive visual multitouch voice editor • Unique swimming physics and swim behaviors — swim patterns are based on synth and sequencer parameters per-voice • 16 x 16 multitouch step-sequencer matrix • Radial chromatic scale editor with octave • Amplitude envelope generator + length (ADSR+L) with curves and hold • Precision, sample-based clock and sequencing engine • Variable tempo, supporting 1 to 360 BPM with tap-tempo. • Global session transpose • 5 waveform shapes: Square, Saw, Tri, Sin, Noise • Save your own session presets • 30+ included session presets • Social sharing features - post and share links to sessions • Session links are maintained — trace back the history of a composition, see who remixed a session • Audio and Video recording and export using Apple ReplayKit. Share performances! Features of Seaquence Complete (unlocked with a single In-App Purchase) • Per-voice state-variable filter with morphable hi-pass, band-pass, lo-pass, and notch modes • Filter attack envelope generator with resonance (Q) and curve • Swing/Shuffle • Step length subdivision: 1/1 to 1/64, including triplets • Portamento/Glide with curve editor • Additional monophonic voice modes: Sub-Oscillator tuned to a 5th and Detuned Unison • Delay effect on the master channel with feedback and individual voice fx-send • MIDI notes i/o per voice • MIDI cc i/o per voice • MIDI clock sync • Assignable MIDI notes/cc/clock in/out per MIDI device • User-adjustable MIDI Latency • Optionally enable/disable Audio engine when using MIDI Your purchase directly supports our two-person studio and helps us continue to release updates with new features and bug fixes! Thanks for your support.

Screenshots

SpaceTheremin4 screens
Seaquence4 screens

Verdict

The call

The clearest difference is in-app purchases: SpaceTheremin at none against Seaquence's 1. SpaceTheremin also leads on review sentiment (100% vs 85%) and update cadence (every 2 months vs every 5 months). Seaquence's advantage is ratings volume (81 vs 4). On price, rating, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Seaquence 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 4.6. That said, the two scores are not equally well evidenced: Seaquence has 81 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 100% of SpaceTheremin's written reviews are positive against 85% of Seaquence's.

UpkeepUpdate frequency

SpaceTheremin ships an update every 2 months, Seaquence every 5 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

Scorecard6 real differences · 4 level
SpaceTheremin versus Seaquence: the parameters behind the verdict, then further details
ParameterSpaceThereminSeaquence
PriceFreeFree
Rating4.8 (4 ratings) — better4.6 (81 ratings)
Positive reviews100.0% of reviews — better84.6% of reviews
Number of ratings481 — better
Update frequencyEvery 2 months — betterEvery 5 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS6.0 — better11.0
Further details — not scored
Size6 MB8 MB
Age rating4+4+
DeveloperYUKIO ONOZUKAOkaynokay

Customer experience

SpaceTheremin

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

Seaquence

All ratings74 ratings
Positive90.5%
Neutral2.7%
Negative6.8%
Written reviews65 reviews
Positive84.6%
Neutral6.2%
Negative9.2%

Bugs and requests

SpaceTheremin

Not enough reviews yet to summarise bugs or requests.

Seaquence

Reported bugs

6 issues
  • App immediately crashes upon launch
  • MIDI function doesn't work
  • Menu system is confusing
  • App not opening on iPhone 12 mini
  • App kicks user back to home page
Show 1 more
  • IAP purchase not recognized across devices

Requested features

18 requests
  • Mix sound with other apps (AUM/Audiobus)
  • Airplay support
  • Zoom in/out for larger creature populations
  • Audio Unit support
  • Manual in the app (PDF version)
Show 13 more
  • Ableton Link
  • MIDI Channel per creature
  • Competitive mode (online)
  • Creature interaction
  • LFOs for animation
  • Multiple MIDI channels out
  • Set playback time/schedule
  • Creature path setting
  • Android version
  • Audiobus or IAA implementation
  • Landscape mode
  • Arrangement tool for longer compositions
  • Like/dislike function for songs

In-app purchases

None

SpaceTheremin

No in-app purchases

1 purchases

Seaquence

One-time1
  • Seaquence Complete$9.99

Questions

Is SpaceTheremin free?
SpaceTheremin is free to download, with no in-app purchases.
Is Seaquence free?
Seaquence is free to download, with in-app purchases available.
Which has better reviews, SpaceTheremin or Seaquence?
SpaceTheremin is rated higher. SpaceTheremin averages 4.8 out of 5 from 4 ratings, while Seaquence averages 4.6 from 81 ratings.
Do SpaceTheremin or Seaquence have ads?
Neither SpaceTheremin nor Seaquence shows ads.
Which is updated more often, SpaceTheremin or Seaquence?
SpaceTheremin ships an update every 2 months, and Seaquence every 5 months. Most recently, SpaceTheremin was updated on November 6, 2026 and Seaquence on November 2, 2026.

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