Motion Synth vs Seaquence
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Motion Synth
This app turns your iPhone or iPod touch into a musical instrument. Play notes with touch and control sound with motion. It can be used standalone, with other iOS music apps, or even external hardware and laptop software.
- Play notes via touch
- Shape sound through motion
- Control in-app sounds
- Control other iOS music apps
- Control external hardware synths
- Control laptop audio/visual software
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Music through motion: The AUUG Motion Synth transforms your iPhone or iPod touch into an expressive musical instrument that lets you play notes via touch and shape their sound through motion. Visit http://www.auug.com to see a demonstration video. Available here is the free version of the AUUG Motion Synth App, designed to allow users to easily experience motion-based music creation. Follow the in-app video tutorial to learn how to play the musical instrument sounds included with the app (See 'SETUP VIDEO' button). An upgraded version of the app is also available, and has been carefully designed to work with the AUUG Motion Synth Grip. Together, the Motion Synth App and Grip transform your iPhone or iPod touch into a practical and powerful musical instrument. Get yours here: http://www.auug.com/order/ ------ Play in-app sounds, iOS music apps (e.g. GarageBand), or laptop software through movement: The AUUG Motion Synth tracks your movements and screen touches to expressively play in-app musical sounds. The AUUG Motion Synth also allows you to play the sounds of other iOS music apps, giving you access to a vast array of sounds and effects. You can also play external devices like hardware synths or vocal harmonizers as well as control audio or visual software on a laptop (via WiFi or cabled connections). The Motion Synth app is also compatible with the Music IO app, allowing you to control your laptop software via your iPhone cable (Lightning). ------ Use the Motion Synth App by itself or with a Motion Synth Grip: The Motion Synth App has two modes: 1) Single-Key mode (free version): This Motion Synth App mode allows you to quickly engage with motion-based music control, and includes tutorial videos explaining how to use the in-app sounds. 2) Multi-Key mode (upgrade): This Motion Synth App mode is designed to work with the AUUG Motion Synth Grip: a physical holder that securely attaches your iPhone or iPod touch to your hand, thereby improving the dexterity and accuracy with which you can trigger notes via the touch screen.
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.
- Polyphonic synth engine
- Dynamic spatial mixer
- Multitouch interface
- Visual voice editor
- Step-sequencer matrix
- Social sharing features
- Audio/Video recording
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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
Verdict
The clearest difference is rating: Seaquence at 4.6 against Motion Synth's 3.5. Seaquence also leads on review sentiment (85% vs 73%). Motion Synth's advantage is in-app purchases (none vs 1) and iOS requirement (9.0 vs 11.0). On price, ratings volume, update cadence and ads 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. Seaquence sells 1 one-off in-app purchase. Motion Synth asks for nothing beyond the download.
Seaquence holds the better App Store score, 4.6 against 3.5. Both are backed by a comparable volume of ratings — 40 and 74 respectively. Written reviews point the same way: 73% of Motion Synth's written reviews are positive against 85% of Seaquence's.
Motion Synth ships an update every 4 months, Seaquence every 5 months. The most recent releases landed on June 11, 2026 and September 2, 2026 respectively.
| Parameter | Motion Synth | Seaquence |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (40 ratings) | 4.6 (74 ratings) — better |
| Positive reviews | 73.3% of reviews | 84.6% of reviews — better |
| Number of ratings | 40 | 74 — better |
| Update frequency | Every 4 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 48 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | AUUG | Okaynokay |
Customer experience
Motion Synth
Seaquence
Bugs and requests
Motion Synth
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
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- 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)
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- 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
Motion Synth
No in-app purchases
Seaquence
- Seaquence Complete$9.99








