Comparison

synthQ vs Fluss

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

Head to head
About

synthQ

This music creation tool for iPad offers a unique module queuing system and a customizable interface for dynamic sound design. Create complex sounds with virtual cables, a resizable keyboard, and a wide array of modules for production, performance, and education.

Highlights
  • Customizable module queuing system
  • Virtual cable-based modulation
  • Resizable multi-octave keyboard
  • Extensive module library (oscillators, envelopes, filters, FX)
  • Ableton Link support
  • MIDI input/output
  • Preset sharing and import
Features
Read full description

Introducing the queuing synthesizer for iPad. SynthQ has been designed from the ground up with the touchscreen interface in mind. SynthQ is a subtractive synthesizer with a customizable interface. A unique module queuing system, resizable multi-octave keyboard, and intuitive cable-based modulation controls offer a truly dynamic music-making experience for iOS. Each part of the synth is separated into units called modules. Each module snaps into place along a scrollable surface above the keyboard. Control the number of modules shown on the screen at any time. Control which modules appear for each sound. Tap a button on the module menu to launch a module and add it to the queue. Drag a module up and release to remove it from the queue. Drag a module down to move it within the queue. Add variability to your sound by connecting different modules using virtual cables. Alter the sound with synthQ's movable keys. SynthQ provides an intuitive and engaging way to get started creating your own sounds, and is ideal for production, performance and music education environments. Full feature list: MODULES: —three oscillators — sine, triangle, saw, square, pulse and resonant noise waves —three adsrs — amp, filter and modulation envelopes —filter with lowpass, hipass, bandpass, band-reject and peak filter modes —glide —frequency modulation oscillator —ring modulation oscillator —eight modulation bays with virtual cables enable interactions between modules —three tempo-syncable LFOs with sine, triangle, saw, reverse saw, square, random curve and random step waves —two XY matrix pads —XY keys module turns the keyboard's movable keys into modulation sources —sequencer module with Ableton Link support and built-in arpeggiator mode —vocoder using microphone or Inter-App Audio Effect input —two FX slots with chorus, flanger, phaser, reverb, tremolo, distortion, delay and bitcrush —analog simulation with soft clipping and random pitch wavering —midi module with pitch bender, modwheel and velocity —master volume control INTERFACE: —multi-octave resizable keyboard with 10-voice polyphonic, monophonic and legato modes —optional "sticky keys" mode locks each key to your finger after being pressed —when used as a modulation source, sound can be altered by moving the keys in different directions —unique rearrangeable module queuing area defines which controls are present per preset —fully featured preset menu system with options to share and import via e-mail or iTunes File Sharing —import presets directly from iOS mail by tapping and holding the attachment and pressing "Open in synthQ" —functional graphic design and layout eliminates screen switching by keeping the control modules and keyboard in constant view OTHER FEATURES: —Audiobus 3 support with Inter-App Audio —A=432Hz, A=440Hz and A=444Hz tuning modes —44100k Hz, 32000 Hz and 22050 Hz sampling rate modes —MIDI input and output per channel —basic recording feature to save, play, loop, and share recordings —import .WAV files from iTunes File Sharing for playback —parallax motion effects Follow @synthQ on Twitter for latest announcements and free preset packs, updated regularly! Share your presets with the developer for a chance to get them added to an official update!

About

Fluss

Explore granular synthesis with a tactile interface. Import, record, or live-process audio to create unique sound textures, drones, and echoes. Features kinetic sliders for dynamic modulation and a unique shimmer feedback effect.

Highlights
  • Granular synthesis engine
  • Import, record, or live process audio
  • Kinetic sliders for modulation
  • Shimmer feedback effect
  • MIDI playable
  • Oberheim Xpander inspired filter
  • Microtonal experiment support
Features
Read full description

Fluss is a sonic playground designed by Bram Bos and Berlin-based musician Hainbach to let you explore granular synthesis in a hands-on way. The playful touch UI invites anything from live performance, experimentation to learning and mastering the granular concept. Multiple plugins: Import, Record or Live Process You can import your own WAVs (standalone & AUv3 Instrument plugin), Record audio (Record effect plugin) or live-process sound (Process effect plugin) to create anything from drones and granular echoes to moving microtonal audio textures. Designed for touch: Kinetic Sliders All sliders and XY pads are linked to a physics model which lets you flick and throw them around. Minimise the friction for endless bouncing motion, as an innovative substitute for traditional LFOs and modulation. There was never a better reason for using a touchscreen for music. Shimmer Feedback effect Like a shimmer reverb, except it feeds the processed audio back into the grain engine. This lets you create an endless loop of pitch-shifting spaciousness, turning even the simplest of sounds into massive woolly mammoths. - 3 Voice grain engine, each with an independent playhead - Playable via MIDI (since version 1.1) - Filter inspired by the Oberheim Xpander, including its resonant Phase filter - Kinetic sliders and pads for playful interaction with the sound - Universal design (iPhone and iPad; iPad Air 2 or higher recommended) - Custom scales, unquantised mode and even Scala-import for microtonal experiments - Use WAVs (or other audio files), record audio or load the app as a live-processing audio effect - Real world tested as an instrument in numerous live performances by Hainbach - Offers light mode and dark mode UI

Screenshots

Fluss4 screens

Verdict

The call

The clearest difference is rating: Fluss at 4.8 against synthQ's 4.2. Fluss also leads on ratings volume (71 vs 13) and device support (3 vs 1). synthQ's advantage is price ($5.99 vs $13.99). On review sentiment, update cadence, ads and in-app purchases 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

synthQ costs $5.99 and Fluss $13.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Fluss holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: Fluss has 71 ratings behind it against 13, so its average is the more settled of the two. Written reviews complicate that: 80% of synthQ's written reviews are positive against 78% of Fluss's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 1, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
synthQ versus Fluss: the parameters behind the verdict, then further details
ParametersynthQFluss
Price$5.99 — better$13.99
Rating4.2 (13 ratings)4.8 (71 ratings) — better
Positive reviews80.0% of reviews — better78.0% of reviews
Number of ratings1371 — better
Update frequencyEvery 3 monthsEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS12.012
Further details — not scored
Size78 MB453 MB
Age rating4+4+
DeveloperChris NivenBram Bos

Customer experience

synthQ

All ratings12 ratings
Positive66.7%
Neutral25.0%
Negative8.3%
Written reviews25 reviews
Positive80.0%
Neutral12.0%
Negative8.0%

Fluss

All ratings71 ratings
Positive97.2%
Neutral0.0%
Negative2.8%
Written reviews50 reviews
Positive78.0%
Neutral4.0%
Negative18.0%

Bugs and requests

synthQ

Not enough reviews yet to summarise bugs or requests.

Fluss

Reported bugs

4 issues
  • Crashes with black screen
  • No audible output
  • App resets when put in background
  • Cyan play head difficult to see on waveform

Requested features

20 requests
  • Adjustable layer field per grain
  • Record from internal microphone
  • More control over grain direction
  • BPM settings
  • Transition from clean to new sounds
Show 15 more
  • AUv3 plugin version
  • Scan speed multiplier (x2, x4)
  • Draw lines on pitch XY pad
  • Lock oscillators on pitch XY pad
  • Assign play heads triggered by external controller
  • Snapshots for pitch section
  • More clock and tempo syncing options
  • Visualization of buffer, playback head speed, modulation
  • Quantizer visualization
  • User-changeable pitch XY pad layout
  • Global friction and separate sensitivity option
  • Modulation to specific play head
  • Proper sampling button (microphone access)
  • Preset browser arrows
  • More control over panning, filter, scan speed

In-app purchases

None

synthQ

No in-app purchases

None

Fluss

No in-app purchases

Questions

Is synthQ free?
synthQ costs $5.99, with no in-app purchases.
Is Fluss free?
Fluss costs $13.99, with no in-app purchases.
Which has better reviews, synthQ or Fluss?
Fluss is rated higher. synthQ averages 4.2 out of 5 from 13 ratings, while Fluss averages 4.8 from 71 ratings.
Do synthQ or Fluss have ads?
Neither synthQ nor Fluss shows ads.
Which is updated more often, synthQ or Fluss?
synthQ ships an update every 3 months, and Fluss every 3 months. Most recently, synthQ was updated on October 1, 2026 and Fluss on October 25, 2026.

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