Comparison

shapesynth vs Fluss

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

Head to head
About

shapesynth

Create unique retro-inspired sounds by drawing oscillator waveforms. This polyphonic synthesizer offers extensive modulation options, built-in effects, and recording capabilities. Seamlessly integrate with other music apps and hardware for a versatile creative experience.

Highlights
  • Draw custom oscillator waveforms
  • 16-voice polyphony
  • Arpeggiator and stereo delay
  • Resonant filter
  • Parameter modulation via keyboard, MPE, accelerometer
  • Tape recorder with infinite overdubs
  • Inter-app audio and AUv3 support
Features
Read full description

Shape is a polyphonic synthesiser allowing the user to draw the shape of the oscillator waveform. The first half of the oscillator is represented by 32 blocks and the second half is its mirror, generating all sorts of possible raw retroish sounds. 16 pages per oscillator allows to interpolate between different shapes. Add effects like arpeggio, stereo delay and a resonant filter and record your sounds on a classic tape. Modulate any parameter with keyboard, MIDI MPE or the device accelerometer. Connect to other apps with AudioBus, IAA, AUv3 and midi. +++ 16 voice polyphony +++ 2 oscillators, draw your own shape +++ 3 oscillator mixing functions (add, subtract or multiply) +++ Lfo modulation with ADSR: envelope, pitch, duty cycle, square, page or filter +++ Record on tape with infinite overdubs (save, load, import, export) +++ Arpeggiator +++ Stereo delay +++ Resonant filter (low, band and high pass) +++ Modulate any parameter using keyboard, MIDI MPE or accelerometer (Built in or Sphero) +++ Mini linear sequencer with euclidean rhythm +++ On screen 25 key stylophone style keyboard +++ AudioBus, Inter App Audio and AUv3 +++ Ableton link or AUv3 host sync +++ CoreMIDI, IAA MIDI, Bluetooth MIDI, limited MPE and MIDI out +++ Audio Paste, files app drag’n drop or open with

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

shapesynth4 screens
Fluss4 screens

Verdict

The call

The clearest difference is price: shapesynth at $4.99 against Fluss's $13.99. shapesynth also leads on iOS requirement (9.0 vs 12). Fluss's advantage is review sentiment (78% vs 65%). On rating, 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

CostPrice · In-app purchases · Ads · Monetization

shapesynth costs $4.99 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

On the App Store both sit at effectively the same score — 4.9 for shapesynth against 4.8 for Fluss. Both are backed by a comparable volume of ratings — 24 and 71 respectively. Written reviews are what separate them: 65% of shapesynth's written reviews are positive against 78% of Fluss's.

UpkeepUpdate frequency

shapesynth ships an update every 2 months, Fluss every 3 months. The most recent releases landed on October 23, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
shapesynth versus Fluss: the parameters behind the verdict, then further details
ParametershapesynthFluss
Price$4.99 — better$13.99
Rating4.9 (24 ratings) — better4.8 (71 ratings)
Positive reviews65.1% of reviews78.0% of reviews — better
Number of ratings2471 — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better12
Further details — not scored
Size8 MB453 MB
Age rating4+4+
DeveloperErik SigthBram Bos

Customer experience

shapesynth

All ratings24 ratings
Positive95.8%
Neutral4.2%
Negative0.0%
Written reviews43 reviews
Positive65.1%
Neutral9.3%
Negative25.6%

Fluss

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

Bugs and requests

shapesynth

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

shapesynth

No in-app purchases

None

Fluss

No in-app purchases

Questions

Is shapesynth free?
shapesynth costs $4.99, with no in-app purchases.
Is Fluss free?
Fluss costs $13.99, with no in-app purchases.
Which has better reviews, shapesynth or Fluss?
shapesynth is rated higher. shapesynth averages 4.9 out of 5 from 24 ratings, while Fluss averages 4.8 from 71 ratings.
Do shapesynth or Fluss have ads?
Neither shapesynth nor Fluss shows ads.
Which is updated more often, shapesynth or Fluss?
shapesynth ships an update every 2 months, and Fluss every 3 months. Most recently, shapesynth was updated on October 23, 2026 and Fluss on October 30, 2026.

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