Comparison

AUFX vs Fluss

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

Head to head
About

AUFX

This app offers a versatile stereo dynamics processor with advanced features like a noise gate, compressor/expander, and limiter. It allows for a wide range of audio manipulation, from subtle adjustments to extreme effects, with external side-chain capabilities and high-quality DSP.

Highlights
  • Stereo dynamics processor
  • Noise gate
  • Compressor/expander
  • External side-chain input
  • Lookahead limiter
  • High quality 32-bit DSP
Features
Read full description

A highly tweakable stereo dynamics processor with noise gate, compressor/expander with external side-chain input, and limiter/clipper. From subtle compression, extreme pumping, to maximum loudness! This app is part of the AUFX series, a collection of simple and powerful audio effect apps. • High quality 32-bit DSP engine. • Compressor/expander with optional lookahead buffer. • Allows negative ratios for pumping/cancellation effects. • Hard or soft knee with adjustable radius. • Built-in side-chain low/high cut filters with monitor toggle. • External side-chain input through Inter-App Audio or Audiobus. • Built-in noise gate. • Brick-wall lookahead limiter. • Hard/soft clipper. • Supports "parallell compression". • RMS/Peak envelope followers with attack, release and hold time. • Switchable between Linear and Logarithmic mode. • Automatic makeup gain. • Stereo link on/off. • Process hardware input/output, or other apps through Inter-App Audio or Audiobus (input/filter/output slots supported). • Save, load and share user presets. • Supports Audiobus 2 state saving. • Comes with several bundled presets. • Fully MIDI controllable, including Virtual MIDI. • Background Audio. • Record the result directly in app. • Email recordings or export to AudioShare audio document manager app. • Access user presets and recordings through iTunes File Sharing.

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

AUFX4 screens
Fluss4 screens

Verdict

The call

The clearest difference is price: AUFX at $4.99 against Fluss's $13.99. AUFX also leads on iOS requirement (9.0 vs 12). Fluss's advantage is rating (4.8 vs 4.3) and review sentiment (78% vs 66%). On ratings volume, 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

AUFX 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

Fluss holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 32 and 71 respectively. Written reviews point the same way: 66% of AUFX's written reviews are positive against 78% of Fluss's.

UpkeepUpdate frequency

AUFX ships an update every 5 months, Fluss every 3 months. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 6 level
AUFX versus Fluss: the parameters behind the verdict, then further details
ParameterAUFXFluss
Price$4.99 — better$13.99
Rating4.3 (32 ratings)4.8 (71 ratings) — better
Positive reviews65.8% of reviews78.0% of reviews — better
Number of ratings3271 — better
Update frequencyEvery 5 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better12
Further details — not scored
Size5 MB453 MB
Age rating4+4+
DeveloperKymatica ABBram Bos

Customer experience

AUFX

All ratings32 ratings
Positive84.4%
Neutral6.3%
Negative9.4%
Written reviews38 reviews
Positive65.8%
Neutral13.2%
Negative21.1%

Fluss

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

Bugs and requests

AUFX

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

AUFX

No in-app purchases

None

Fluss

No in-app purchases

Questions

Is AUFX free?
AUFX costs $4.99, with no in-app purchases.
Is Fluss free?
Fluss costs $13.99, with no in-app purchases.
Which has better reviews, AUFX or Fluss?
Fluss is rated higher. AUFX averages 4.3 out of 5 from 32 ratings, while Fluss averages 4.8 from 71 ratings.
Do AUFX or Fluss have ads?
Neither AUFX nor Fluss shows ads.
Which is updated more often, AUFX or Fluss?
AUFX ships an update every 5 months, and Fluss every 3 months. Most recently, AUFX was updated on October 24, 2026 and Fluss on October 30, 2026.

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