Fractal Bits vs Fluss
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fractal Bits
Generate an infinite variety of drum sounds using fractal algorithms. Save and share your unique sound sets via text codes. Perform live with multiple keyboard options and record your creations in real-time.
- Infinite unique drum sounds
- Save/share sound sets via text codes
- Multiple live drumming keyboards
- MIDI control and mapping
- Real-time WAV audio recording
- Wi-Fi export/import
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Fractal Bits is a drum synth with over four billion unique sounds created by fractal algorithms. Each set of 12 drums corresponds to a code of 8 characters (you can save/copy/paste it as plain text). Features: * Audio Unit Extension (AUv3), Audiobus; * search for new sounds with three buttons: next random set, edit code, previous set; * three types of keyboards for live drumming: on-screen buttons, PC keyboard, MIDI input; * several processing parameters + control via MIDI; * real-time audio recording to WAV (32-bit); * export to: WAV (one file or a set), SunVox (samples + effects in one file), text clipboard; * the LCK button freezes individual drums - they will not change during the search for new sets; * Wi-Fi export/import. Double clicking on a parameter opens a window for setting the exact value. If you enable the Hold option, the notes will play endlessly, without reacting to key release (noteOff) events; turning the note on again works like turning it off; there are two ways to enable this option: 1) using the Hold parameter in the "MIDI Mapping" window; 2) by pressing the HOLD button, which appears in place of LCK while playing the musical keyboard: press HOLD, release the desired notes - then the released notes will continue to play.
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.
- 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
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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
Verdict
The clearest difference is price: Fractal Bits at $1.99 against Fluss's $13.99. Fractal Bits also leads on review sentiment (91% vs 78%). 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
Fractal Bits costs $1.99 and Fluss $13.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.8 for Fractal Bits against 4.8 for Fluss. Both are backed by a comparable volume of ratings — 80 and 70 respectively. Written reviews are what separate them: 91% of Fractal Bits's written reviews are positive against 78% of Fluss's.
Fractal Bits ships an update every 5 months, Fluss every 3 months. The most recent releases landed on September 22, 2026 and September 18, 2026 respectively.
| Parameter | Fractal Bits | Fluss |
|---|---|---|
| Price | $1.99 — better | $13.99 |
| Rating | 4.8 (80 ratings) | 4.8 (70 ratings) |
| Positive reviews | 90.7% of reviews — better | 78.3% of reviews |
| Number of ratings | 80 — better | 70 |
| Update frequency | Every 5 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12 |
| Further details — not scored | ||
| Size | 7 MB | 453 MB |
| Age rating | 4+ | 4+ |
| Developer | Alexander Zolotov | Bram Bos |
Customer experience
Fractal Bits
Fluss
Bugs and requests
Fractal Bits
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
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- 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
Fractal Bits
No in-app purchases
Fluss
No in-app purchases









