Fluss vs OUTSIDIFY
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
OUTSIDIFY
Explore and manipulate ambient sounds using your smartphone's microphone and speaker. Create unique audio effects, capture environmental resonances, and experiment with sound in real-world spaces. Unleash your creativity and discover new sonic possibilities.
- Create feedback loops
- Manipulate external sounds
- Use phone as resonant filter
- Capture impulse responses
- Explore real-world acoustics
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Outsidify allows you to manipulate and explore the sounds happening around your smartphone. The microphone and speaker of your phone are hiding exciting potential: create feedback, manipulate resonances, use your mouth as a resonant filter, capture the impulse responses of your coffee cup or the pipe at the construction site you're accidentally passing by. Just have fun. Your imagination is the only limit. Early electronic music was full of exploration of what you can do with just a microphone and speaker. Now it's your time to explore! Go outside and make sounds outside of your phone. What would you Outsidify? Features - create feedbacks from your phone´s microphone and speaker - play sounds from the speaker and influence them with outside conditions - the world is your resonator - capture impulse responses of any space you can fit your phone into - anytime!
Screenshots
Verdict
The clearest difference is price: OUTSIDIFY at $5.99 against Fluss's $13.99. OUTSIDIFY also leads on update cadence (weekly vs every 3 months) and review sentiment (89% vs 78%). Fluss's advantage is ratings volume (71 vs 15) and iOS requirement (12 vs 15.2). On rating, ads, in-app purchases and monetization model 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
Fluss costs $13.99 and OUTSIDIFY $5.99 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 Fluss against 4.9 for OUTSIDIFY. Both are backed by a comparable volume of ratings — 71 and 15 respectively. Written reviews are what separate them: 78% of Fluss's written reviews are positive against 89% of OUTSIDIFY's.
Fluss ships an update every 3 months, OUTSIDIFY weekly. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | Fluss | OUTSIDIFY |
|---|---|---|
| Price | $13.99 | $5.99 — better |
| Rating | 4.8 (71 ratings) | 4.9 (15 ratings) — better |
| Positive reviews | 78.0% of reviews | 88.9% of reviews — better |
| Number of ratings | 71 — better | 15 |
| Update frequency | Every 3 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12 — better | 15.2 |
| Further details — not scored | ||
| Size | 453 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Bram Bos | BASTL INSTRUMENTS |
Customer experience
Fluss
OUTSIDIFY
Bugs and 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
OUTSIDIFY
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Fluss
No in-app purchases
OUTSIDIFY
No in-app purchases








