SrutiBox vs Fluss
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SrutiBox
This app simulates an Indian harmonium, generating drones with customizable timbres and precise intonations. It offers a realistic bellows-pumping feature and can be used for musical practice, spiritual chanting, or as a tuning aid.
- Indian harmonium simulation
- Customizable drone timbres
- Precise intonation control
- Background audio playback
- Bellows-pumping realism
- Pitch source for tuning
Read full descriptionHide full description
SrutiBox simulates an Indian harmonium, used as a base tone in Indian music and in spiritual practices of chanting and droning. SrutiBox 1.4 now works under iOS8, iPhone 4,5,6, and 6+ sizes, has a slightly different look, and fixes a few bugs that you may have encountered. SrutiBox is a synthesizer, creating drones with various timbres and precise intonations that blur the distinction between tones, timbres and chords. The drone can be fairly static or undergo slow modulation and harmonic change. It now plays in the background under iOS 4.0 like many other music apps! Pop over to http://www.jhhl.net/iPhone/SrutiBox/ and listen to some examples! "I wanted you to know that I have made my debut in Vienna a couple of weeks ago as an iPHONEist. I played two simultaneously - one with sruti box and the other with a variety of apps. I am enjoying sruti box immensely! Thank you!" — Dr. Pauline Oliveros I also have another Droning app, Droneo, which has a similar interface, but more droning options! SrutiBox uses 12 "reeds" which can be tuned to a great number of scales, randomly detuned, and chorused and modulated. The pitch interval and volume of each "reed" can be set individually, making for a wide variety of drones. The reeds can be set to various timbres suitable for drones, including vocal-like timbres and low frequency-friendly chirps. A special iPhone feature of SrutiBox is that you can wave the phone in an imitation of pumping the bellows, adding a touch of realism to the simulation. SrutiBox can also be used as a pitch source for instrument tuning purposes, or as an aid for learning the difference between Just and Equal Tempered intervals. As with other iPhone/iPod touch audio applications, it'll sound better through headphones, although in a quiet room, it's quite effective! Make sure to use the volume controls on the side of the phone to set the volume level you like. See the SrutiBox web pages for more information, hints, and possibly tales of YOUR performances and discoveries: http://www.jhhl.net/iPhone/SrutiBox It's also the place to ask for support and advice, or email tutti-srutti at jhhl.net also: visit my iPhone App Facebook group for starting discussions etc! http://www.facebook.com/group.php?gid=150360054839 Thank You! Check out my other apps: Droneo, Tondo, the iPhone Wind Chimes, Lake Piano and Enumero!
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
Read full descriptionHide 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
Verdict
The clearest difference is price: SrutiBox at $1.99 against Fluss's $13.99. SrutiBox also leads on iOS requirement (7.1 vs 12). Fluss's advantage is rating (4.8 vs 4.3) and ratings volume (72 vs 11). 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
SrutiBox costs $1.99 and Fluss $13.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Fluss holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: Fluss has 72 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 76% of SrutiBox's written reviews are positive against 78% of Fluss's.
Both ship on a similar rhythm, roughly every 3 months. Both last shipped on November 7, 2026.
| Parameter | SrutiBox | Fluss |
|---|---|---|
| Price | $1.99 — better | $13.99 |
| Rating | 4.3 (11 ratings) | 4.8 (72 ratings) — better |
| Positive reviews | 76.0% of reviews | 78.0% of reviews — better |
| Number of ratings | 11 | 72 — better |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 7.1 — better | 12 |
| Further details — not scored | ||
| Size | 13 MB | 453 MB |
| Age rating | 4+ | 4+ |
| Developer | Henry Lowengard | Bram Bos |
Customer experience
SrutiBox
Fluss
User reviews
SrutiBox
From 11 App Store ratingsWhat we love
- 🎶 Great for ambient music
- 🎧 Useful for practicing singers
- 💡 Innovative sound creation
- 🎚️ Flexible interval customization
- ✨ Produces wonderful sounds
Room to improve
- 🔊 Low volume without amplifier
- 💸 Waste of money for some
- ❌ Doesn't sound like Shruti box
- 👎 Not user-friendly interface
- 🔌 Battery drain in background
Fluss
From 72 App Store ratingsWhat we love
- 💡 Innovative touch interface
- 🎶 Great for soundscapes
- ✨ Unique sound manipulation
- 🎛️ Intuitive controls
- 🎵 Highly playable instrument
Room to improve
- 🐛 Crashes frequently
- ⚫ Black screen issue
- 🎧 No audible output
- 🎛️ Not enough control
- 😵 Too much chaos
Bugs and requests
SrutiBox
Reported bugs
4 issues- Background battery drain
- iPhone overheating
- Audible glitches when changing sliders
- Clicks when changing some settings
Requested features
10 requests- Audiobus support
- Built-in sleep timer
- Echo effect
- Preset for Tanbura
- Distort waveform for Tanbura sound
Show 5 moreShow fewer
- Save custom settings/patches
- Add Tamboura sounds
- Stereo reverb setting
- Hide top controls and expand sliders
- Larger help text / better scrolling
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 moreShow fewer
- 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
SrutiBox
No in-app purchases
Fluss
No in-app purchases








