A huge of virtual bank of oscillators/envelopes, continuously overlapping in time (granular fashion), full AUv3 support.

Stria is rated as a Killer App by Apps4iDevices.
Multilevel Interactive Sound Synthesizer
Idea and Csound-Orchestra by Eugenio Giordani
“Stria” is the title of a very important composition by John Chowning and I would like to say that this computer music piece represents the manifest of Frequency Modulation technique applied to audio synthesis, invented by Mr. Chowning himself.

+ Audiobus and Inter-App Audio support
+ Up to 240 Frequency Modulation Oscillators or simple Wavetable Additive
+ Five Spectral Pitch Grid Generators (Geometric, Harmonic, Fibonacci, Scalar, Temperated)
+ MIDI Pad With Scale Grid
+ Effects chain: Doppler, Chopper, Glitch Gen, Sync Grain, Spectral Arpeggiator, FDN Reverb, Dynamic Compressor/Expander
+ Snapshots Presets Morphing Pad
+ Control Manager LFO for Parameters
+ Midibus, Virtual Midi and Network: 14 bit NRPN controllers
+ Capture Master Audio Output
+ File Manager, sharing common audio files via iTunes, Dropbox and AudioCopy
+ Post Fx Chain: Doppler, Chopper, Out Of Range, Sync Granulator, Spectral Arpeggiator, Reverb FDN, Dynamisc Processor
+ Bluetooth A2DP High Quality
+ etc...

What’s New

Version 3.1

- iOS 14 ready
- Audiobus/IAA, improved MIDI Receive
- Updated Audiobus SDK
- Updated AudioCopy SDK
- Updated ABLink SDK
- Host mixDown/freeze works for toggles

Ratings and Reviews

5.0 out of 5
22 Ratings

22 Ratings

CrystalAwareness ,


This thing is also a work of art. It is a sound maker's dream tool. It's very cool that the designer gives such credit to John Chowning and Max Matthews (look them up if you are not familiar.) Hours and hours of very original sounds come out of this. Ps. I'm not affiliated with apeSoft in any way. Even if they wanted to pay me to write these reviews i would turn down the offer. ( not vst versions!)

Edit: made a comparison to iPulsaret but i was thinking iDensity not Stria.
2 years later i am still impressed.

Astromariner ,

Fascinating app -but requires patience

My initial impression was that this app was good for ethereal sound effects. After exploring it in depth by stripping down to the basics, I am now finding there are quite musical alternate tuning capabilities. The ability to modulate every parameter via the controller page opens up endless possibilities. Been able to conjure up sounds and alternate turnings reminiscent of W. Carlos's "Beauty and the Beast". Very cool.

Me knows ,


The only gripe I have with this app is that there is no way (not that I know of) to load your own samples as a sound source. Every other app from Ape Soft has this ability. Other than that this is another stunning, amazing and inspirational music application from Ape Soft. I've gotten some truly odd and amazing soundscapes and sounds out of this app. It's a bit confusing in some ways but if you toy around with it and keep your mind open you'll be pleasantly surprised time and time again.

App Privacy

The developer, apeSoft, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like