Grainstorm

In-app purchases
4.4
1.13K reviews
100K+
Downloads
Content rating
Everyone
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About this app

Use as/for:
• Tool for Sound Design
• Experimental Musical Instrument
• Fun

Key Features:
• Fast and lightweight
• Four tracks
• Stereo Mode
• Loads sound files of up to seven minutes length in any audio format
• Effects like Convolution Reverb, Channel Vocoder, Phase Vocoder

First use instructions:
1. Press POWER. Upper right power button turns on audio engine which is TURNED OFF on startup to save battery.
2. Press EJECT. Load a sound file.
3. Press PLAY.

A manual can be found here: https://grainstorm.rocks.me

There is an In-App-Purchase which among other things lets you record the output. Please consider the free version as a demo version.
Updated on
Nov 11, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection

Ratings and reviews

4.4
1.05K reviews
Kris
December 19, 2020
This app is essential for any ambient/noise musician. I've been using the pro version for over 1 year and it has allowed me to make some serious tracks while travelling/not in the studio. It can turn anything into an endlessly evolving ethereal dream or your worst nightmare. EDIT: The new update has heavily limited the types of audio files you can import, putting a wrench in the workflow/capabilities. I reached out to them about and am awaiting response.
59 people found this review helpful
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Ben Morris
November 7, 2025
Outstanding. Nothing on the market close to this app. Full version is actually worth the price. Very clever well developed truly innovative app. Need more like this. Ps...If you can develop a functioning usb based input recording software that can be used with external soundcards akin to Soundforge etc I would definitely be on board if it's of this standard. really well done! thanks 😊
1 person found this review helpful
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*&39;# *&39;er T'Floobius
January 8, 2026
Really nice looking piece of useless garbage?.. Cant get this app able to do anything usefull except make sounds/music sound stupid, just a messy kids toy!, buggy as F rarely loads up without everything jumbled up and not scaled to work, Haven't these devs ever thought that users could do with some built in interactive help an tutorials?, this program does absolutely nowt!!! Time wasters.....
1 person found this review helpful
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What’s new

Bugfixes