Grasswhistle
Sequenced arpeggiator
About
Create unique melodies from chord progressions with a customizable arpeggiator. Offers randomization, performance options, and over 50 presets. Use it as a standalone instrument or a MIDI effect to sequence other devices.
What's New in Grasswhistle
1.0.1
November 8, 2026
- Fix dropdowns not opening in AUv3 - Fix window sizing on iPhone
Subscriptions & In-App Purchases
$3.00
Small coffee
A small tip to support. Doesn’t unlock any features.
Developer apps
FAQ
What is Grasswhistle?
Grasswhistle is a free arpeggiator app that allows you to build note sequences to arpeggiate your chord progressions. It can be used as a standalone instrument with a built-in synth or as a MIDI effect to sequence other devices.
Is Grasswhistle free to use?
Yes, Grasswhistle is completely free to download and use. While there is an option to send an optional tip to the developer within the standalone app, this does not unlock any additional features.
What devices does Grasswhistle support?
Grasswhistle is available for iPhone, iPad, and iPod touch. It is also available for macOS and Windows in VST3, AU, and AAX formats.
How often is Grasswhistle updated?
The latest version of Grasswhistle is 1.0.1, which was last updated on November 8, 2026. This indicates recent development activity.
What is the age rating for Grasswhistle?
Grasswhistle has an age rating of 4+, making it suitable for a wide range of users.
Can Grasswhistle help with musical inspiration?
Yes, Grasswhistle offers robust randomization features that can provide instant inspiration for creating new melodies and exploring different chord progressions.
Does Grasswhistle have ads?
No, Grasswhistle does not contain advertisements. The app is free to use without any ad interruptions.
What are the benefits of using Grasswhistle as a MIDI effect?
When used as a MIDI effect, Grasswhistle allows you to sequence your favorite external or software synthesizers with endlessly inspiring arpeggios, adding a new layer of creativity to your productions.