Create API keys to use the SDK in your applications.
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Your new API key
Copy this key now. You won't be able to see it again.
HistoryYour compositions
Library
Documentation
Install with AI
Run one command in your project directory. The wizard authenticates you, installs the SDK,
patches your framework config, and wires up a starter sound.
npx @underscore-audio/wizard@latest
Sign in and provision an API key (browser device-code flow)
Detect your framework (Vite, Next, vanilla) and package manager
Install @underscore-audio/sdk and copy WASM assets
Patch vite.config / next.config with COOP/COEP headers
Write .env.local and scaffold a starter sound
Your Publishable Key
Save this -- you won't see it again.
UNDERSCORE_PUBLISHABLE_KEY=
This is a publishable key -- safe for client-side code.
underscore
Make software sound alive
Underscore creates bespoke audio as code for apps, games, and AI
products — generated on demand and shaped in real time by state,
interaction, and behavior.