> ## Documentation Index
> Fetch the complete documentation index at: https://docs.supertoneapi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> **Welcome to Supertone API**

Supertone API is a RESTful API for using our state-of-the-art AI voice models.\
You can also navigate through our extensive collection of voices or make your own custom voice collection.

## Features

<CardGroup cols={1}>
  <Card title="Voices" icon="magnifying-glass">
    List and search all voices managed by Supertone.
  </Card>

  <Card title="Custom voices" icon="microphone">
    Create custom voices.\
    List, search, and update all your custom voices.\
    (Delete coming soon.)
  </Card>

  <Card title="Text to speech" icon="comment">
    Create or stream speech from text.\
    Predict the length of the generated speech before generation.
  </Card>

  <Card title="Usage" icon="credit-card">
    Get voice usage.\
    Get credit balance.
  </Card>
</CardGroup>