AssistantsCustom voices

Cartesia

Set up a custom Cartesia voice in Vapi

This guide shows you how to use a voice you created with Cartesia in your Vapi assistant. Cartesia’s prebuilt voices are already available in the Voice Library; follow this page only to use your own custom voice.

A Cartesia account and API key are required for this process.
1

Create a Cartesia account and voice

Sign up at Cartesia, then create a custom voice in the Cartesia playground. Note that you will need to set the access of the voice to public in Cartesia to use it in Vapi. Check their docs for more information.

2

Retrieve your Cartesia API key

Get your API key from your Cartesia account.

3

Enter your API key in Vapi

In the Vapi Dashboard, open Settings, then Integrations, and add your Cartesia API key under Cartesia.

Once you save, your Cartesia voices sync automatically.

4

Select your custom voice

Open an assistant and open Voice Settings. Choose Cartesia as the provider and select your voice, or switch to Custom Voice ID and paste your Cartesia voice ID. You can find your voice ID in the Voice Library.