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

# AI voice

> AI voice is artificially generated speech that sounds natural and human-like, used by Thoughtly voice agents to talk with callers in real time over the phone.

**AI Voice** refers to artificially generated speech that sounds natural and human-like. Thoughtly uses advanced text-to-speech models from providers like ElevenLabs and Cartesia to generate realistic voice output. See [Exploring Voices](/agents/voices#explore-tab) to browse and save available voices.