What is Line?
Line brings voice to your text agents with Cartesia’s state-of-the-art speech models. We handle audio orchestration, deployment, and observability so you can focus on your agent’s reasoning.Get Started
Quickstart
Build, deploy, and call your first agent
Agent Builder
Prototype and iterate on agents without code
SDK
Write your custom reasoning logic in code
Audio Orchestration
Line deploys your code in seconds in our managed runtime with auto-scaling and blazing fast audio processing, using Ink for speech-to-text and Sonic for text-to-speech.
What You Can Build
Line gives you full control over your agent’s behavior through code: connect any LLM, call external APIs, query databases, and handle interruptions and turn-taking.Developer Tools
- CLI – Deploy and test agents from your terminal
- Call logs – Debug conversations and monitor performance
- Evaluations – Measure agent quality with custom metrics
- Deployments – Track versions and roll back changes