# Cartesia Sonic

> Streaming text-to-speech models with pronunciation and voice controls.

## Facts
- **Category:** [Voice Agents](https://agentsearchengine.app/category/voice-agents)
- **Type:** Infrastructure
- **Pricing:** Freemium
- **Official site:** https://www.cartesia.ai/sonic
- **Listing on Agent Search Engine:** https://agentsearchengine.app/agents/cartesia-sonic
- **Data verified:** September 2026

## Best for
Developers selecting streaming speech synthesis and testing pronunciation within a custom voice stack.

## Avoid if
You need a complete voice-agent application from this component alone.

## About Cartesia Sonic
Cartesia Sonic converts text into streamed speech for voice applications. Its product documentation describes voice controls and custom pronunciation dictionaries for domain terms. Sonic is the speech-output layer; it is distinct from Cartesia’s managed agent product and does not by itself define a complete conversational application.

## Alternatives
Cartesia Sonic sits in voice agents. Related tools indexed here:
- [Pipecat](https://agentsearchengine.app/agents/pipecat) — Compose voice and multimodal agents with Python processing pipelines. · Open source · Framework · 16k★ · Python · BSD-2-Clause · active 2 days ago
- [LiveKit Agents](https://agentsearchengine.app/agents/livekit-agents) — Build voice and multimodal agents that participate in LiveKit rooms. · Open source · Framework · 14k★ · Python · Apache-2.0 · active 2 days ago
- [xiaozhi-esp32-server](https://agentsearchengine.app/agents/xiaozhi-esp32-server) — Backend service for xiaozhi-esp32 -- helps you quickly build an ESP32 device control server. · Open source · Infrastructure · 11k★ · JavaScript · MIT · active 2 days ago
- [ten-vad](https://agentsearchengine.app/agents/ten-vad) — Voice Activity Detector (VAD): low-latency, high-performance and lightweight · Open source · SDK / library · 2.3k★ · C · active 7 months ago
- [bailing](https://agentsearchengine.app/agents/bailing) — A GPT-4o-like voice conversation robot built from ASR+LLM+TTS, integrating strong models like DeepSeek R1 and openClaw -- a genuine personal voice assistant with latency as low as 800ms. · Open source · Agent · 1.8k★ · Python · MIT · active 5 months ago
- [CyberVerse](https://agentsearchengine.app/agents/cyberverse) — Self hosted, real-time digital human agent platform. Build voice-first AI agents with WebRTC, persona memory, tools, RAG, and optional digital-human video. · Open source · Platform · 1.6k★ · Python · GPL-3.0 · active 5 days ago
- [RCLI](https://agentsearchengine.app/agents/rcli) — Talk to your Mac, query your docs, no cloud required. On-device voice AI + RAG · Open source · Agent · 1.5k★ · C++ · MIT · active 3 days ago
- [Patter](https://agentsearchengine.app/agents/patter) — Open-source voice-AI SDK. The Vapi/Retell alternative for builders who want to own the stack. · Open source · SDK / library · 1.1k★ · Python · MIT · active 22 days ago

---
Source: [Agent Search Engine](https://agentsearchengine.app) — an independent, hand-curated index of AI agents, MCP servers, and frameworks. Rankings are never sold; sponsored placements are labeled and never numbered. Full directory: https://agentsearchengine.app/llms-full.txt