# CosVoice alternatives > Looking for an alternative to CosVoice? Below are the voice agents in our index that do a similar job — Options sharing the subject’s entity type appear first. Within those groups, repository-listed options are ordered by recorded GitHub stars and commercial options alphabetically; activity is shown separately. Sponsorship never affects the order. CosVoice is a commercial product, so the list below includes both other commercial options and open-source projects you can self-host. CosVoice's own profile notes it may not be the right fit if you need dependable two-way SMS now or independently verified calling performance. If that's you, the options below are worth comparing. Browse on the web: https://agentsearchengine.app/alternatives/cosvoice ## Commercial alternatives (alphabetical — stars don't measure commercial adoption) - [Cartesia Sonic](https://agentsearchengine.app/agents/cartesia-sonic) — Streaming text-to-speech models with pronunciation and voice controls. · Freemium · Infrastructure · best for developers selecting streaming speech synthesis and testing pronunciation within a custom voice stack - **vs CosVoice:** Pricing model differs — CosVoice is a paid product, Cartesia Sonic is freemium. - [Bland AI](https://agentsearchengine.app/agents/bland-ai) — Enterprise platform for AI phone calls that sound human. · Paid product · Platform · best for enterprises running high-volume outbound and inbound ai phone calls - **vs CosVoice:** Best for enterprises running high-volume outbound and inbound AI phone calls. - [Deepgram Voice Agent API](https://agentsearchengine.app/agents/deepgram-voice-agent) — A unified API for speech recognition, model orchestration and speech synthesis. · Paid product · Platform · best for developers who want a managed voice pipeline with api-level control of agent behavior and tools - **vs CosVoice:** Best for developers who want a managed voice pipeline with API-level control of agent behavior and tools. - [ElevenLabs Agents](https://agentsearchengine.app/agents/elevenlabs-agents) — Conversational voice agents powered by ElevenLabs' leading speech models. · Freemium · Platform · best for voice agents that need best-in-class speech quality and voice cloning - **vs CosVoice:** Pricing model differs — CosVoice is a paid product, ElevenLabs Agents is freemium. ## Open-source alternatives (ranked by adoption) 1. [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 7 days ago · best for self-hosting the backend for xiaozhi esp32 hardware you already own, with mqtt, udp and websocket transports, mcp access points, voiceprint recognition and a knowledge base - **vs CosVoice:** CosVoice is a commercial product; xiaozhi-esp32-server is open-source and self-hostable. 2. [rustpbx](https://agentsearchengine.app/agents/rustpbx) — A PBX written by rust · Open source · Infrastructure · 812★ · Rust · MIT · active 6 days ago - **vs CosVoice:** CosVoice is a commercial product; rustpbx is open-source and self-hostable. 3. [Pipecat](https://agentsearchengine.app/agents/pipecat) — Compose voice and multimodal agents with Python processing pipelines. · Open source · Framework · 16k★ · Python · BSD-2-Clause · active 6 days ago · best for python developers who want to choose the services and processing stages in a custom voice or multimodal application - **vs CosVoice:** CosVoice is a commercial product; Pipecat is open-source and self-hostable. 4. [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 7 days ago · best for developers building custom voice or multimodal agents around livekit rooms and their own application logic - **vs CosVoice:** CosVoice is a commercial product; LiveKit Agents is open-source and self-hostable. 5. [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 8 months ago · best for frame-level real-time voice activity detection inside a larger voice pipeline, where latency and memory footprint matter - **vs CosVoice:** CosVoice is a commercial product; ten-vad is open-source and self-hostable. 6. [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 · best for experimenting with a low-latency chinese-language voice assistant on modest hardware - **vs CosVoice:** CosVoice is a commercial product; bailing is open-source and self-hostable. Showing the 10 closest of 33 voice agents indexed here. Complete list: https://agentsearchengine.app/category/voice-agents ## FAQ **What is the best alternative to CosVoice?** It depends on whether you'd rather self-host or buy a managed product. xiaozhi-esp32-server is the first repository-listed option in this shortlist (11k GitHub stars); Cartesia Sonic is one of the commercial options. Compare capabilities, license, activity, and costs; this is not a performance benchmark. **Is there a free or open-source alternative to CosVoice?** xiaozhi-esp32-server, rustpbx, and Pipecat are among the repository-listed alternatives. Check each software license and deployment requirements before assuming it is open source or free to operate; model, API, hosting, and managed-service costs can apply. **How are these CosVoice alternatives ranked?** Every other record in the voice agents category is a candidate; the page shows a bounded shortlist. Records sharing the subject’s entity type come first, then repository-listed records are ordered by recorded GitHub stars. Stars do not measure task performance or prove current maintenance. Commercial products are listed separately, with the same entity-type priority and alphabetical order within each group, because stars do not measure commercial adoption. Sponsored placement is always labeled and never affects the ranking. --- Source: [Agent Search Engine](https://agentsearchengine.app) — https://agentsearchengine.app/alternatives/cosvoice