Skip to content
Agent Search Engine

Alternatives · Voice Agents

Retell AI alternatives

Looking for an alternative to Retell AI? Below are the voice agents in our index that do a similar job — open-source options are ranked by real maintained adoption (GitHub stars and recent commit activity), never by sponsorship. Retell AI is a commercial product, so the list below includes both other commercial options and open-source projects you can self-host.

28 alternatives · all voice agents · how we rank

The product you're replacing

Retell AIPlatformVoice Agents

Build production-ready AI phone agents with ultra-low latency.

Paid product

Visit Retell AI →Full Retell AI record

Retell AI's own profile notes it may not be the right fit if you need on-premise deployment of voice infrastructure. If that's you, the options below are worth comparing.

Building one yourself? How to build a voice AI agent →

Commercial alternatives to Retell AI

Listed alphabetically — GitHub stars don't measure commercial adoption.

Bland AIPlatformEnterprise platform for AI phone calls that sound human.Paid productElevenLabs AgentsPlatformConversational voice agents powered by ElevenLabs' leading speech models.FreemiumSynthflowPlatformNo-code AI voice agents for inbound and outbound calls.Paid productVapiPlatformDeveloper platform for building, testing, and deploying voice AI agents.Paid product

Open-source alternatives to Retell AI

Ranked by maintained adoption — self-hostable and free to run.

CyberVersePlatformSelf hosted, real-time digital human agent platform. Build voice-first AI agents with WebRTC, persona memory, tools, RAG, and optional digital-human video.Python · 1.6k stars · GPL-3.0 · Aug 2026echokit_serverPlatformOpen Source Voice Agent PlatformRust · 590 stars · GPL-3.0 · Feb 2026xiaozhi-esp32-serverInfrastructureBackend service for xiaozhi-esp32 -- helps you quickly build an ESP32 device control server.JavaScript · 10k stars · MIT · Aug 2026ten-vadSDK / libraryVoice Activity Detector (VAD): low-latency, high-performance and lightweightC · 2.2k stars · Feb 2026bailingAgentA 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.Python · 1.8k stars · MIT · Apr 2026RCLIAgentTalk to your Mac, query your docs, no cloud required. On-device voice AI + RAGC++ · 1.5k stars · MIT · Aug 2026PatterSDK / libraryOpen-source voice-AI SDK. The Vapi/Retell alternative for builders who want to own the stack.Python · 1.0k stars · MIT · Aug 2026rustpbxInfrastructureA PBX written by rustRust · 754 stars · MIT · Aug 2026StarmoonFrameworkA conversational, AI device + software framework for companionship, entertainment, education, healthcare, IoT applications, and DIY robotics.TypeScript · 549 stars · GPL-3.0 · Mar 2026JARVISAgentYour own personal voice assistant: Voice to Text to LLM to Speech, displayed in a web interfacePython · 525 stars · GPL-3.0 · Jun 2024deepgram-python-sdkSDK / libraryOfficial Python SDK for Deepgram.Python · 458 stars · MIT · Aug 2026bolnaAgentEnd-to-end platform for building voice first multimodal agentsPython · 431 stars · MIT · Oct 2024
Signal inventory open — put your agent in front of people choosing oneReserve a signal slot →
xybridSDK / libraryBuild apps powered by on-device AIRust · 425 stars · Apache-2.0 · Aug 2026ai-avatar-systemAgentAI Avatar / digital human platform — upload a photo, clone a voice, talk to any face in real time with lip-sync video. Open-source, self-hosted. Claude · Whisper · Chatterbox · MuseTalk.Python · 417 stars · MIT · Jul 2026sutandoAgentMy AI Stand. Realtime by day, rewriting itself by night. Summon my AI superpower.Python · 386 stars · MIT · Aug 2026agent-second-brainAgentAn always-on second brain you talk to. Voice notes in Telegram → typed, linked knowledge in your Obsidian vault. Runs 24/7 on the Claude subscription you already have.Python · 358 stars · MIT · Aug 2026LLMVoXSDK / libraryLLMVoX: Autoregressive Streaming Text-to-Speech Model for Any LLMPython · 310 stars · May 2025deepgram-js-sdkSDK / libraryOfficial JavaScript SDK for Deepgram.TypeScript · 272 stars · MIT · Aug 2026M.I.L.E.SAgentM.I.L.E.S, a GPT-4-Turbo voice assistant, self-adapts its prompts and AI model, can play any Spotify song, adjusts system and Spotify volume, performs calculations, browses the web and internet,Python · 232 stars · MIT · Jul 2026gdansk-aiAgentFull stack voice chatbotTypeScript · 199 stars · GPL-2.0 · Oct 2024active-callAgentA SIP/WebRTC voice agentRust · 187 stars · Aug 2026axiom-voice-agentAgentRun a <400ms latency Voice Agent on just 4GB VRAM. Fully offline, no API keys required. Optimized for GTX 1650 and edge robotics with zero-copy inference. (Apache 2.0)Python · 144 stars · Apache-2.0 · May 2026BentoVoiceAgentAgentBuild Phone Calling Voice Agent fully powered by open source models.Python · 130 stars · Jul 2026AI-Voice-AgentAgentSelf-hosted AI voice agentPython · 39 stars · MIT · Aug 2026

Compare Retell AI head-to-head

Frequently asked

What is the best alternative to Retell AI?
It depends on whether you'd rather self-host or buy a managed product. CyberVerse is the most widely-adopted open-source alternative (1.6k GitHub stars); Bland AI is one of the commercial options. Compare the full list above on adoption, license, and pricing.
Is there a free or open-source alternative to Retell AI?
Yes. CyberVerse, echokit_server, and xiaozhi-esp32-server are open-source voice agents you can self-host for free — you still pay for the infrastructure you run them on and any model or API usage. See the ranked open-source list above.
How are these Retell AI alternatives ranked?
Every product in the voice agents category is a candidate. Open-source alternatives are ranked by maintained adoption — GitHub stars plus recent commit activity — so you see what's genuinely used, not abandoned. Commercial products are listed separately and alphabetically, because stars don't measure commercial adoption. Sponsored placement is always labeled and never affects the ranking.