What is the best alternative to Synthflow?

It depends on whether you'd rather self-host or buy a managed product. CyberVerse is the most widely-adopted open-source alternative (1.7k 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 Synthflow?

Yes. CyberVerse, echokit_server, and Pipecat 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 Synthflow 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.

Alternatives · Voice Agents

Synthflow alternatives

Looking for an alternative to Synthflow? 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. Synthflow is a commercial product, so the list below includes both other commercial options and open-source projects you can self-host.

the 10 closest of 32 · all voice agents · how we rank

The product you're replacing

SynthflowPlatformVoice Agents

No-code AI voice agents for inbound and outbound calls.

Paid product

Visit Synthflow →Full Synthflow record

Synthflow's own profile notes it may not be the right fit if you need deep API-level customization. If that's you, the options below are worth comparing.

Building one yourself? Choose and evaluate a voice agent stack →

Commercial alternatives to Synthflow

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

Bland AIPlatformEnterprise platform for AI phone calls that sound human.Paid productVerified

vs Synthflow — Best for enterprises running high-volume outbound and inbound AI phone calls.

Deepgram Voice Agent APIPlatformA unified API for speech recognition, model orchestration and speech synthesis.Paid productVerified

vs Synthflow — Best for developers who want a managed voice pipeline with API-level control of agent behavior and tools.

ElevenLabs AgentsPlatformConversational voice agents powered by ElevenLabs' leading speech models.FreemiumVerified

vs Synthflow — Pricing model differs — Synthflow is a paid product, ElevenLabs Agents is freemium.

Retell AIPlatformBuild AI phone agents with configurable conversation flows and call transfers.Paid productVerified

vs Synthflow — Best for teams configuring AI phone conversations and transfer behavior through a managed platform.

Open-source alternatives to Synthflow

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.Open sourcePython · GPL-3.0Verified · Active 1.7kGitHub stars

vs Synthflow — Synthflow is a commercial product; CyberVerse is open-source and self-hostable.

echokit_serverPlatformOpen Source Voice Agent PlatformOpen sourceRust · GPL-3.0Verified 591GitHub stars

vs Synthflow — Synthflow is a commercial product; echokit_server is open-source and self-hostable.

PipecatFrameworkCompose voice and multimodal agents with Python processing pipelines.Open sourcePython · BSD-2-ClauseVerified · Active 16kGitHub stars

vs Synthflow — Synthflow is a commercial product; Pipecat is open-source and self-hostable.

LiveKit AgentsFrameworkBuild voice and multimodal agents that participate in LiveKit rooms.Open sourcePython · Apache-2.0Verified · Active 14kGitHub stars

vs Synthflow — Synthflow is a commercial product; LiveKit Agents is open-source and self-hostable.

xiaozhi-esp32-serverInfrastructureBackend service for xiaozhi-esp32 -- helps you quickly build an ESP32 device control server.Open sourceJavaScript · MITVerified · Active 11kGitHub stars

vs Synthflow — Synthflow is a commercial product; xiaozhi-esp32-server is open-source and self-hostable.

ten-vadSDK / libraryVoice Activity Detector (VAD): low-latency, high-performance and lightweightOpen sourceCVerified 2.3kGitHub stars

vs Synthflow — Synthflow is a commercial product; ten-vad is open-source and self-hostable.

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Showing the 10 closest. See all 32 voice agents →

Compare Synthflow head-to-head

Frequently asked

What is the best alternative to Synthflow?: It depends on whether you'd rather self-host or buy a managed product. CyberVerse is the most widely-adopted open-source alternative (1.7k 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 Synthflow?: Yes. CyberVerse, echokit_server, and Pipecat 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 Synthflow 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.