Retell vs. Vapi vs. LiveKit for voice AI agents: A comparison for developers

Retell, Vapi, and LiveKit can all support basic voice-agent use cases, but the comparison argues that their differences become clearer in production, particularly around ongoing iteration, customization, supported channels, and scaling costs. Retell is presented as a managed, visual-editor platform suited to nontechnical operations or business teams and includes packaged features such as phone numbers, SMS, knowledge bases, and batch calling, though its flexibility is limited to exposed configuration options. Vapi offers a developer-oriented managed platform built around configuration, APIs, webhooks, and standard customer-service or campaign workflows, providing more tuning options than Retell but retaining platform-defined schemas and defaults. LiveKit is described as an open-source, code-first framework that gives engineers deeper control over agent behavior, audio processing, transcripts, tool workflows, transfers, and deployment, while requiring engineering resources and lacking some ready-made campaign products. The comparison also identifies LiveKit as broader in channel support, including current mobile SDKs, video, multi-party rooms, devices, robotics, and WhatsApp voice, whereas Retell and Vapi focus more heavily on phone-based contact-center interactions. Based on public September 2026 pricing assumptions, all three have similar platform costs at low usage, while LiveKit Cloud is estimated to become substantially less expensive at higher call volumes and can also be self-hosted without platform fees.

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