Vocode

Vocode is an open-source, modular framework for building voice-based LLM agents that make and answer phone calls, act as assistants, or join meetings. The core is free to self-host, so you pay only the underlying LLM, speech, and telephony providers you plug in. A hosted API manages phone infrastructure for teams that prefer not to run it, priced on usage without a public rate table. It is aimed at developers wanting control and flexibility rather than a no-code product.

Vocode is a developer-focused, open-source toolkit for building voice agents on top of large language models. Its modular design lets you wire together speech-to-text, an LLM, text-to-speech, and telephony to create agents that answer or place phone calls, act as personal assistants, or even join meetings. Because it is open source, developers can inspect, extend, and fully control the stack. The economic model is straightforward: Vocode Core is free and self-hostable, and you pay only the underlying providers you plug in, such as your LLM, speech-to-text, text-to-speech, and telephony vendors. For teams that would rather not run infrastructure, Vocode also offers a hosted API that manages phone-call infrastructure, priced on usage, though it does not publish a simple public price table for that service. Vocode is best for engineers who want flexibility and control rather than a polished no-code product. It rewards technical teams comfortable assembling and operating a voice pipeline, and is less suitable for non-technical buyers who want an out-of-the-box, fully managed contact-center solution.