LiveKit Agents
Freemium
An open-source framework and cloud for building real-time voice and video AI agents.
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Retell AI
Voice Assistants
Paid
Build and deploy AI phone agents for support, scheduling and sales calls.
About Retell AI
Retell AI lets businesses build voice agents that talk on the phone like a person. It focuses on natural conversation, with quick responses and good handling of interruptions, and it connects with calendars and CRMs to take real actions.
You can design the agent in a visual builder or through code, test it with simulated calls and watch analytics after launch. It supports many languages and works with common telephony providers.
Retell uses pay as you go pricing per minute, with some free credits to start. It is popular for appointment booking, lead qualification and customer service lines.
Standout features
- Natural phone conversations
- Visual agent builder
- Calendar and CRM actions
- Simulated testing
- Call analytics
- Many languages
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