Retell AI

Retell AI is a web and API platform for businesses and enterprises to build, test, deploy, and monitor production voice agents that automate inbound and outbound phone calls, plus SMS and chat.

Key capabilities include:

• Low-latency, human-like conversations (about 600 to 800 ms) with intelligent turn-taking and interruption handling for natural call flows.
• Action-taking agents via real-time function calling, enabling workflows such as booking appointments, qualifying leads, updating records, processing payments, navigating IVR, and warm transfers with context.
• Scale and reach with batch calling, high concurrency (up to millions of concurrent calls), dialing to any country, and 31+ languages, backed by a stated 99.99% uptime.
• Integrations and telephony flexibility through webhooks, CRM connectivity, and SIP trunking to connect existing numbers and providers (also supports providers such as Twilio and Vonage).
• Testing and monitoring with built-in simulation testing, post-call analysis, transcription, sentiment scoring, and analytics dashboards.

Pricing: Pay as you go and Enterprise plans.

Notable for combining enterprise compliance (SOC 2 Type 1 and 2, HIPAA, GDPR) with developer and no-code tooling, plus infrastructure designed for large-scale voice automation across sales, support, healthcare, and financial services.