Retell AI
Developer platform for low-latency AI voice agents that handle real phone calls
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www.retellai.comAbout Retell AI
Retell AI is a developer platform for building and deploying AI voice agents that handle real phone calls in natural, spoken conversation. Rather than a rigid IVR menu, a Retell agent listens, responds with low latency, handles interruptions like a human, and can take actions mid-call by hitting a company's APIs — looking up an order, booking an appointment, or updating a CRM. The platform is model-flexible: teams choose the LLM that drives reasoning (GPT, Claude, and others) and the voice provider that shapes how the agent sounds (including ElevenLabs), balancing realism against cost. Telephony is built in, supporting both inbound lines (support, reception) and outbound campaigns (reminders, lead follow-up, surveys). Retell serves both non-developers through a no-code agent builder and engineers through a full API and SDKs with function calling. Pricing is usage-based, billed roughly per minute on top of LLM and voice costs, with post-call transcripts, recordings, and structured analytics for measuring and improving agents.
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Studio-grade AI voices and speech-to-text — the voice layer most teams pair with tools like this.
Key Features
Retell AI Pros & Cons
✅ Pros
- +Natural, low-latency conversations with graceful interruption handling
- +Both no-code and API paths cover non-developers and engineering teams
- +Model-flexible — pick the LLM and voice provider per agent
- +Handles inbound and outbound calling on the same platform
- +Function calling lets agents look up orders, book appointments, and update a CRM mid-call
- +Pay-per-minute pricing scales from prototype to production without a big upfront commitment
⚠️ Cons
- −Production-grade agents with integrations generally still need engineering effort
- −Per-minute platform cost stacks with LLM token and voice-provider costs
- −Voice realism depends heavily on which provider is selected
- −Telephony compliance (consent, TCPA for outbound) is the customer's responsibility
- −Smaller ecosystem than legacy contact-center platforms
Who Is Retell AI Best For?
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