Retell is a developer-first API for building ultra-low-latency, human-like conversational voice agents, enabling businesses to create sophisticated voice bots that can handle complex interactions with natural-sounding speech.
Retell AI provides a specialized API for developers to construct highly responsive, conversational voice agents. The platform's core focus is on minimizing latency to sub-100ms, creating a more natural and human-like interaction flow that traditional voice bots often lack. It serves businesses and developers who need to integrate sophisticated voice automation into their products, such as for customer service, sales outreach, or in-app assistants. Retell's unique value proposition lies in its model-agnostic architecture, which allows developers to plug in their preferred large language models (LLM), speech-to-text (STT), and text-to-speech (TTS) engines. By managing the complex telephony and real-time streaming infrastructure, Retell enables developers to focus on crafting the conversational logic rather than the underlying plumbing.
Developers, product managers, and businesses seeking to build and integrate advanced, low-latency voice AI capabilities into their applications for customer support, sales, or user engagement.
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2023
San Francisco, USA
Free
60 free minutes per month, 1 concurrent call, access to beta features, and community support. Ideal for hobbyists and initial development.
Free
Starter
120 free minutes per month, up to 10 concurrent calls, and standard support. Usage fees apply per minute for agent model and telephony.
$10/mo + usage
Enterprise
Custom concurrent calls, custom minutes, dedicated support, custom data retention policies, and optional on-premise deployment.
Custom
Vapi is a direct competitor also offering a developer-first API for building low-latency voice AI agents, often chosen for its similar feature set and developer experience.
Twilio is an established CPaaS giant that provides broader telephony tools, which someone might choose for its vast ecosystem, though it requires more assembly to achieve what Retell offers out-of-the-box.
Bland AI is a close alternative focused on simplifying the process of creating and deploying voice agents for automating phone calls, appealing to those who prioritize speed of deployment.
Primarily an STT/TTS provider, Deepgram's Aura platform lets you build voice agents, which is a good choice if you prefer a solution from a single, vertically integrated speech AI vendor.
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