Answer the phone with AI

Leader agents that book, route, and resolve calls around the clock, in a voice customers do not hang up on.

Production AI phone stack

Individual products and alternatives (12)

Twilio

Connect telephony

Twilio is a cloud communications platform that provides APIs for SMS, voice, video, email, and WhatsApp messaging. It enables developers to embed communication capabilities into applications and power…

SignalWire

Connect telephony

Elastic communications platform with voice, video, messaging, and SIP.

Vonage

Connect telephony

Vonage, an Ericsson company, provides cloud communications APIs and unified communications solutions enabling businesses to embed voice, video, messaging, and authentication into applications.

Vapi

Run the voice agent

Vapi is a developer platform for building, testing, and deploying voice AI agents that can handle phone calls with natural conversation capabilities and tool integrations.

Retell

Run the voice agent

Voice AI API for building production phone call agents with low latency.

Bland AI

Run the voice agent

Bland AI provides infrastructure for making and receiving AI-powered phone calls at enterprise scale, handling customer service, lead qualification, and appointment scheduling.

ElevenLabs

Generate natural speech

ElevenLabs is an AI audio platform that provides lifelike text-to-speech, voice cloning, dubbing, and sound effects generation for content creators and enterprises.

PlayHT

Generate natural speech

PlayHT offers text-to-speech and voice generation infrastructure for products, media workflows, and conversational AI applications.

Cartesia

Generate natural speech

Cartesia builds voice model infrastructure focused on real-time performance for conversational interfaces and AI voice products.

AssemblyAI

Transcribe and review

AssemblyAI provides speech-to-text, real-time transcription, and voice intelligence models for teams shipping voice AI and audio-driven workflows.

Deepgram

Transcribe and review

Deepgram provides speech-to-text and voice understanding APIs for teams building transcription, voice workflows, and AI-powered audio products.

CallMiner

Transcribe and review

CallMiner provides AI-powered conversation analytics that analyzes customer interactions across calls, chat, email, and social for insights.