Vapi

Build, test, and deploy AI voice agents for phone calls.

A no-code platform for humanlike voice agents that handle inbound and outbound phone calls — receptionists, IVR, and outbound campaigns. It bundles telephony (SIP / Twilio), a proprietary turn-taking model for low-latency conversations, prompts, tools, and call analytics. Pay-as-you-go pricing with free starter credits.

Enterprise voice AI platform for automated phone calls.

An enterprise platform for building AI agents that handle inbound and outbound phone calls 24/7 with natural, real-time conversation. Bland bundles the language model, speech-to-text, text-to-speech, and telephony into a single per-minute rate, and integrates with tools like Twilio, Salesforce, HubSpot, and Zapier. Build agents in a web dashboard or via a REST API; a free tier lets you start before moving to usage-based paid tiers.

Text-to-speech, voice cloning, and multilingual dubbing.

Hosted speech synthesis at near-human quality — TTS, voice cloning, multilingual dubbing, and conversational voice agents. Default choice when you need a voice that sounds like a person, not a robot.

Low-latency streaming text-to-speech for real-time voice.

Streaming-first speech synthesis built around the Sonic family of state-space models. Aims at real-time agent voices where latency between turns is the product. Strong choice for sub-200ms voice loops.