Twilio

WhatsApp is a cross-platform messaging and voice/video calling application owned by Meta Platforms. It provides text messaging, group chats, voice and video calls, file sharing, and end-to-end encryption for communications. The service is available on iOS, Android, Windows, macOS and via a web client.

AssemblyAI's Voice Agent API is an API for building real-time voice agents. It connects speech-to-text, an LLM, and text-to-speech through a single WebSocket, with built-in turn detection and interruption handling.

Vapi is a developer platform for building, testing, and deploying conversational voice AI agents. It provides a cascaded voice-agent architecture and supports customer-supplied text-to-speech servers for specialized applications.

SendGrid is an email API and email marketing campaigns platform from Twilio. It sends transactional messages such as waiver copies and organizer alert emails.

Symphony by Wix is an AI agent platform for businesses that assembles a team of specialist agents from a plain-English conversation. It asks clarifying questions, creates a workspace called a space, assigns agents named roles, and runs tasks in parallel. The agents can handle activities such as pricing research, social-media posts, lead inquiry forms, Google Business Profile guidance, calendar automations, and advertising materials.