They are platforms for building conversational AI agents. Voiceflow is a design and deployment platform for chat and voice agents, with a visual builder, knowledge base support and integrations, which suits teams that want to design, test and iterate conversations collaboratively. Vapi and Retell focus on voice: they handle phone numbers, speech recognition, low-latency voice synthesis, interruptions and call transfer, so an AI agent can answer and make phone calls naturally. A typical build uses Voiceflow or custom logic for the conversation, Vapi or Retell for telephony, and API integrations to the CRM, calendar and knowledge base so the agent can qualify enquiries, book meetings, answer policy or booking questions and update records. The value comes from those integrations and from clear guardrails: what the agent may do, when it must hand over to a person and what gets logged. Hospitality, events, finance and insurance businesses use them for enquiries and reservations. AsymiLink Meta builds voice and chat agents on these platforms or custom, connected to your systems.