Retell

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voice web, telephony paid closed source
voice-ai phone-agents real-time-voice call-automation API

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Added 02-16-2026

Retell AI is a real-time voice agent platform built for businesses that need phone calls handled instantly without the robotic lag. With industry-leading 600ms response times, it actually sounds like you're talking to a human who knows when to shut up and listen. Perfect for teams ditching expensive call centers for AI that can book appointments, answer support tickets, and qualify leads at scale without putting anyone on hold.

Key Features

  • Lightning fast 600ms responses that feel genuinely human
  • No-code builder launches agents in days not months
  • Handles interruptions like a patient human would naturally
  • Connects to any phone system without rewiring infrastructure
  • Real-time function calling books appointments while you chat

Use Cases

  • Customer support that never sleeps or needs breaks
  • Appointment scheduling without endless phone tag
  • Lead qualification that scales without hiring salespeople
  • Medical offices handling patient calls minus the hold music
  • E-commerce support from browse to checkout questions instantly

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