Hero vs. Retell AI

Vivun's AI Sales Teammate, Hero, works alongside sellers before, during, and after customer conversations, helping them prepare with the right context, respond confidently in real time, and preserve momentum through immediate follow-through. Every deal comes down to a handful of critical moments. A question you didn't anticipate. A conversation that shifts direction. A follow-up that can't wait. Vivun shows up inside those moments, not after them, so sellers can perform when the outcome is still undecided.

Retell AI is a powerful conversational AI platform designed to automate voice, SMS, and chat interactions with natural, humanlike performance. Built on top of your choice of large language models (LLMs), Retell allows teams to spin up real-time AI agents that handle calls, trigger messaging workflows, and integrate seamlessly into your existing systems—all without writing code. At its core, Retell delivers Voice Agent Automation that feels indistinguishable from speaking with a real person.