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NextEVI: Voice AI for Developers

Build voice AI applications in minutes, not months. NextEVI provides everything you need to add intelligent voice conversations to your applications with just a few lines of code. 
import { useVoice } from '@nextevi/voice-react';

function VoiceChat() {
  const { connect, messages, isRecording } = useVoice();
  
  return (
    <div>
      <button onClick={() => connect({ 
        auth: { apiKey: "oak_key", configId: "config" } 
      })}>
        Start Voice Chat
      </button>
      {messages.map(msg => <div key={msg.id}>{msg.content}</div>)}
    </div>
  );
}

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Why Choose NextEVI?

5-Minute Integration

React SDK and WebSocket API - get voice AI running instantly

Emotion Intelligence

Real-time emotion detection for empathetic AI responses

Production Ready

Scalable infrastructure handling thousands of concurrent conversations

Developer First

Clean APIs, TypeScript support, comprehensive documentation

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Speech-to-Speech Voice AI

NextEVI’s Speech-to-Speech (EVI) enables natural, full-duplex voice conversations with advanced emotion recognition, turn detection, and seamless interruption handling. Key Features:
  • Real-time Processing: Sub-200ms latency for natural conversations
  • Emotion Detection: 9 emotions with confidence scoring
  • Turn Detection: Intelligent conversation flow with interruption handling
  • Multi-platform: React SDK and WebSocket API for any stack
  • TypeScript: Full type safety and IntelliSense support

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What You Can Build

Customer Support

Emotion-aware support bots with escalation detection

Voice Tutors

Adaptive learning with engagement tracking

Healthcare Assistants

Empathetic health monitoring and wellness tracking

Gaming Characters

Immersive NPCs with dynamic emotional responses

Accessibility Tools

Voice-first interfaces for inclusive experiences

Smart Assistants

Custom voice AI for any domain or use case

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Get Started in 5 Minutes

1

Get API Key

Sign up at NextEVI Dashboard and copy your API credentials
2

Install SDK

npm install @nextevi/voice-react
3

Add Voice Chat

const { connect, messages } = useVoice();
await connect({ auth: { apiKey: "oak_key", configId: "config" } });

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Choose Your Integration Path

5-Minute Quickstart

Complete voice chat app with working code

Speech-to-Speech Guide

Deep dive into voice AI capabilities

React SDK

Comprehensive React integration guide

WebSocket API

Direct WebSocket integration for any platform
Ready to build voice AI? Start with our 5-minute quickstart →