Empathic Voice Interface (EVI) - AI Conversations with Emotional Intelligence | Hume AI
Product Empathic Voice Interface
Conversational AI with emotional intelligence
Build voice-first AI experiences that understand and respond to human emotions. Natural, empathic conversations at scale.
Bring your own LLM
Use any language model you want. EVI works seamlessly with Claude, GPT, Gemini, Grok, Kimi K2, Llama, and more. Switch models without changing your integration.
Your voice, your way
Choose from a curated library of expressive voices, clone any voice from a sample, or design entirely new voices from natural language descriptions. Create the perfect voice for your brand.
Vince Douglas
The speaker has a reflective, Black American voice, reminiscent of a Harlem storyteller sharing nostalgic memories with a tone of resilience and quiet strength.
Mysterious Woman
A smooth, breathy, rich, resonant, and elegantly poised voice, conveying authority with a captivating warmth and sophisticated precision.
Male English Actor
The speaker has a confident, charismatic tone, like a tech guru explaining a new technology with infectious enthusiasm, and the excitement of a viral storyteller.
Inspiring Woman
An inspiring female voice with a soft, welcoming, prophetic tone.
Campfire Narrator
Previously Texan Narrator. The best, most amazing and famous audiobook narrator ever, with the richest and warmest and most inviting voice.
TikTok Fashion Influencer
Tiktok fashion influencer with deep, rich, soothing voice.
Colton Rivers
Previously Charming Cowboy. A grizzled old cowboy with a folksy Texan drawl Southern accent, speaking in a charismatic tone with a deep but relaxed vibe.
Inspiring Man
An inspiring male voice with a soft, welcoming, prophetic tone.
Terrence Bentley
A middle-aged African American man, reminiscing with a slightly gravelly voice and a tone of hard-earned wisdom.
Alice Bennett
A sophisticated British female narrator with a gentle, warm voice, recounting the ending of a classic romance novel.
Sitcom Girl
The star of a popular sitcom, with frequent inner monologues about her life.
Unserious Movie Trailer Narrator
An American, deep middle-aged male film trailer narrator for a film about chickens.
Big Dicky
The speaker has a booming, charismatic radio voice, like a Texan fishing guru with a hint of gravel and an infectious laugh, perfect for reeling in listeners to "Big Dicky's live fishing frenzy."
English Children's Book Narrator
British Children's Storybook Narrator with a deep, rich, amazing, warm, inviting voice.
Spanish Instructor
The speaker has a Mexican accent.
Fastidious Robo-Butler
The speaker is a fussy yet ultimately kindhearted droid with a precise received pronunciation accent and a slightly nasal tone.
Ito
A male adult voice made famous by EVI 1 and 2.
Kora
A female adult voice made famous by EVI 1 and 2.
Real-time streaming
Start playback in milliseconds with streaming audio output. EVI begins generating speech instantly, streaming audio chunks as they're ready. Perfect for real-time applications where every millisecond counts.
~300ms Time to first byte
Features
Everything you need for voice AI
Interruptibility
Users can interrupt at any time, just like real conversations.
Pause responses
Programmatically pause and resume responses at any moment.
Resume chats
Pick up conversations right where they left off with full context.
Chat history
Access complete transcripts with timestamps and emotion data.
Dynamic variables
Inject real-time data like user names, account info, and prices.
Context injection
Add context mid-conversation for RAG and knowledge bases.
Tool use
Connect to your APIs for appointments, orders, and more.
Audio reconstruction
Reconstruct complete audio from any conversation on demand.
For Developers
Build voice experiences in minutes
Integrate EVI into your application with just a few lines of code. Full SDK support for React, TypeScript, Python, .NET, Swift, and more.
import { HumeClient } from 'hume';
const client = new HumeClient({ apiKey: 'YOUR_API_KEY' });
client.empathicVoice.chat.connect({
configId: 'YOUR_CONFIG_ID',
});
Case Studies
See what others are building
Niantic Spatial × Hume AI: Creating Interactive & Spatially Aware AI Companions
In partnership with Snap Inc. (hardware) and Hume AI (voice), Niantic Spatial has developed location-aware companions for Spectacles, blending Snap Inc.’s AR glasses, Niantic Spatial’s Large Geospatial Model, and Hume’s Empathic Voice Interface (EVI) for natural, emotionally intelligent conversation.
GAF Powers Professional Training with Hume’s Text-to-Speech
To support their extensive training programs and marketing initiatives, GAF leverages Hume's text-to-speech technology to make internal training videos and marketing voiceovers.
Hume AI powers conversational learning with Coconote
While traditional note-taking apps require students to manually scroll and search through content, Coconote is creating interactive study experiences through conversational AI.
Enterprise Ready
Built for business
FAQ
Frequently asked questions
What is EVI?
EVI (Empathic Voice Interface) is Hume's voice AI that understands and responds to human emotions in real-time. It combines speech recognition, emotion detection, and natural language processing to create more natural, empathic conversations.