What is Hume AI?
Hume AI is a voice AI platform that lets developers build voice-powered apps with emotional intelligence. It covers two products: Octave for text-to-speech and EVI for conversational AI. The AI models handle expressive speech generation and real-time emotional conversation at scale. You can access it through an SDK, API, or an interactive playground for testing.
Besides the AI voice platform, Hume also as an AI assistant app available for iOS.
Features & Benefits
- Text-to-Speech — Generate expressive, natural-sounding speech from written text with a full emotional range using the voice AI platform.
- Conversational Voice AI — Build real-time voice agents that detect and respond to human emotion during live calls.
- External LLM Support — Connect the voice AI platform to any external language model, including Claude, GPT, Gemini, and Llama.
- SDK Support — Integrate the voice AI platform using Python, TypeScript, React, .NET, Swift, and more.
- API Access — Access the voice AI platform programmatically to integrate speech and conversational AI into any application.
- Real-Time Streaming — Start audio playback in around 300 milliseconds with chunked streaming output.
- Tool Use — Connect to external APIs to handle appointments, orders, and other live actions during calls.
- Dynamic Variables — Inject live data like user names, account details, or pricing into conversations in real time.
- Context Injection — Add knowledge base or RAG context mid-conversation without restarting the session.
- Word and Phoneme Timestamps — Get precise timing data for lip sync, captions, and text highlighting.
- Expression Measurement — Analyze facial expressions, speech prosody, vocal bursts, and emotional language from video, audio, images, or text.
- Audio Reconstruction — Rebuild complete audio from any past conversation on demand.
- Multiple Audio Formats — Export speech as MP3, WAV, OGG, FLAC, or raw PCM.
- Voice Cloning — Clone any voice from a sample or design entirely new voices from natural language descriptions.
- Voice Library — Choose from a curated set of expressive voice presets to match any brand or use case.
- Acting Instructions — Direct tone, pacing, emphasis, and mood on every line using plain natural language.
- Multilingual Support — Produce native-quality speech in 16 or more languages with authentic accents.
- Speed Control — Adjust speaking rate from 0.25x to 4x for any content type.
- Audio Normalization — Keep volume levels consistent across all generated audio.
- Contextual Continuation — Maintain natural flow across sequential requests with smart heteronym disambiguation.
- Interruptibility — Let users cut in mid-response, matching the natural rhythm of real conversation.
- Pause Responses — Programmatically pause and resume responses at any point during a conversation.
- Chat History — Access full conversation transcripts with timestamps and emotion data attached.
- Resume Chats — Pick up any prior conversation with full context intact.
- Team Collaboration — Organize projects across multiple seats with shared workspace support.
Real-World Applications
Podcast production teams can use the voice AI platform to generate consistent host narration across episodes. Octave’s acting instructions let producers control tone and pacing line by line. Voice cloning keeps a brand voice identical across hundreds of hours of content.
Customer service teams can deploy EVI as a live voice agent that picks up on emotional cues mid-call. The voice AI platform handles interruptions naturally and pulls in live account data through dynamic variables. That keeps interactions feeling responsive rather than scripted.
Language learning apps may find strong value in the voice AI platform’s multilingual output and expressive delivery. Native-quality speech in 16 or more languages gives learners accurate pronunciation models. Acting instructions can shift register from formal instruction to casual conversation as needed.
Developers building game or interactive fiction apps can use the voice AI platform to voice characters with real emotional depth. Each character can carry a distinct cloned or designed voice. Real-time streaming at around 300 milliseconds keeps dialogue timed tightly to in-game events.
