Hume is a voice AI platform developed by Hume AI. It offers “EVI,” a conversational model that reads emotional cues from a speaker’s tone and rhythm to respond with an empathic voice, and “Octave,” a speech generation model for high-quality text-to-speech and voice cloning. It supports over 100,000 custom voices and can be combined with major LLMs such as Claude and Gemini. Developer APIs and SDKs for Python, TypeScript, and React are well maintained, making it easy to embed into applications such as voice assistants, customer support, and narration generation. In 2025, EVI 3 and the multilingual next-generation TTS model “Octave 2” arrived, significantly improving response speed and expressiveness.
Key Features
- Emotion-aware conversational AI “EVI”: Analyzes emotional cues from the speaker’s tone, rhythm, and intonation, and responds in a voice with an empathic tone that fits the context. EVI 3 achieves low-latency responses under 300 milliseconds
- Expressive TTS “Octave”: A speech generation model that understands the meaning of the text and adjusts how it reads. Octave 2, announced in October 2025, supports 11 languages and generates audio 40% faster than before (under 200 milliseconds)
- Over 100,000 custom voices: In addition to a rich voice library, you can design new voices from prompts or reproduce a specific voice with voice cloning
- Integration with major LLMs: You can specify external LLMs such as Claude or Gemini as the “brain” of EVI’s conversations, designing dialogues tailored to your use case
- Well-equipped developer SDKs: Provides SDKs for Python, TypeScript, and React along with REST/WebSocket APIs. Embedding voice into your app can start with just a few lines of code
- Voice conversion and phoneme editing: Octave 2 also offers fine-grained controls for audio production, such as voice conversion and phoneme-level pronunciation editing
Pricing
| Plan | Monthly Price | Highlights |
|---|---|---|
| Free | $0 | 10,000 TTS characters (about 10 minutes), 5 EVI minutes, 1 concurrent connection |
| Starter | $3 | 30,000 TTS characters, 40 EVI minutes, 5 concurrent connections |
| Creator | $7 | 140,000 TTS characters, 200 EVI minutes, 5 concurrent connections |
| Pro | $70 | 1,000,000 TTS characters, 1,200 EVI minutes, 10 concurrent connections |
| Scale | $200 | 3,300,000 TTS characters, 5,000 EVI minutes, 3 team seats |
| Business | $500 | 10,000,000 TTS characters, 12,500 EVI minutes, 5 team seats |
| Enterprise | Contact sales | Unlimited usage, SOC 2 Type II/GDPR/HIPAA compliance, Slack support |
Pricing is as of August 2026. Please check the official site for the latest pricing.
Pros & Cons
✅ Pros
- Handling emotion recognition and speech generation on a single platform is unique, making it easier to build empathic voice experiences
- Both EVI 3 and Octave 2 respond quickly (under 200-300 milliseconds), which is fast enough for real-time conversation
- A free plan and low-cost plans starting at $3/month make it easy for individual developers to try
- Well-maintained SDKs and documentation shorten the path to a working prototype
- The swappable-LLM design makes it easy to combine with your existing AI stack
⚠️ Cons
- Multilingual support, including Japanese, is progressing, but examples and information are scarcer than for English
- Usage-based billing means large-scale deployments require careful cost estimation
- It is not a general-purpose tool that works entirely in a chat UI; using it generally assumes development (API integration)
- Emotion recognition accuracy depends on speaking style and audio quality and is not always precise
Comparison with Similar Services
| Comparison | Hume | ElevenLabs | Cartesia | OpenAI (audio APIs) |
|---|---|---|---|---|
| Main use | Emotion-aware voice dialogue and TTS | TTS and voice cloning | Low-latency TTS and voice agents | Voice dialogue, TTS, transcription |
| Emotion recognition | Core feature (EVI) | Limited | Limited | Limited |
| Voice cloning | Supported | Supported (known for quality) | Supported | Not supported (preset voices) |
| Conversational agents | EVI (integrated, speed-focused) | Agents Platform available | Available | Realtime API available |
| Free tier | Yes | Yes | Yes | No (pay-as-you-go) |
Who Is It For
- Developers building emotion-aware voice dialogue apps such as voice assistants or AI call centers
- Creators who want expressive, context-aware narration for audiobooks and voiceovers
- Teams that want to add a “voice” layer to an existing LLM stack such as Claude or Gemini
- Individual developers who want to test the capabilities of voice AI starting with the free tier or a few dollars a month
Summary
Hume stands apart from other voice AI platforms by placing “reading emotion” at its core. It lets you handle empathic real-time dialogue through EVI and expressive speech generation through Octave with a single set of APIs, with pricing tiers starting from free. Using it assumes some development work, but for products that care about the quality of the voice experience, it is a strong candidate.