Hume AI
Free tierThe data and evaluation layer for emotionally intelligent voice AI
Free tier available·All audiences·API available
Key strengths
Emotionally intelligent voice AI evaluationExpression measurement across 48+ emotions and 50+ languages with 600+ output metricsHuman feedback at scale with pre-screened ratersAgent-to-agent and human-to-agent conversation simulation (Kairos)Voice AI leaderboards grounded in human judgmentReal-time expression measurement
Free tier + paid plans · from $3 USD/mo
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Hume AI is an open-source data and evaluation platform for developers building emotionally intelligent voice AI. It exposes an API layer covering expression measurement, conversation simulation, and human feedback collection — giving engineering teams the instrumentation needed to evaluate and iterate on voice AI systems with emotional fidelity.
Key technical capabilities include:
- Expression Measurement: 48+ emotions, 50+ languages, and 600+ output metrics for granular signal extraction from voice and multimodal inputs
- Empathic Voice Interface (EVI): Real-time expression measurement integrated into voice AI interactions
- Kairos Simulation: Agent-to-agent and human-to-agent conversation simulation for scalable, automated evaluation pipelines
- Human Feedback at Scale: Pre-screened rater panels for collecting ground-truth human judgment data
- Voice AI Leaderboards: Benchmarks grounded in human judgment for comparing model performance
- External LLM Integrations: Connect your own LLM backends into the evaluation and voice pipeline
The project is open source with 1,016 GitHub stars and offers a freemium pricing model. Usage-based overages apply for TTS characters and EVI minutes, with plans ranging from a free tier up to enterprise custom pricing.