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 provides an API for integrating expression measurement, voice interaction, and evaluation workflows directly into your development pipeline. Core integration points include:
- Expression Measurement API: Extract 600+ metrics across 48+ emotions and 50+ languages from voice and multimodal data in real time
- EVI (Empathic Voice Interface): Real-time voice AI interface with built-in expression measurement
- Kairos: Simulation framework supporting agent-to-agent and human-to-agent conversation flows for automated evaluation
- Human Feedback API: Programmatically submit content for review by pre-screened human raters
- External LLM Integration: Connect external LLM providers to power or augment voice AI responses within the Hume pipeline
The platform is open source (1,016 GitHub stars) and follows a freemium model. Pricing tiers: Free ($0/mo), Starter ($3/mo), Creator ($7/mo, first month 50% off), Pro ($70/mo), Scale ($200/mo), Business ($500/mo), and Enterprise (custom). Usage-based overages apply for TTS characters and EVI minutes.