Hume AI

Hume AI builds voice AI that understands human emotional expression. Its Empathic Voice Interface (EVI) analyzes prosody (tone, rhythm, pitch) to infer emotional states and responds with naturalistic, empathic speech in under 300ms. Also offers Octave for instructable text-to-speech, an Expression Measurement API for analyzing emotion in face, voice, and language, and Creator Studio for converting documents to audio. Supports 11 languages. Free tier includes 10,000 characters per month.