Hume AI

Hume AI is a voice AI platform that delivers text-to-speech and speech-to-speech capabilities through a developer API, with a distinguishing focus on emotional expression and tonal awareness in generated speech. The platform provides two core model families: Octave, which handles text-to-speech synthesis with support for multiple voice styles and expressive delivery modes, and EVI (Empathic Voice Interface), which powers real-time speech-to-speech conversations where the AI interprets emotional cues in spoken input and responds with contextually appropriate voice output. Developers can select model versions based on their requirements for output quality, response latency, and API cost. Commercial usage rights are included in all paid plans, and the platform supports external large language model integration, allowing teams to connect Hume AI's voice layer to their preferred LLM backend. Hume AI is used by developers building conversational AI agents that require emotionally nuanced spoken responses, by product teams integrating voice interaction into customer-facing applications, and by companies building call automation systems where monotone or robotic speech reduces user engagement. A typical integration involves connecting the Hume AI API to an application's dialogue management layer, selecting the appropriate EVI or Octave model based on use case requirements, and routing user speech input through the API for real-time response generation. See similar solutions. Voice cloning capabilities available on higher tiers allow organizations to create consistent branded voice identities for their applications. Team and organization features on Pro and above support multi-seat deployments and shared usage management. Hume AI's free plan provides limited monthly usage suitable for evaluation and small-scale prototyping. Paid plans begin at $3 per month (Starter) and scale through Creator ($7 or $14 per month depending on billing), Pro ($70 per month), Scale ($200 per month), and Business ($500 per month), with usage-based charges applying for consumption beyond plan-included limits. Enterprise pricing is available from Hume AI directly for organizations with high request volumes or custom deployment requirements. Teams whose primary requirement is basic text-to-speech without emotional expression capabilities may find purpose-built TTS tools more cost-efficient than paying for Hume AI's full emotionally aware stack Read our guide.