Hume AI
Build voice AI that understands how people feel, not just what they say. EVI reads emotional tone in real time and responds with appropriate voice expression.
The verdict on Hume AI: Developers building voice applications where detecting emotional tone actually matters, not just words spoken Hume AI's Empathic Voice Interface is not a general-purpose TTS tool. Pricing: Voice Starter $3/month (USD) / Includes 40 EVI 3 minutes + 30,000 TTS characters/month / TTS non-commercial; no extra EVI overage.
Best For
Developers building voice applications where detecting emotional tone actually matters, not just words spoken
Standout Feature
The Empathic Voice Interface picks up pitch, pacing, and emotional valence, a layer no other voice API offers
TL;DR
A genuinely unique capability for the right use case, real overkill for a simple voice bot that doesn't need emotional nuance.
Alternatives
Fit Score: use-case reference
How this is scoredHume AI scored 1 to 5 on five dimensions for the named use cases below. Part of our catalog-wide use-case reference, not a product-quality review rating.
A developer building a voice application like a coaching tool or support agent where detecting emotional tone matters as much as the words spoken
3.6/5- Capability
- 5/5
- Reliability
- 3/5
- Value
- 4/5
- Ease
- 3/5
- Compatibility
- 3/5
Hume AI's Empathic Voice Interface picks up pitch, pacing, and emotional valence, which the tool's own take calls a layer no other voice API offers, built for applications where emotional tone matters as much as words.
A simple voice bot that doesn't require emotional nuance, especially outside English
2.2/5- Capability
- 2/5
- Reliability
- 2/5
- Value
- 2/5
- Ease
- 3/5
- Compatibility
- 2/5
Cons note emotional detection accuracy varies significantly across languages and call this overkill for simple voice bots that don't require emotional nuance.
Editorial judgment grounded in this tool's own published pricing, features, and our existing pros and cons, not a certification or a measured benchmark. Product quality is assessed separately under our review methodology.
Overview
Not yet reviewedProduct quality is assessed from original evidence. How reviews work.
Hume AI builds empathic voice intelligence: AI that detects emotional expression in speech and responds with appropriate emotional tone. The Empathic Voice Interface (EVI) is an API for building voice assistants that understand not just words but how they're said: pitch, pacing, tone, and emotional valence all inform the response. Used in mental health support apps, customer service, and any context where emotional nuance determines outcome quality.
For this EVI voice-app developer listing, the Starter voice plan costs $3/month in USD and includes 40 EVI 3 minutes plus 30,000 TTS characters each month. Starter TTS is non-commercial; additional TTS usage requires an upgrade, and additional EVI overage is unavailable on Starter. Higher plans and other voice models have separate allowances and rates.
Expression Measurement is a distinct API; its public numeric price was not established and is not represented by the Starter voice-plan price.
The source of the legacy catalog rating and review count has not been substantiated. Neither is presented here as a verified review rating or included in review structured data.
Workflow Fit Scores are separate, use-case-specific editorial judgments, not user-review averages. Read the Fit Score methodology.
- • Unique emotional intelligence layer no other voice API offers
- • EVI handles interruptions naturally, doesn't require explicit turn-taking
- • Expression Measurement API is standalone: works with any speech input
- • Emotional detection accuracy varies significantly across languages
- • Niche use cases: overkill for simple voice bots that don't require emotional nuance
- • Starter TTS is non-commercial; additional EVI usage requires a suitable higher plan
Key Features
- Empathic Voice Interface (EVI) with real-time emotion detection
- Expression Measurement API scoring 48 emotional dimensions from speech (separate API; public price not established)
- Responds with contextually appropriate emotional voice tone
- Interruption handling and natural conversation pacing
- Customizable voice persona and emotional range
- Multimodal input: combines speech tone with transcript for full context
Trust & Data
Verified 2026-09
- Training on your data
- Opt-out availableHume AI's own docs contain an internal contradiction: one page states that by default, data retention for its Empathic Voice Interface is enabled and user data may be used for model training, with an opt-out toggle in account settings, yet the same page also flatly states that for its API product, Hume AI will not use data submitted by customers via the API to train or improve its models. Since the voice interface is delivered via API, these two statements conflict and the vendor's docs do not reconcile them. For non-API consumer surfaces, content may be used to improve services by default with an opt-out. The general privacy policy explicitly says it does not govern content processed for business API customers, so it isn't the controlling document for the API training question either.
- Compliance
- HIPAA
- Retention
- Voice interface retention is enabled by default, storing chat transcripts and voice recordings; users can toggle a do-not-retain setting in their profile, which disables chat resume and history features. Non-content usage metadata is retained regardless.
- Export
- Not published
Sources: hume.ai, dev.hume.ai
As published by the vendor. Verify independently before purchase decisions.
Our Take
It's for developers building voice applications where the emotional tone of what someone says matters as much as the words, think mental health companions, coaching tools, or customer service agents that need to detect frustration or distress and respond accordingly. Starter is a $3/month voice plan including 40 EVI 3 minutes and 30,000 TTS characters per month, not unlimited pay-per-minute access. Its TTS is non-commercial and no additional EVI overage is available on Starter; budget a suitable higher plan and model for production. Emotional detection accuracy varies across languages, so non-English use cases deserve direct testing before any production commitment.