Tools
Empathic Voice Interface (EVI) vs Octave
Empathic Voice Interface (EVI) or Octave? Their plans monthly and yearly, the capabilities their makers state, security and latest updates, side by side — read from the makers' own pages.
In inglese
In short
- Both: Text to speech, Voice cloning, API
- Only Empathic Voice Interface (EVI) states: Speech to text
- Only Octave states: Many languages
Empathic Voice Interface (EVI)
EVI is Hume's real-time voice AI for building conversations that respond to vocal expression and emotional context.
Plans
Free
Free
- 10,000 monthly included characters
- 5 minutes monthly EVI usage included
- 15 requests per minute
- 1 concurrent connection
- Unlimited voice cloning (create and use)
Starter
- $3 / month
- 30,000 monthly included characters
- 40 minutes monthly EVI usage included
- 15 requests per minute
- 5 concurrent connections
- Unlimited voice cloning (create and use)
Creator
- $14 / month
- 140,000 monthly included characters
- 200 minutes monthly EVI usage included
- 75 requests per minute
- 5 concurrent connections
- Unlimited voice cloning (create and use)
Pro
- $70 / month
- 1,000,000 monthly included characters
- 1,200 minutes monthly EVI usage included
- 75 requests per minute
- 10 concurrent connections
- Unlimited voice cloning (create and use)
Scale
- $200 / month
- 3,300,000 monthly included characters
- 5,000 minutes monthly EVI usage included
- 150 requests per minute
- 20 concurrent connections
- 3 team seats
- Unlimited voice cloning (create and use)
Business
- $500 / month
- 10,000,000 monthly included characters
- 12,500 minutes monthly EVI usage included
- 225 requests per minute
- 30 concurrent connections
- 5 team seats
- Unlimited voice cloning (create and use)
Enterprise
Price on request
- As much monthly included characters as you need
- As much monthly EVI usage as you need
- As many concurrent connections as you need
- Unlimited voice cloning (create, use and access via API)
- Unlimited team seats
- Slack support
Prices checked 2026-09-25 on the maker’s page.
Capabilities
- Text to speech — “EVI begins generating speech instantly, streaming audio chunks as they're ready.” source
- Voice cloning — “Choose from a curated library of expressive voices, clone any voice from a sample, or design entirely new voices from natural language descriptions.” source
- Speech to text — “Access complete transcripts with timestamps and emotion data.” source
- API — “Get started in minutes with our intuitive API” source
Latest updates
- EVI API additions
Added configurable turn detection and interruption settings to EVI configs.
- EVI API additions
Added support for new supplemental LLM models and zero prompt expansion.
- EVI API additions
Added support for a new SESSION_SETTINGS chat event in the EVI chat history API.
Octave
Octave is Hume's text-to-speech API for expressive speech, custom voices, emotional delivery, and real-time audio streaming.
Plans
Free
Free
- 10,000 monthly included characters
- 5 minutes of monthly EVI usage included
- 15 requests per minute
- 1 concurrent connection
- Unlimited voice cloning (create and use)
Starter
- $3 / month
- 30,000 monthly included characters
- 40 minutes of monthly EVI usage included
- 5 concurrent connections
- Unlimited voice cloning (create and use)
Creator
- $14 / month
- 140,000 monthly included characters
- 200 minutes of monthly EVI usage included
- 75 requests per minute
- 5 concurrent connections
- Unlimited voice cloning (create and use)
Pro
- $70 / month
- 1,000,000 monthly included characters
- 1,200 minutes of monthly EVI usage included
- 10 concurrent connections
- Unlimited voice cloning (create and use)
Scale
- $200 / month
- 3,300,000 monthly included characters
- 5,000 minutes of monthly EVI usage included
- 20 concurrent connections
- 3 team seats
- Unlimited voice cloning (create and use)
Business
- $500 / month
- 10,000,000 monthly included characters
- 12,500 minutes of monthly EVI usage included
- 30 concurrent connections
- 5 team seats
- Unlimited voice cloning (create and use)
Enterprise
Price on request
- As much text-to-speech usage as you need
- As much EVI usage as you need
- As many concurrent connections as you need
- Unlimited team seats
- Unlimited voice cloning (create, use and access via API)
- Slack support
Prices checked 2026-09-25 on the maker’s page.
Capabilities
- Text to speech — “Generate expressive, natural-sounding speech that conveys the full range of human emotion.” source
- Voice cloning — “Choose from a curated library of expressive voices, clone any voice from a sample, or design entirely new voices from natural language descriptions.” source
- Many languages — “Native-quality speech in 16+ languages with authentic accents.” source
- API — “Octave is Hume's text-to-speech API with emotional intelligence.” source
Latest updates
- Octave 2: next-generation multilingual voice AI (Octave 2)
Launching Octave 2 for text-to-speech in 11 languages and EVI 4 mini for the speech-to-speech API.