Grok Voice API vs Hume AI EVI
How the two platforms compare on pricing, live demos, calls, integrations, and setup — highlighted where they differ.
Developer API
Grok Voice API
Realtime speech-to-speech API on Grok Voice 3.0 for building voice agents, at $0.08 per minute, with SIP calls, tool use and OpenAI Realtime compatibility.
Voice Agent Platform
Hume AI EVI
Conversational voice platform focused on expressive speech, realtime interaction, and prosody-aware responses.
Highlighted rows differ between these picks
| Attribute | Grok Voice API | Hume AI EVI |
|---|---|---|
| Platform type | Developer API | Voice Agent Platform |
| Pricing | $0.08/min $0.08/min speech-to-speech; TTS $15/M characters; STT from $0.10/hour | $0.04-$0.07/min EVI $0.04-$0.07/min depending on plan; external services may add cost |
| Test it | Open live demo | Open live demo |
| Calls | Inbound | — |
| Human handoff | Yes | Yes |
| Setup difficulty | Technical | Technical |
| Use cases | Customer Support Lead Qualification Custom Voice Apps Telephony Agents | Custom Voice Apps Coaching Education Customer Experience |
| Useful for |
|
|
| Integrations | ||
| LiveKit | ||
| WebSocket | — | |
| SIP | — | |
| Twilio | — | |
| MCP | — | |
| Web and X search | — | |
| OpenAI Realtime clients | — | |
| Web SDK | — | |
| React | — | |
| API | — | |
| +2 more across these tools — see each profile for the full list. | ||
Platform type
- Grok Voice API
- Developer API
- Hume AI EVI
- Voice Agent Platform
Pricing
- Grok Voice API
$0.08/min
$0.08/min speech-to-speech; TTS $15/M characters; STT from $0.10/hour
- Hume AI EVI
$0.04-$0.07/min
EVI $0.04-$0.07/min depending on plan; external services may add cost
Test it
- Grok Voice API
- Open live demo
- Hume AI EVI
- Open live demo
Calls
- Grok Voice API
- Inbound
- Hume AI EVI
- —
Human handoff
- Grok Voice API
- Yes
- Hume AI EVI
- Yes
Setup difficulty
- Grok Voice API
- Technical
- Hume AI EVI
- Technical
Use cases
- Grok Voice API
- Customer SupportLead QualificationCustom Voice AppsTelephony Agents
- Hume AI EVI
- Custom Voice AppsCoachingEducationCustomer Experience
Useful for
- Grok Voice API
- • Developer teams building realtime voice agents
- • Teams moving off the OpenAI Realtime API
- • Agents that need live web or X search
- • One flat per-minute speech-to-speech price
- Hume AI EVI
- • Expressive voice experiences
- • Developer teams
- • Interactive applications
- • Custom web and mobile agents
Integrations
| Grok Voice API | Hume AI EVI | |
|---|---|---|
| LiveKit | ||
| WebSocket | — | |
| SIP | — | |
| Twilio | — | |
| MCP | — | |
| Web and X search | — | |
| OpenAI Realtime clients | — | |
| Web SDK | — | |
| React | — | |
| API | — |
+2 more across these tools — see each profile for the full list.
What would these cost to run?
Enter your call volume once and see Grok Voice API and Hume AI EVI priced at the same usage, ranked alongside every other platform.