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Developer API
Deepgram
Developer voice AI platform with a unified Voice Agent API for building real-time conversational agents.
Developer API
Gradium
Low-latency text-to-speech, speech-to-text and speech translation APIs from the Kyutai research team.
Highlighted rows differ between these picks
| Attribute | Deepgram | Gradium |
|---|---|---|
| Platform type | Developer API | Developer API |
| Pricing | $0.075/min $4.50/hour ($0.075/min) for Voice Agent API | Subscription pricing Free; $13-$1,615/mo credit plans; Enterprise custom |
| Test it | Open live demo | Free trial |
| Calls | Inbound, Outbound | — |
| Human handoff | Yes | No |
| Setup difficulty | Technical | Technical |
| Use cases | Customer Support Appointment Scheduling Lead Qualification Order Taking | Custom Voice Apps Real Time Assistants Content Localization |
| Useful for |
|
|
| Integrations | ||
| WebSocket API | ||
| Custom API | — | |
| Function calling | — | |
| Twilio | — | |
| BYO LLM | — | |
| BYO TTS | — | |
| LiveKit | — | |
| Pipecat | — | |
| Vapi | — | |
| Python SDK | — | |
| +1 more across these tools — see each profile for the full list. | ||
Platform type
- Deepgram
- Developer API
- Gradium
- Developer API
Pricing
- Deepgram
$0.075/min
$4.50/hour ($0.075/min) for Voice Agent API
- Gradium
Subscription pricing
Free; $13-$1,615/mo credit plans; Enterprise custom
Test it
- Deepgram
- Open live demo
- Gradium
- Free trial
Calls
- Deepgram
- Inbound, Outbound
- Gradium
- —
Human handoff
- Deepgram
- Yes
- Gradium
- No
Setup difficulty
- Deepgram
- Technical
- Gradium
- Technical
Use cases
- Deepgram
- Customer SupportAppointment SchedulingLead QualificationOrder Taking
- Gradium
- Custom Voice AppsReal Time AssistantsContent Localization
Useful for
- Deepgram
- • Developer teams
- • Real-time voice agents
- • Enterprise voice infrastructure
- • Teams wanting a unified voice stack
- Gradium
- • European-language voice agents
- • EU data residency
- • Streaming TTS and STT from one vendor
- • Live speech translation
Integrations
| Deepgram | Gradium | |
|---|---|---|
| WebSocket API | ||
| Custom API | — | |
| Function calling | — | |
| Twilio | — | |
| BYO LLM | — | |
| BYO TTS | — | |
| LiveKit | — | |
| Pipecat | — | |
| Vapi | — | |
| Python SDK | — |
+1 more across these tools — see each profile for the full list.
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