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Voice Agent Platform
Smallest AI
Voice agent platform built on Smallest AI's own speech-to-text, text-to-speech and small language models.
Developer API
Vapi
Developer-oriented voice agent platform for building phone agents with custom workflows and integrations.
Highlighted rows differ between these picks
| Attribute | Smallest AI | Vapi |
|---|---|---|
| Platform type | Voice Agent Platform | Developer API |
| Pricing | $0.10-$0.22/min Pay as you go $0.09-$0.21/min plus $0.01/min hosting; Enterprise from $0.05/min | $0.13-$0.33/min $0.05/min hosting + provider costs |
| Test it | Free trial | Free trial |
| Calls | Inbound, Outbound | Inbound, Outbound |
| Human handoff | No | Yes |
| Setup difficulty | Medium | Technical |
| Use cases | Customer Support Outbound Calling Lead Qualification Custom Voice Apps | Customer Support Appointment Scheduling Lead Qualification Outbound Calling |
| Useful for |
|
|
| Integrations | ||
| Plivo | — | |
| Vonage | — | |
| Twilio SIP | — | |
| Telnyx SIP | — | |
| LiveKit | — | |
| Pipecat | — | |
| n8n | — | |
| Twilio | — | |
| Zapier | — | |
| Custom API | — | |
| +2 more across these tools — see each profile for the full list. | ||
Platform type
- Smallest AI
- Voice Agent Platform
- Vapi
- Developer API
Pricing
- Smallest AI
$0.10-$0.22/min
Pay as you go $0.09-$0.21/min plus $0.01/min hosting; Enterprise from $0.05/min
- Vapi
$0.13-$0.33/min
$0.05/min hosting + provider costs
Test it
- Smallest AI
- Free trial
- Vapi
- Free trial
Calls
- Smallest AI
- Inbound, Outbound
- Vapi
- Inbound, Outbound
Human handoff
- Smallest AI
- No
- Vapi
- Yes
Setup difficulty
- Smallest AI
- Medium
- Vapi
- Technical
Use cases
- Smallest AI
- Customer SupportOutbound CallingLead QualificationCustom Voice Apps
- Vapi
- Customer SupportAppointment SchedulingLead QualificationOutbound Calling
Useful for
- Smallest AI
- • Low-latency phone agents
- • One vendor for speech models and agent hosting
- • Multilingual text-to-speech
- • Outbound campaigns
- Vapi
- • Developer teams
- • Custom call workflows
- • Voice AI prototypes
Integrations
| Smallest AI | Vapi | |
|---|---|---|
| Plivo | — | |
| Vonage | — | |
| Twilio SIP | — | |
| Telnyx SIP | — | |
| LiveKit | — | |
| Pipecat | — | |
| n8n | — | |
| Twilio | — | |
| Zapier | — | |
| Custom 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 Smallest AI and Vapi priced at the same usage, ranked alongside every other platform.