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Voice Agent Platform
Retell AI
Voice AI platform for building low-latency phone agents across support, scheduling, and sales workflows.
Voice Agent Platform
Smallest AI
Voice agent platform built on Smallest AI's own speech-to-text, text-to-speech and small language models.
Highlighted rows differ between these picks
| Attribute | Retell AI | Smallest AI |
|---|---|---|
| Platform type | Voice Agent Platform | Voice Agent Platform |
| Pricing | $0.07-$0.31/min $0.07-$0.31/min; custom pricing available | $0.10-$0.22/min Pay as you go $0.09-$0.21/min plus $0.01/min hosting; Enterprise from $0.05/min |
| Test it | Free trial | Free trial |
| Calls | Inbound, Outbound | Inbound, Outbound |
| Human handoff | Yes | No |
| Setup difficulty | Medium | Medium |
| Use cases | Customer Support Appointment Scheduling Lead Qualification AI Receptionists | Customer Support Outbound Calling Lead Qualification Custom Voice Apps |
| Useful for |
|
|
| Integrations | ||
| Twilio | — | |
| Custom API | — | |
| Zapier | — | |
| CRM | — | |
| Calendar | — | |
| Plivo | — | |
| Vonage | — | |
| Twilio SIP | — | |
| Telnyx SIP | — | |
| LiveKit | — | |
| +2 more across these tools — see each profile for the full list. | ||
Platform type
- Retell AI
- Voice Agent Platform
- Smallest AI
- Voice Agent Platform
Pricing
- Retell AI
$0.07-$0.31/min
$0.07-$0.31/min; custom pricing available
- 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
Test it
- Retell AI
- Free trial
- Smallest AI
- Free trial
Calls
- Retell AI
- Inbound, Outbound
- Smallest AI
- Inbound, Outbound
Human handoff
- Retell AI
- Yes
- Smallest AI
- No
Setup difficulty
- Retell AI
- Medium
- Smallest AI
- Medium
Use cases
- Retell AI
- Customer SupportAppointment SchedulingLead QualificationAI Receptionists
- Smallest AI
- Customer SupportOutbound CallingLead QualificationCustom Voice Apps
Useful for
- Retell AI
- • Fast voice prototypes
- • Support call automation
- • Scheduling workflows
- Smallest AI
- • Low-latency phone agents
- • One vendor for speech models and agent hosting
- • Multilingual text-to-speech
- • Outbound campaigns
Integrations
| Retell AI | Smallest AI | |
|---|---|---|
| Twilio | — | |
| Custom API | — | |
| Zapier | — | |
| CRM | — | |
| Calendar | — | |
| Plivo | — | |
| Vonage | — | |
| Twilio SIP | — | |
| Telnyx SIP | — | |
| LiveKit | — |
+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 Retell AI and Smallest AI priced at the same usage, ranked alongside every other platform.