Vapi vs Twilio Voice AI / Twilio + AI
Compare Vapi's orchestration with Twilio ConversationRelay. See why $0.05 and $0.07 per minute cover different things, plus a practical pilot checklist.
By Morak · Sources and pricing checked
Which should you choose?
Shortlist Vapi when you want a voice-agent platform that coordinates model providers. Shortlist Twilio ConversationRelay when you want the speech layer inside a calling application you control. Existing engineering ownership matters more than the small difference between the advertised base rates.
These recommendations are Morak's assessment of public vendor documentation, not hands-on performance test results. How we research · Jump to feature comparison
Choose Vapi for provider orchestration
Vapi separates hosting from speech and language-model provider charges. Our recommendation: evaluate it when you want to configure those pieces through an agent platform. Check the plan's concurrency and retention limits against your production workflow.
Vapi platform pricingChoose Twilio for your existing application
ConversationRelay exchanges messages with your application over WebSocket. Our recommendation: favor this route when you already have engineers owning call routing and business logic, and want to extend that application with speech. Validate the development effort with a complete call flow.
Twilio application integrationWhat the price includes
USD unless stated otherwise. Usage examples exclude taxes and negotiated discounts. Confirm current terms before purchase.
Vapi: $50 per 1,000 minutes before providers
At $0.05/min, 1,000 billable hosting minutes are $50, excluding model and transport costs. Bringing your own API keys moves model billing to those providers; it does not make their usage free. Add applicable plan extras separately.
Vapi hosting and provider ratesTwilio: a different $70 subtotal
At $0.07/min, 1,000 ConversationRelay minutes are $70. Phone service, your LLM, and application costs must also be included. The $20 difference between these illustrative subtotals does not establish which complete implementation costs less.
Twilio ConversationRelay ratesWhat to test before committing
Use the same model where possible and the same call script, including an interruption and a failed backend request. Compare all invoice components, completed tasks, and the work needed to debug failures. Test simultaneous calls against your expected peak rather than extrapolating from one successful demo.
Developer API
Vapi
Developer-oriented voice agent platform for building phone agents with custom workflows and integrations.
Developer API
Twilio Voice AI / Twilio + AI
Telephony and communications platform that developers can combine with AI models to build custom voice agents.
Highlighted rows differ between these picks
| Attribute | Vapi | Twilio Voice AI / Twilio + AI |
|---|---|---|
| Platform type | Developer API | Developer API |
| Pricing | $0.13-$0.33/min $0.05/min hosting + provider costs | Usage Based pricing US local voice from $0.014/min outbound and $0.0085/min inbound |
| Test it | Free trial | Free trial |
| Calls | Inbound, Outbound | Inbound, Outbound |
| Human handoff | Yes | Yes |
| Setup difficulty | Technical | Technical |
| Use cases | Customer Support Appointment Scheduling Lead Qualification Outbound Calling | Customer Support Appointment Scheduling Outbound Calling Lead Qualification |
| Useful for |
|
|
| Integrations | ||
| Twilio | ||
| Custom API | ||
| CRM | ||
| Zapier | — | |
| Calendar | — | |
| Contact center | — | |
| Webhooks | — | |
Platform type
- Vapi
- Developer API
- Twilio Voice AI / Twilio + AI
- Developer API
Pricing
- Vapi
$0.13-$0.33/min
$0.05/min hosting + provider costs
- Twilio Voice AI / Twilio + AI
Usage Based pricing
US local voice from $0.014/min outbound and $0.0085/min inbound
Test it
- Vapi
- Free trial
- Twilio Voice AI / Twilio + AI
- Free trial
Calls
- Vapi
- Inbound, Outbound
- Twilio Voice AI / Twilio + AI
- Inbound, Outbound
Human handoff
- Vapi
- Yes
- Twilio Voice AI / Twilio + AI
- Yes
Setup difficulty
- Vapi
- Technical
- Twilio Voice AI / Twilio + AI
- Technical
Use cases
- Vapi
- Customer SupportAppointment SchedulingLead QualificationOutbound Calling
- Twilio Voice AI / Twilio + AI
- Customer SupportAppointment SchedulingOutbound CallingLead Qualification
Useful for
- Vapi
- • Developer teams
- • Custom call workflows
- • Voice AI prototypes
- Twilio Voice AI / Twilio + AI
- • Telephony infrastructure
- • Custom developer builds
- • Existing Twilio teams
Integrations
| Vapi | Twilio Voice AI / Twilio + AI | |
|---|---|---|
| Twilio | ||
| Custom API | ||
| CRM | ||
| Zapier | — | |
| Calendar | — | |
| Contact center | — | |
| Webhooks | — |
What would these cost to run?
Enter your call volume once and see Vapi and Twilio Voice AI / Twilio + AI priced at the same usage, ranked alongside every other platform.