Twilio Voice (ConversationRelay) vs Vapi
Pricing last verified from each vendor's own site.
Verdict
Twilio ConversationRelay is $0.07/min plus Twilio call minutes, and you bring your own LLM. Vapi bills per minute with transcriber, model and voice costs listed separately and $5 free credits.
- Consider Twilio Voice (ConversationRelay) if: You want carrier-grade telephony and control over your own LLM backend.
- Consider Vapi if: You want a higher-level agent builder with more built-in tooling.
Factual summary
- Both are listed under Voice AI & Dialers.
- Directly comparable starting prices are not available for both: Twilio Voice (ConversationRelay) — Pay as you go (US, as of Aug 2026): ConversationRelay voice AI orchestration $0.07/min on top of call minutes (local outbound $0.0140/min, inbound $0.0085/min; browser/app $0.0040/min); local numbers $1.15/mo, toll-free $2.15/mo; volume and committed-use discounts; free trial with $15 credit, no card; Vapi — Usage-based per minute, with transcriber, model and voice costs listed separately; $5 free credits; optional support packages: Core $29/mo, Pro $999/mo minimum.
- Twilio Voice (ConversationRelay) lists channels Vapi does not: sms.
This is a factual comparison drawn from vendor sites, not a recommendation. Which fits depends on your channels, volume and budget.
| Twilio Voice (ConversationRelay) | Vapi | |
|---|---|---|
| Summary | Cloud communications API; ConversationRelay connects your own LLM to live calls with speech handled by Twilio. | Developer platform for building voice AI agents. |
| Starting price | See vendor | See vendor |
| Pricing details | Pay as you go (US, as of Aug 2026): ConversationRelay voice AI orchestration $0.07/min on top of call minutes (local outbound $0.0140/min, inbound $0.0085/min; browser/app $0.0040/min); local numbers $1.15/mo, toll-free $2.15/mo; volume and committed-use discounts; free trial with $15 credit, no card | Usage-based per minute, with transcriber, model and voice costs listed separately; $5 free credits; optional support packages: Core $29/mo, Pro $999/mo minimum |
| Model | usage | usage |
| Free trial | Yes | — |
| Free plan | — | — |
| Channels | phone, sms | phone |
| Last verified | 2026-11-02 | 2026-10-28 |
FAQ
What is the difference between Twilio Voice (ConversationRelay) and Vapi?
Twilio ConversationRelay is $0.07/min plus Twilio call minutes, and you bring your own LLM. Vapi bills per minute with transcriber, model and voice costs listed separately and $5 free credits.
Which is cheaper, Twilio Voice (ConversationRelay) or Vapi?
We can't compare entry prices directly. Twilio Voice (ConversationRelay): Pay as you go (US, as of Aug 2026): ConversationRelay voice AI orchestration $0.07/min on top of call minutes (local outbound $0.0140/min, inbound $0.0085/min; browser/app $0.0040/min); local numbers $1.15/mo, toll-free $2.15/mo; volume and committed-use discounts; free trial with $15 credit, no card. Vapi: Usage-based per minute, with transcriber, model and voice costs listed separately; $5 free credits; optional support packages: Core $29/mo, Pro $999/mo minimum.
When should I choose Twilio Voice (ConversationRelay) over Vapi?
Consider Twilio Voice (ConversationRelay) if: You want carrier-grade telephony and control over your own LLM backend. Consider Vapi if: You want a higher-level agent builder with more built-in tooling.
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