Vapi vs Retell AI: What You Need to Know
The two developer voice-API rivals: Vapi's maximum flexibility vs Retell's clear, itemized pricing — both still leave you building the CRM, calendar, and whitelabel layer yourself.
Reviewed by Maxime Houle, Founder, SeldonFrame. I build one of these tools — every ranking here says when the others win. Facts checked July 2026.- Vapi pricing: $0.05/min hosting + STT/LLM/TTS/telephony pass-through (~$0.25–$0.33/min real-world); HIPAA $2,000/mo
- Retell AI pricing: $0.07–$0.31/min all-in, plus per-minute add-ons (KB, guardrails, PII, QA) and monthly fees per number
- The real trade-off: The two developer voice-API rivals: Vapi's maximum flexibility vs Retell's clear, itemized pricing — both still leave you building the CRM, calendar, and whitelabel layer yourself.
- The third option: SeldonFrame ships the whole front office at $29/mo flat — see below
Vapi
Vapi is a developer-first API platform for building custom voice AI agents. You assemble and host your own voice stack.
- +You're an engineering team building a custom voice product
- +You need full control over each piece (custom STT/TTS pipelines, custom orchestration)
- +You have developers on staff to own setup and maintenance
Retell AI
Retell AI is developer infrastructure for building voice and chat AI agents. It's priced per minute, built from separate pieces you assemble yourself.
- +You're a developer who values itemized infrastructure pricing
- +You're building your own product on voice rails, not delivering client front offices
- +You want fine-grained control of every piece of the pipeline
Vapi vs Retell AI vs SeldonFrame
| Features | Vapi | Retell AI | SeldonFrame |
|---|---|---|---|
| Best for | Engineering teams building custom voice stacks | Developers building custom voice/chat agents on API rails | Agencies & builders running AI front offices for clients |
| Pricing model | $0.05/min hosting + STT/LLM/TTS/telephony pass-through (~$0.25–$0.33/min real-world); HIPAA $2,000/mo | $0.07–$0.31/min all-in, plus per-minute add-ons (KB, guardrails, PII, QA) and monthly fees per number | From $29/mo flat — unlimited workspaces (agency whitelabel from $99/mo) |
| AI receptionist (calls, SMS, chat) | Voice agents only — you design, wire together and maintain them via API | Voice + chat agents via API — you build the receptionist yourself | Native — AI receptionist answers, qualifies & books across voice, SMS & web chat |
| Website, CRM & booking behind the agent | None — no CRM, website or booking calendar; you build the system around the agent | None — no CRM, website or booking calendar | Included — multi-page website, CRM, booking calendar, intake forms, review requests in every workspace |
| Whitelabel & client workspaces | None — no agency dashboard or client management | None built-in — third-party wrapper products fill the gap | Included — whitelabel client portal, per-client workspaces, custom domains, one-click multi-client deploy |
| AI usage costs | You can bring your own API key, but every other piece still bills per minute | Billed per minute, per component | BYOK — bring your own AI (and Twilio) keys and pay providers at raw cost, zero markup |
| Sell / resell what you build | No native reseller program | Certified-partner referrals, but no built-in whitelabel product | Built in — publish agents to the marketplace or rent them via MCP (5% marketplace fee) |
Prices checked July 2026 on Vapi's pricing page.
Prices checked July 2026 on Retell AI's pricing page.
Zoom out and see both against 23 other platforms on the interactive CRM Pricing Index →
The honest take
Vapi: Choose Vapi if you're an engineering team building a genuinely custom voice product and want full control over every piece of the stack.
Retell AI: Choose Retell if you're a developer building your own voice product and want clear, itemized infrastructure pricing with deep configurability.
Frequently asked questions
Which is better, Vapi or Retell AI?
It depends what you need. Vapi: Choose Vapi if you're an engineering team building a genuinely custom voice product and want full control over every piece of the stack. Retell AI: Choose Retell if you're a developer building your own voice product and want clear, itemized infrastructure pricing with deep configurability.
What does Vapi cost vs Retell AI?
Vapi: $0.05/min hosting + STT/LLM/TTS/telephony pass-through (~$0.25–$0.33/min real-world); HIPAA $2,000/mo. Retell AI: $0.07–$0.31/min all-in, plus per-minute add-ons (KB, guardrails, PII, QA) and monthly fees per number.
Is there an alternative to both?
Yes — SeldonFrame ships the AI receptionist plus the website, CRM and booking calendar it books into, for $29/mo flat with unlimited workspaces. See how it compares: /alternatives.
Can I switch from Vapi or Retell AI?
Yes — see the full switching guides for each: /alternative-to-vapi and /alternative-to-retell-ai.
Need what both Vapi and Retell AI do?
Most people running this comparison actually need the outcome underneath both tools: calls and chats answered, leads qualified, jobs booked into a real calendar and CRM, on a site the client owns. SeldonFrame ships that whole front office from one conversation — $29/mo flat, unlimited workspaces, your own AI keys at raw cost, whitelabel included.