THE COMPARISON / A CLOSER LOOK
Vapi vs Retell AI
Compare the listed plans, useful capabilities, and practical tradeoffs.
Prices and features reflect editorial records. Check vendor terms before you buy; documentary checks do not imply hands-on testing.
Vapi
🔴DeveloperVoice AI
Vapi is the developer platform for voice AI agents — build, deploy, and scale phone agents with usage-based pricing and bring-your-own model keys.
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Starting Price
$0.05/minute + provider costsRetell AI
🟡Low CodeAI Voice Agents
AI phone-agent platform for inbound and outbound voice — from $0.07/min for Retell Voice, sub-second latency, bring-your-own-LLM, HIPAA-ready, with a no-code…
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Starting Price
$0.07/minFeature Comparison
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Vapi - Pros & Cons
Pros
- ✓Transparent usage pricing — $0.05/min plus BYO model keys is easy to forecast
- ✓Sub-700ms turn-taking feels conversational, not robotic
- ✓Provider-agnostic stack lets you pick best-of-breed STT, LLM, and TTS
- ✓Developer surface is solid: SDKs, webhooks, custom function calls
- ✓HIPAA and PCI options unlock healthcare and fintech use cases
Cons
- ✗Not a no-code product; non-developers will need engineering support
- ✗HIPAA at $2k/mo and ZDR at $1k/mo add up quickly for small teams
- ✗10 concurrent lines is fine for most pilots but extra lines at $10/mo scale fast
- ✗Model costs pass through, so a chatty agent on GPT-4 can be expensive
- ✗Documentation around advanced routing and warm transfers is still maturing
Retell AI - Pros & Cons
Pros
- ✓Genuinely low-latency conversational voice — sounds closer to natural than most competitors
- ✓Bring-your-own-LLM per agent — mix cheap models for scripted flows and premium for reasoning
- ✓Per-minute pricing scales predictably vs live call-center headcount
- ✓No-code Agent Studio makes it accessible to ops teams, not just engineers
- ✓HIPAA BAA and on-prem options unlock regulated verticals (healthcare, legal, finance)
Cons
- ✗Per-minute costs stack on top of LLM token costs — chatty premium models get expensive fast
- ✗Voice quality varies noticeably across tiers; premium voices are meaningfully better
- ✗Requires solid prompt-engineering discipline to avoid off-script hallucinations on the phone
- ✗Telephony still lives on Twilio/Vonage under the hood — Retell-provisioned numbers don't cover every region
- ✗Real production deployments need human fallback flows tested carefully — miss handling remains a category-wide weakness
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