Retell AI vs Vapi
Where they differ
From the pricing tiers and capability tags we track. A capability missing on one side means we have not recorded it there, not that the tool cannot do it.
At a glance
Retell AI and Vapi both appear in this directory's agent listings. Prices below were read from the vendors' own pages, most recently on October 12, 2026. Retell AI starts at $0.07 usage-based and Vapi at $29/mo, billed over different periods, so neither is ranked cheaper here. Vapi has a free plan and Retell AI does not. We track voice cloning on Retell AI and transcription on Vapi; both cover ai agents and speech to text. No score and no winner: the facts do the picking.
Capability tags are factual labels we assign when a tool is added; they describe what a tool does, not how well it does it.
Checked against the vendors. Written from each vendor's own site and last re-checked there: Retell AI on October 12, 2026 · Vapi on October 11, 2026. Vendors change pricing and features without notice, so confirm anything that decides your purchase on the vendor's page.
Retell AI
Voice AI platform for building and deploying autonomous phone agents
Retell AI is a voice AI platform that builds and runs autonomous phone agents for inbound and outbound calls. Agents operate with roughly 600ms latency, handle mid-sentence caller interruptions, and support language switching across over 50 languages. Engineering teams can construct agents through a drag-and-drop canvas or programmatically via Node.js and Python SDKs.
Vapi
The voice AI platform for developers to build voice agents
Vapi is a voice AI platform enabling developers to build, test, and deploy voice agents with support for over 100 languages and sub-500ms response times. The platform features bring-your-own models, automated testing, and comprehensive developer tooling.
Also in agents
A tool we have an affiliate relationship with. It is not part of the comparison above and we are not calling it the better pick.
- Running automated signal-based outbound sequences
- Consolidating separate lead data and sales engagement stacks
- Scaling personalized cold outreach across email and LinkedIn
Retell AI and Vapi in action
Each vendor's own walkthrough, from its homepage or official YouTube channel. We don't make these videos and we don't rate them.
Retell AI
Vapi
Key features
Retell AI
- Sub-second voice response latency of approximately 600ms
- Interruption handling that pauses speech when callers cut in
- Support for more than 50 languages with mid-call switching
- SIP trunking and BYO telephony support for Twilio and Telnyx
- Live human handoffs with context transfer
Vapi
- Sub-500ms real-time voice processing response times
- Support for 100+ languages using native voice models
- Bring-your-own models for transcription, LLM, and text-to-speech
- Automated testing suite with hallucination detection
- Tool calling and API integration capabilities
What each one does well
Retell AI
- ✓ Automating inbound support lines and after-hours call routing
- ✓ Running multi-step outbound calling campaigns and appointment scheduling
- ✓ Developers needing programmatic voice primitives and custom LLM integration
Vapi
- ✓ Building conversational customer support phone agents
- ✓ Integrating voice assistants into existing enterprise workflows
- ✓ Deploying multilingual voice applications with custom LLMs
People also ask
Which is cheaper, Retell AI or Vapi?
Retell AI starts at $0.07 usage-based and Vapi starts at $29/mo. The two are billed over different periods, so we do not rank them on price.
Does Retell AI or Vapi have a free plan?
Retell AI publishes no free plan, and Vapi has a free plan.
What is the difference between Retell AI and Vapi?
Retell AI and Vapi are both tracked for ai-agents, speech-to-text, text-to-speech, developer-api. Of the capabilities they do not share, only Retell AI is tracked for voice-cloning, workflow-automation, and only Vapi is tracked for transcription.
How much do Retell AI and Vapi cost?
Retell AI: from $0.07 usage-based. Vapi: free plan, then $29/mo.
Answers are generated from the tracked plans and capability tags shown above, so they move when the vendors' pages do.
Full fact sheets, FAQs, and discussion links: Retell AI · Vapi · all agents tools