What is Retell AI?
Retell AI is a platform for building AI voice agents that make and receive phone calls. Teams design call flows on a drag-and-drop canvas, adding functions, integrations, call transfers, DTMF (keypad) handling, SMS and custom logic. The agent can check availability and book appointments, use a knowledge base to answer questions, navigate IVR menus, and hand the caller over to a human agent with a briefing.
Once built, agents can be tested with simulated scenarios and deployed for inbound lines, outbound campaigns, web widgets or SMS. The platform includes batch calling, verified phone numbers and branded caller ID, post-call analysis, QA review of calls and A/B testing of agent versions. Pricing is pay-as-you-go per minute, with a dedicated enterprise plan for higher concurrency and compliance needs.
Key features
- Drag-and-drop call flow builder
- Appointment booking with availability checks
- Call transfer from AI to human agents
- Outbound batch campaigns with pacing and retries
- Post-call analysis and AI quality assurance
- Webhooks and API access
Who is it for
- Customer support teams
- Healthcare and clinics
- Sales and lead qualification teams
- Developers building voice applications
How to get started with Retell AI
- Create an account and get 10 USD of free starter credits.
- Build the conversation flow for your agent in the drag-and-drop editor.
- Add functions, integrations and handoff to a human agent.
- Test the agent on scenarios before deploying it.
- You handle many phone calls and want to automate them with a voice AI.
- You want to pay only for minutes used, without annual contracts.
- Low response latency and natural-sounding conversation matter to you.
- You need a free plan without limits, since the trial ends once credits are used.
- You need a Polish-language interface - the platform does not offer one.
Pros and cons
- Human-sounding voices with low latency (about 600ms, per the page)
- Pay only for minutes used, with $10 free credits to start
- Enterprise features such as dedicated servers and custom SSO require contacting sales
- Per-minute costs depend on the chosen LLM, voice and telephony options
Retell AI pricing
| Plan | Price | Includes |
|---|---|---|
| Pay as you go | 0.07-0.31 USD / month | Per minute for AI voice agents; 0.002+ USD per message for chat agents; $10 free credits; 20 concurrent calls included; community and email support |
Prices copied from Retell AI pricing, checked October 12, 2026. Currency as shown by the vendor; taxes may apply.
Is Retell AI free?
There is a free trial. Pay-as-you-go plan includes $10 in free credits and 20 free concurrent calls.
Featured in
Retell AI alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Zendesk AI | 19 USD/mo | trial | Customer support & chatbots |
 Crisp | 45 USD/mo | trial | Customer support & chatbots |
 Sierra | not listed | ? | Customer support & chatbots |
 Tidio | 29 USD/mo | yes | Customer support & chatbots |
 Decagon | not listed | ? | Customer support & chatbots |
 Botpress | 150 USD/yr | yes | Customer support & chatbots |
All alternatives to Retell AI →
FAQ
What is Retell AI used for?
Platform for building, deploying and managing AI voice agents that handle inbound and outbound phone calls for support, scheduling and lead qualification.
Is Retell AI free?
There is a free trial. Pay-as-you-go plan includes $10 in free credits and 20 free concurrent calls.
How much does Retell AI cost?
The cheapest paid plan is 0.07-0.31 USD/mo (vendor pricing, October 12, 2026).
What are the best Retell AI alternatives?
Closest alternatives: Zendesk AI, Crisp, Sierra, Tidio, Decagon.
Data checked October 12, 2026 on the vendor website (retellai.com).