Retell AI
What is Retell AI?
Retell AI is a voice automation platform for support, operations, sales, healthcare, and developers that handles phone calls with low-latency orchestration and natural turn-taking. It includes Call Transfer, Book Appointments, Knowledge Base, Navigate IVR, Batch Call, and real-time transcription and summarization. Retell integrates with Twilio, HubSpot, OpenAI, and Cal.com, and serves 3,000+ businesses. Plans run Pay as you go Free and Enterprise Plan custom.
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At a glance
- Retell AI is best for support and operations teams that need to automate high-volume phone calls without losing call quality.
- Pay as you go Free; Enterprise Plan Custom
- Yes — The platform offers a flexible API for building and orchestrating custom communication experiences.
What does Retell AI do?
Retell AI handles phone-call automation by combining low-latency voice orchestration, natural turn-taking, and agentic actions mid-call. Teams can build flows with Call Transfer, Book Appointments, Knowledge Base, and Navigate IVR, then deploy them across inbound and outbound calling with Batch Call, Branded Call ID, and Verified Phone Numbers. The result is a voice layer that can answer, route, and complete tasks instead of just transcribing conversations. At scale, Retell says it serves 3,000+ businesses and has powered over half a million calls, with 99.99% uptime and 20 concurrent calls included on the pay-as-you-go plan. Its industry pages show real-time transcription and summarization, CRM syncing, and 24/7 call handling, while customer stories point to outcomes like $280,000 in monthly collections for Medical Data Systems and 38% higher scheduling satisfaction in healthcare. The platform also exposes a flexible API for custom communication experiences and supports integrations such as Twilio, HubSpot, OpenAI, and Cal.com.
Why use Retell AI?
- It combines sub-second voice orchestration with interruption recovery, so conversations stay natural under real call conditions.
- Its pay-as-you-go entry point lets teams test live call automation without annual contracts or upfront commitments.
- Enterprise options add dedicated stable servers, custom SSO, and custom MSA/DPA terms for stricter procurement needs.
- The platform includes 20 concurrent calls on the free tier, giving small teams room to pilot real traffic.
- Customer stories show measurable operational impact, including 38% higher scheduling satisfaction and 80% of support calls automated overnight.
Who is Retell AI for?
- Support operations teams that need to automate repetitive calls and reduce manual handoffs.
- Healthcare front-desk teams that need appointment scheduling and patient follow-up by voice.
- Sales and lead-qualification teams that need always-on call coverage and routing.
- Operations teams that need outbound batch calling and post-call analysis at scale.
- Developers that need an API-first voice platform for custom call workflows.
What are Retell AI's key features?
Call Transfer
Route live calls to a human agent with warm transfer support, helping teams hand off complex cases without losing context.
Book Appointments
Schedule meetings during calls using Cal.com or Fillout, so voice agents can convert conversations into booked time slots.
Knowledge Base
Answer questions from synced knowledge sources with Streaming RAG and auto-sync, keeping responses current across support and sales calls.
Navigate IVR
Handle phone menus and route callers through IVR flows, reducing wait time and helping callers reach the right destination faster.
Batch Call
Place outbound calls at scale with batch calling and SIP Trunking, useful for campaigns, reminders, and follow-up workflows.
Compliance & Security
Support enterprise controls like SSO, custom MSA/DPA terms, and personal info redaction for regulated call operations.
Real-Time Transcription & Summarization
Transcribe and summarize calls as they happen, giving teams searchable records for QA, follow-up, and performance review.
Seamless CRM & Tool Integrations
Connect voice workflows to HubSpot, Salesforce, Zendesk, Intercom, and Make so call outcomes can update existing systems automatically.
What does Retell AI integrate with?
- Make
- Twilio
- Vonage
- Go High Level
- n8n
- HubSpot
- SIP Trunking
- OpenAI
- Cal.com
- viaSocket
- Intercom
- Fillout
- DAT
- Advoware
- DATEV
- Webflow
- Shopify
- Telnyx
- Nice
- Talkdesk
- Livevox
- Five9
- Jane App
- Dentrix
- OpenDental
- Epic
- ChiroTouch
- aCOM Health
- eClinical
What are Retell AI's use cases?
Support teams automate call handoffs
Support operations teams use Retell AI to answer repetitive calls, resolve common questions, and hand off edge cases to humans with Call Transfer. They pair it with Real-Time Transcription & Summarization so agents get a clean recap instead of listening back to the full call.
Front desks book patient visits
Healthcare front-desk teams use Retell AI to schedule appointments and manage patient follow-up by voice, using Book Appointments to capture bookings without back-and-forth. Knowledge Base helps the agent answer routine questions consistently while keeping the call moving.
Outbound batches for operations
Operations teams use Retell AI to run outbound batch calling at scale, using Batch Call to reach large lists without manual dialing. Post Call Analysis turns each conversation into actionable summaries, helping teams spot outcomes, follow-ups, and missed connections faster.
Always-on qualification for sales
Sales and lead-qualification teams use Retell AI for 24/7 call coverage, routing prospects to the right next step with Flexible Flows & Smart Routing. Smooth CRM & Tool Integrations keeps lead records updated automatically so hot opportunities do not slip through.
How does Retell AI work?
- Connect your first telephony source through Using SIP Trunking Connect to Any Telephony or a supported integration like Twilio, then route calls into a new voice agent.
- Configure the agent's behavior with High Configurable Agentic Framework, add Knowledge Base content, and set Preset Functions for common actions like booking or lookup.
- Test conversations in Simulation Testing and review Continuous QA to Ensure Performance Across Edge Cases before sending the agent live.
- Launch with Branded Call ID or Verified Phone Numbers, then monitor Real-Time Transcription & Summarization and Post Call Analysis to catch issues quickly.
- Sync outcomes into smooth CRM & Tool Integrations and refine routing, transfer rules, and voice quality as call volume grows.
How much does Retell AI cost?
Pay as you go
Free- Go live in minutes with $10 in free credits. Full platform access, no commitments. Just build, test and pay as you scale.
- $0.002+/ msg for AI Chat Agents
- Full Platform Access
- Pre-built Agent Templates
- Call Analytics and Transcripts
- Simulation Testing
- Webhooks and API Access
- 20 Free Concurrent Calls
- Community and Email Support
Enterprise Plan
Custom Pricing- Dedicated Implementation Support (add-on)
- Custom MSA/DPA terms
- Role-based Access Control
- Dedicated Stable Server
- Custom SSO
- High Cap on Concurrent Calls
- 24/7 Omnichannel Support with Dedicated Portal
Frequently asked questions
What is Retell AI?
Retell AI is a voice automation platform for support, operations, sales, healthcare, and developers that handles phone calls with low-latency orchestration and natural turn-taking. It includes Call Transfer, Book Appointments, Knowledge Base, Navigate IVR, Batch Call, and real-time transcription and summarization. Retell integrates with Twilio, HubSpot, OpenAI, and Cal.com, and serves 3,000+ businesses. Plans run Pay as you go Free and Enterprise Plan custom.
How much does Retell AI cost? Is it free?
Retell AI has a free plan, with paid tiers including Enterprise Plan at Custom Pricing.
What is Retell AI used for? Who is it for?
Retell AI is used for Call Transfer, Book Appointments, and Knowledge Base. It's built for Support operations teams that need to automate repetitive calls and reduce manual handoffs, Healthcare front-desk teams that need appointment scheduling and patient follow-up by voice, and Sales and lead-qualification teams that need always-on call coverage and routing.
Does Retell AI have an API and what does it integrate with?
The platform offers a flexible API for building and orchestrating custom communication experiences. It integrates with Make, Twilio, Vonage, Go High Level, n8n, and 25 more.
Editor's read
Check whether the free tier's 20 concurrent calls cover your pilot volume, since higher call concurrency is pushed into Enterprise. If you need dedicated implementation support, custom SSO, or custom MSA/DPA terms, verify those are included in the procurement path you plan to use.
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