Retell AI Review 2026
#1 AI Voice Agent Platform for Automating Calls
What is Retell AI?
Retell AI is an AI voice agent platform for automating inbound and outbound phone calls with LLM-based, human-like, low-latency conversations. It offers a drag-and-drop agentic framework, function calling, and telephony integrations.
Best for
Mixed
Use cases
- AI receptionist
- Appointment setting
- Lead qualification
- Debt collection
Key features
~600ms latency voice AI
Drag-and-drop agentic framework
Real-time function calling
Streaming RAG knowledge base
SIP trunking & batch calling
Pricing
Model
freemium
Price range
$10 free usage on signup; usage-based pricing
Free tier
Yes
Integrations
Retell AI integrates with 8 tools including:
HubSpotTwilioSalesforceZapierMakeCal.comFive9Genesys
Market position
Market score
89
Share of voice
Notable customers
AnkerEveriseTripleTenBrightChampsMaticCentsPine Park HealthGiftHealthSunshine LoansSpareLabs
Market data from Adam's GTM Report.
Team behind Retell AI
- BW
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