Developer / platform voice AI (not turnkey SMB-only)

Retell AI

https://www.retellai.com/ · HTTP check: 200

Warm transfer

yes

Transfers supported; AI fee stops after transfer per FAQ.

Booking

yes

Templates/platform support booking workflows; confirm per agent build.

Partner / affiliate

https://www.retellai.com/partners

Pricing as published

Pay-as-you-go; listed all-in about $0.07–$0.31/minute depending on voice/LLM/telephony. Example calculator showed ~$0.11/min. No platform subscription required for starter. Enterprise custom.

Source: https://www.retellai.com/pricing

Best-fit verticals

builders / agencies, custom voice agents, businesses with developer resources

Key integrations

HubSpot, Zoho CRM, Pipedrive, Twilio, RingCentral, Stripe, Shopify, custom APIs, webhooks

Notes

Included because many SMBs encounter it via agencies; not a one-click receptionist.