Retell AI
Builds AI voice agents that handle inbound and outbound phone calls with low latency.
Overview
Retell AI is a platform for building and deploying AI voice agents that carry on natural phone conversations. It provides low-latency speech recognition and synthesis, a flow-based agent builder, and telephony infrastructure for inbound and outbound calling. Retell AI is aimed at developers and operations teams who want to automate phone support, appointment scheduling, or lead qualification without building voice pipelines from scratch. Usage is billed per minute of call time.
Key features
- Low-latency voice AI with natural interruption handling
- Inbound and outbound call support
- Built-in telephony (no separate provider needed)
- Flow and LLM-based agent configuration
- Call analytics and transcripts
- API for programmatic agent creation
Pricing
- Pricing model
- Usage-based
- Monthly
- Usage-based pricing
- Yearly
- Not on record
- Free plan
- No
- Free trial
- Yes
- Last verified
- Checked October 4, 2026
Pros
- Handles full phone call automation with low latency
- Includes telephony, so no separate provider is required
- Flexible agent configuration for different use cases
Cons
- Usage-based pricing makes costs harder to predict at scale
- Requires developer involvement to set up and tune agents
Who should use it
- Automating inbound customer support phone calls
- Running outbound AI calling for lead qualification or appointment reminders
- Developers building voice AI without managing telephony infrastructure
Intermediate, Advanced · Small teams, Mid-size teams, Enterprise
Who shouldn't
- Chat or text-based support channels
- Non-developer teams without access to engineering support
Facts
- Category
- AI customer support
- Platforms
- Web, API
- Integrations
- Twilio, Zapier, HubSpot, Salesforce
- API
- Available
- Skill level
- Intermediate, Advanced
- Team size
- Small teams, Mid-size teams, Enterprise
- Data and privacy
- We have no verified details on data handling. Read the vendor's privacy policy before uploading sensitive material.
Alternatives
- AdaAI customer support
Enterprise AI customer service platform that automates support interactions at scale.
Custom pricing (contact sales) - VoiceflowAI customer support
Visual platform for designing and deploying AI chat and voice agents without heavy coding.
Pricing information is currently unavailable. - Intercom (Fin)AI customer support
Customer messaging platform with an AI agent that resolves support queries automatically.
From $29/month - BotpressAI customer support
Open-source conversational AI platform for developers building chatbots and voice agents.
From $150/month, billed annually
Frequently asked questions
How much does Retell AI cost?
Usage-based pricing. Checked October 4, 2026.
Does Retell AI have a free plan?
Retell AI has no permanent free plan on record, but it offers a free trial.
Who is Retell AI best for?
Automating inbound customer support phone calls; Running outbound AI calling for lead qualification or appointment reminders; Developers building voice AI without managing telephony infrastructure.
Which platforms does Retell AI run on?
Web, API.
Does Retell AI have an API?
Yes, Retell AI offers an API.
What are the alternatives to Retell AI?
Tools often weighed against Retell AI include Ada, Voiceflow, Intercom (Fin), Botpress.