Overview
Retell AI is an LLM-based conversational platform for building, deploying, and managing AI voice agents that handle phone calls at scale. It uses proprietary voice orchestration for natural, low-latency conversations and can autonomously handle lead qualification, support, and appointment booking.
Our take
Retell builds voice agents for calls with pay-as-you-go pricing and free credits to start, which is the right structure for experimenting with a workload that is inherently variable. Voice agents now handle routine calls well. Design attention belongs on the exceptions — the call that goes off-script and whether the caller can reach a human.
Worth it if
Developers building call automation for well-defined, high-volume interactions.
Look elsewhere if
Emotionally sensitive or complex calls, where an agent that will not escalate causes real harm.
✨ Features
Low-Latency Voice
Proprietary turn-taking and realistic voices deliver natural conversations at ~600ms latency.
Agentic Builder
A drag-and-drop framework with real-time function calling and streaming RAG.
Flexible Deployment
Supports batch calling, branded caller ID, verified numbers, and SIP trunking.
Quality Monitoring
Post-call analysis, AI quality assurance, simulation testing, and analytics dashboards.
⚖️ Pros & Cons
Pros
Cons
💰 Pricing
Pay as you go
$0.07 /min
- Voice agents $0.07-$0.31/min
- Chat agents from $0.002/message
- $10 free credits to start
- 20 free concurrent calls
- Call analytics and transcripts
Enterprise
Custom
- Contact sales for a quote
- Dedicated stable server
- Unlimited concurrent calls
- SSO and custom MSA/DPA
- 24/7 omnichannel support
Categories
❓ Frequently Asked Questions
How does per-minute pricing compare to a seat-based tool?
It suits variable volume and makes budgeting less predictable. Cost tracks call duration, so a flow that keeps callers on the line longer costs more as well as annoying them. Model average handle time times expected volume including failed calls, and set spend caps before going live.
Must I tell callers they are speaking to AI?
Several jurisdictions now require disclosure for automated calls, and beyond the legal position it is the single thing people react most negatively to discovering later. A sentence at the start costs nothing and removes a whole category of complaint, including the ones that reach regulators.