Retell AI | AI Agent | Alternates | Alternates - AI Agent Discovery Platform

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Retell AI

Name: Retell AI
Price: Contact for Pricing USD
Author: Retell AI

Backed By Retell AI

Conversational voice agent API for real-time interactive calls.

AI Agents, Governance & Orchestration

Overview

Developer-first platform for building, testing, deploying, and monitoring AI voice agents that handle inbound/outbound phone calls with natural conversation flow, interruptions handling, CRM integrations, billing, knowledge-base logic, and LLM support like GPT‑4.

Use Cases

Automated appointment booking calls

Customer support voice automation

Lead qualification over phone

Interactive survey agents

Top Integrations

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API

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SDK

Product Info

Deployment Method

API-basedSaaS

Model Type

Closed Source

Support

Pricing

Self-Serve (Pay-As-You-Go)

Modular LLM/Voice choice

Enterprise

Discounted high-volume pricing

Alternates Research On The Product

Top Features

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Voice AI API & SDK (Node.js, Python)

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Real-time Transcription/Post-Call Analysis

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Built-in LLM Testing/Simulation

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Customizable LLM Integration (GPT, Claude, Gemini)

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Multilingual Support (31+ languages)

Strengths

Ultra-realistic voice quality and tone
Very low latency (sub-800ms) with seamless interruption handling (barge-in)
Powerful and flexible API for custom developer control
Reliable at production scale and high concurrency
Cost-effective compared to modular or high-cost competitors

Weaknesses

Compliance gaps for highly regulated enterprises (lacks ISO 27001, RBAC, Audit Logs)
Data training is performed on de-identified customer data unless the user opts out of call recording.
API changes have occurred in the past due to fast-paced development.
Lack of visual testing/sandbox forces live debugging.
Highly inconsistent/poor support for non-Enterprise users.

Reviews From The Web

Real user experiences from across different platforms

Moving to Retell AI was the best decision we've made in customer engagement. The voice agents sound so natural that customers often ask which rep they spoke to, not realizing it was AI. Onboarding was smooth, integrations were ready-made, and the reporting dashboard gave us real visibility into agent performance. Retell just feels like it was built for production scale, while competitors felt like prototypes.

Parth Devrani

2 months ago

Product Hunt

Recommendations

Engineering teams building custom, high-volume, low-latency voice solutions

w-latency voice solutions

Teams who need granular control over their LLM and telephony stack

telephony stack

Non-technical business users or solo founders

Small businesses/low-volume users with fixed budgets (due to variable cost)

ts (due to variable cost)

Final Verdict

The most cost-effective and highest-quality conversational experience (low latency, human-like voice) at production scale, specifically for engineering teams building custom voice automation solutions.

Best For

•Engineering teams building custom, high-volume, low-latency voice solutions
•Teams who need granular control over their LLM and telephony stack
•Businesses replacing an expensive or modular voice stack (Twilio, Vapi) for better cost/performance

Watch Out For

•Poor/non-existent customer support for non-Enterprise users
•Reports of billing difficulties and hard cancellation
•Compliance gaps for highly regulated enterprises (lacks ISO 27001, RBAC, Audit Logs)
•Data training is performed on de-identified customer data unless the user opts out of call recording.

No dedicated visual drag-and-drop workflow builder (Code/API required for flow changes) No live sandbox or visual flow testing Lacks enterprise features like ISO 27001, RBAC, and Audit Logs Support is community-driven/slow for non-Enterprise users Can be complex for non-technical teams

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