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Retell AI

4.8(2,638 G2 reviews)Redwood City, USAFounded 2023

Retell AI is a powerful conversational AI platform designed to automate voice, SMS, and chat interactions with natural, humanlike performance. Built on top of your choice of large language models (LLMs), Retell allows teams to spin up real-time AI agents that handle calls, trigger messaging workflows, and integrate seamlessly into your existing systems—all without writing code. At its core, Retell delivers Voice Agent Automation that feels indistinguishable from speaking with a real person. Calls are handled by LLM-native agents that respond within 600 milliseconds, support multi-turn logic, and operate across 31+ languages with native-quality speech. You can build and manage your own agent flows using an intuitive drag-and-drop builder that supports IVR trees, dynamic transfers, real-time webhooks, and CRM integration. Whether you’re scheduling appointments, answering FAQs, or qualifying leads, these agents are fast, reliable, and production-ready. Beyond voice, Retell also enables SMS and chat automation. Agents can send contextual messages during or after phone calls, or operate as standalone text/chat bots. You can use Twilio numbers or bring your own for outbound campaigns, enabling flexible, multi-channel engagement. To ensure quality and insight, Retell offers built-in testing and QA tools. You can simulate conversations, A/B test call flows, and monitor live call data through detailed dashboards. Track CSAT, latency, sentiment, and conversation outcomes—all in one place. Voice agents can be deployed via Twilio, SIP, branded caller ID, or embedded using Retell’s web SDKs. Unlike legacy IVR or scripted systems, Retell is built from the ground up to be AI-native and fully customizable. Whether you’re in healthcare, logistics, fintech, or customer support, Retell’s platform lets you scale personalized conversations across channels—boosting customer satisfaction and reducing operational costs.

Overall scoreTasks passed divided by all 46 assigned evaluation tasks. This result was evaluated on Aug 6, 2026.

87of 100

40/46 tasks passed

G2 task evaluationScores based on G2's standardized task evaluation, separate from buyer reviews.
Accuracy86
Policy compliance90
G2 buyer reviewsAggregate scores reported by verified G2 reviewers. These do not affect the task-based Overall Score.
Ease of use89
Quality of support83

Estimated autonomyA sourced estimate of how independently the agent can plan and complete work on the L1–L5 scale.

Where this agent sits on the L1–L5 autonomy scale.

L2-L3
L1L2L3L4L5

Skills

Product-specific work documented in reviewed product sources.

Appointment Booking

Inbound Support Call Automation with Knowledge Base

Call Transfer & IVR Navigation

Performance claims

Vendor-reported

Handles 100% of inbound calls with only a 30% transfer rate

Product strategyOperating and delivery choices explicitly documented in reviewed product sources.

Forward-deployed engineering
unknown
Self-serve
yes
Agent-callable
yes

What G2 reviewers say

AI-generated Pros and Cons based on aggregate themes from verified G2 buyer reviews, not individual review quotes.

AI-generated from verified G2 buyer reviews.

Pros

Reviewers like the platform's user-friendly interface, the quality of the voice agents, the ability to customize calls, and the platform's overall efficiency in automating tasks.

Cons

Reviewers mentioned issues with the platform's high costs, especially for smaller projects or startups, occasional technical difficulties, and limitations in customization for more advanced or niche use cases.