G2 Vendor Directory

Synthflow vs. Retell AI

A side-by-side comparison based on G2 review data.

MetricSynthflow

by AgentFlow AI GmbH

Retell AI

by Retell AI

Overall rating4.54.8
Review count1,0162,640
Ease of use8.79.1
Ease of setup8.49.0
Quality of support8.28.6
Meets requirements8.79.2
NPS64.49060392.739778
Small Business92.7%85.9%
Mid-Market6.9%14.1%
Enterprise0.4%0.0%
Total page views5,0294,705
Total LLM citations41,45968,798

Synthflow

Synthflow provides enterprise-ready voice AI agents that automate inbound and outbound phone calls. Businesses use Synthflow to handle appointment scheduling, lead qualification, customer support, and call routing through natural, conversational voice technology. With a no-code builder, 200+ integrations, and deployment in under 3 weeks, Synthflow makes it easy for teams to scale automation without engineering effort. AI agents operate with sub-500ms latency in 30+ languages and meet global compliance standards (SOC 2, HIPAA, GDPR).

Pros

  • Ease of Use
  • Setup Ease
  • Easy Integrations
  • Integrations
  • Easy Setup
  • Simple

Retell AI

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.

Pros

  • Ease of Use
  • Helpful
  • User Interface
  • Integrations
  • Simple
  • Easy Integrations