The latency is incredibly low, which is the most critical factor for a natural-sounding voice agent. I love how easily it integrates with existing LLMs and the flexibility provided by the API for handling complex call flows and custom tools. Review collected by and hosted on G2.com.

While the documentation is generally good, I’d like to see more advanced examples for handling edge cases in multi-turn conversations. Additionally, the cost per minute can scale quickly for high-volume outbound campaigns. Review collected by and hosted on G2.com.

Retell AI provides incredibly realistic, low-latency conversational models that make deploying automated sales and lead follow-up agents seamless. The API is robust and integrates perfectly with complex backend workflows and custom automation setups. Setting up custom SIP trunks for routing calls is highly reliable, allowing for scalable deployment of outbound cart recovery agents and inbound qualification bots. The interruption handling and natural conversational pacing make the agents sound distinctly human, which is crucial for maintaining high engagement rates on cold or warm calls. Review collected by and hosted on G2.com.

While the platform is incredibly powerful, the documentation for highly complex, edge-case SIP configurations or ultra-specific prompt tuning could be a bit more fleshed out. Additionally, scaling up massive concurrent batch calling campaigns requires careful budget monitoring, though the ROI from the recovered leads generally justifies the cost. Review collected by and hosted on G2.com.

Easy to set up AI voice agents without needing to code. The interface is intuitive and it integrates well with webhooks for automating bookings and call workflows. Review collected by and hosted on G2.com.

Still early in using it so hard to say, but pricing could be clearer for small businesses and solo developers just getting started. It was also hard to connect to cal.com for 3 diffrent types of business. It was also hard do call transfer, it never seemed to work when i tested it out. Review collected by and hosted on G2.com.

Retell AI makes it incredibly easy to connect AI voice agents to real phone numbers. The SIP trunking integration with Twilio works seamlessly, and the dashboard makes it simple to assign agents to inbound numbers. The agent builder and prompt configuration are intuitive, and the call quality is excellent. Review collected by and hosted on G2.com.

The initial setup of custom telephony via SIP trunking can be confusing, especially for first-time users connecting Twilio numbers. Better step-by-step documentation for the Twilio integration would help. Also, the dashboard occasionally has UI loading issues when navigating between sections. Review collected by and hosted on G2.com.

Retell AI is very fast so there are no long silences during a call. It feels like a real person because it stops talking right away if the customer interrupts. You can connect it to your other tools easily with their clear instructions. The system is very strong and does not crash when many people call at the same time. This makes it perfect for local businesses that cannot afford to miss a single lead. Review collected by and hosted on G2.com.

The pricing is hard to understand because you have to pay different fees for the phone line and the AI. It is difficult for a normal person to set up because you need to know how to code to make it work well. If you have a problem, it can take a long time to get an answer from their support team. You also have to pay the full price even when you are just testing the system to see if it works. Review collected by and hosted on G2.com.

Incredible Realism and Low Latency: The sub-second response times make conversations feel incredibly natural. The voices avoid those awkward robotic pauses, and the system handles "barge-ins" beautifully—meaning if a caller interrupts mid-sentence, the agent gracefully stops and listens just like a real human would.

Developer-Focused Flexibility: It doesn't box you in with rigid constraints. You get the raw building blocks—like webhooks, custom LLM integrations, and robust APIs—giving you complete freedom to design exactly how the agent behaves and seamlessly tie it into custom backends.

Production-Ready Reliability: It is built to scale effortlessly. Knowing the infrastructure can handle high-volume concurrent calls while providing built-in compliance (HIPAA, SOC 2, GDPR) and detailed post-call analytics takes a massive load off the engineering and deployment process. Review collected by and hosted on G2.com.

The Rewarding Learning Curve: Because it is so robust and developer-centric, it skips the simplistic no-code visual builders. You really have to roll up your sleeves and write code to unlock its full potential. While it takes a bit more time to map out complex, multi-language flows, the exciting trade-off is that you get absolute, fine-grained control over the final product!

Modular Pricing Structure: The billing is layered, meaning you pay for the base minutes plus the specific LLM, speech-to-text, and voice engines you choose to plug in. While it makes forecasting exact monthly costs a bit of a mathematical puzzle at first, it is actually a huge plus because it ensures you are only ever paying for the exact, top-tier components you want to use. Review collected by and hosted on G2.com.

I like the simplicity of Retell like we can connect to platforms very easy ad if i would specific about something tha would be tool like there are built in tools and also very easy to customize. Review collected by and hosted on G2.com.

Well the thing i dislike about Retell AI is maybe nothing like it doesnt have that much hold but i dont think for small Agencies like mine should have that high level of hold but yea it can be pain in future but not in starting Review collected by and hosted on G2.com.

I´am very impressed whit how natural and human-like the voice agents sound. The platafom is incredibly intuitive, and the integration proces is seamless, which has significantly improvesd our workflow. Review collected by and hosted on G2.com.

while the plataform is excellent, I woullove to see more granular customization options for specific use cases. Additional, more flexible pircing tiers for smaller proyects woul be great improvement. Review collected by and hosted on G2.com.

What impressed us most about Retell AI is how natural the voice conversations feel. Compared to other voice AI tools we tested, the latency is very low and the interactions feel surprisingly smooth. The API is flexible and makes it possible to integrate AI calling into existing systems without too much complexity. It’s a powerful platform if you want to automate phone interactions while still maintaining a professional customer experience. Review collected by and hosted on G2.com.

The platform is very powerful, but because of that it can take a little time to understand all configuration options when you first start. Some additional examples and ready-made templates for common use cases would help new users get started faster. That said, once everything is set up, the system works reliably. Review collected by and hosted on G2.com.

I really like the many agents it has, with different voices, and all the monitor functions it has to provide enough information to the customer about how the system is working. Review collected by and hosted on G2.com.

It is probably because I was in a rush that it wasn't as immediately easy as I´d like to understand all the different tabs. In reality, I don't have anything that dislike me from Retell. Review collected by and hosted on G2.com.