The call quality and latency are genuinely impressive — conversations feel natural, not robotic. Multilingual support works really well for Italian and Dutch out of the box. The conversation flow builder is intuitive and the Cal.com integration for live booking during calls works perfectly. Pay-as-you-go pricing is fair for agencies starting out. Review collected by and hosted on G2.com.

European phone numbers are not available directly in the dashboard — you have to connect Twilio or Telnyx separately, which adds a few extra steps for non-US deployments. Would be great to have native European number purchasing built in. Review collected by and hosted on G2.com.

Retell AI stands out for its ability to deliver highly natural, human-like voice interactions with minimal latency. The platform is straightforward to integrate, and its APIs are well-structured, which reduces development time significantly. Its real-time capabilities and reliability make it especially useful for building conversational agents that feel responsive and fluid rather than robotic. The customization options also allow for precise control over tone and behavior, which is critical for production-grade applications. Review collected by and hosted on G2.com.

While Retell AI performs well in real-time scenarios, there are limitations in deeper conversational control and edge-case handling. Fine-tuning nuanced behaviors can require additional workarounds, and documentation, although decent, can lack depth in more complex use cases. Pricing can also become a concern at scale, especially for high-volume applications, making cost optimization an important consideration. Review collected by and hosted on G2.com.

Retell AI makes scaling outbound calls extremely efficient. The ability to run high-volume, consistent conversations without human fatigue is a huge advantage. It handles initial outreach, qualification, and follow-ups well, which frees up my time to focus on closing deals. The customization of scripts and real-time responsiveness also helps it feel more natural compared to other AI dialers. Review collected by and hosted on G2.com.

There are still limitations around handling edge-case conversations and sounding fully natural in every scenario. Sometimes the AI can miss context or respond slightly off-script, which can affect conversion. Setup and fine-tuning also take time to get right, and integrations could be smoother to better fit into existing workflows. Review collected by and hosted on G2.com.

We integrated Retell AI into our lead qualification workflow and the results have been impressive. The voices are ultra-realistic; most of our customers don't even realize they are speaking to an AI agent at first. It has significantly reduced our team's repetitive call load by handling FAQs and booking appointments directly into our CRM. I love the transparent pay-as-you-go pricing, which made it easy to start small and scale as we saw the ROI. The dashboard is intuitive, and the built-in analytics give us clear insights into call sentiment and success rates. Highly recommend for any business looking to automate their phone operations. Review collected by and hosted on G2.com.

The built-in analytics give us clear insights into call sentiment. The only small downside is that the dashboard can feel a bit overwhelming at first because of all the features, but once you get the hang of it, it’s incredibly powerful. Highly recommend for any business looking to automate operations. Review collected by and hosted on G2.com.

The ease of creating high-quality voice agents and being able to connect Claude code to enhance the quality of the agents to create for my clients. Review collected by and hosted on G2.com.

When I publish a version and test the voice agent through a direct call, by doing the same scenario, I sometimes encounter bugs. The latency announced by retell is not the same as in the test call. It would be good to choose the currency to avoid being dependent on the conversion from USD to euro, for example. Review collected by and hosted on G2.com.

I can connect it directly to my agent for rapid response to user feedback and internal building. The flexibility and pay as you go are so nice as a builder I haven't worried about costs yet and I've gotten a lot of practice building a competent agent. Review collected by and hosted on G2.com.

Selection of voices and models, there are so many options and TTS providers having the same model names it would be nice to have that area cleaned up or streamlined a bit. But I do still like the overall flexibility. Review collected by and hosted on G2.com.

The most notable feature is the extremely low latency, which allows for fluid conversations without the awkward silences typical of other voice services. The model's ability to handle interruptions naturally is above average, greatly facilitating the development of agents that truly seem human in support or sales environments.

And the ease of integration through its API and the robustness of its Webhooks. It offers granular control over the call status and the transition between conversation states. The quality of the voice synthesis, combined with fast language processing logic, makes it one of the most solid solutions for scaling voice operations. Review collected by and hosted on G2.com.

The pricing model can become expensive when scaled to a very high call volume, especially when compared to "in-house" implementations of open-source models. Additionally, there is a lack of flexibility to customize certain parameters of proprietary voice models without relying entirely on their closed infrastructure. Review collected by and hosted on G2.com.

- Ease of use

- Super fast interface

- The settings are just balanced enough: Not too basic for engineers not to complex for non-technical people Review collected by and hosted on G2.com.

I would like to see more accents for English language, like Irish. I wasn't able to find that

And also I need to be able to select multiple agents at once to move them into a folder, right now it's one by one and in all agents it doesn't show what folder they're already in too. Would be nice to set that up. Review collected by and hosted on G2.com.

I like that as a new user, it was easy for me to figure out how to do what I needed to do without too much instruction. Everything is laid out in a clear manner and the documentation is as in-depth as it needed to be to help me figure out how to build something better than I initially planned. Review collected by and hosted on G2.com.

Haven't really found any dislikes. I've tried other similar services and ran right back to Retell. Review collected by and hosted on G2.com.

The voice quality and low latency make conversations feel natural. Setting up agents is straightforward and the dynamic variables let me customize each call with real user data. It powers the core of my product and just works. Review collected by and hosted on G2.com.

Pricing can add up quickly at scale and there is no React Native SDK for mobile apps which requires workarounds for anything beyond web. Review collected by and hosted on G2.com.