Quality and selection of voices, flawless integration with n8n, cal.com, twilio, gohighlevel, ergonomic interface which even in 2026 is rare - I insist is rare!, then it's also the analytics, billing, huge selection of LLMs. Overall an amazing platform Review collected by and hosted on G2.com.

I'd love to be able to directly buy phone number for much more places in the world (Latam, Western and Eastern Europe, Asia, Africa, etc.) - the current offer is very limited and I do understand it's not the main business, but it will help a lot. Even N America there are 2 out of 23 countries were you can buy phone numbers... Review collected by and hosted on G2.com.

Retell AI is honestly one of those tools that just works.

Simple. Fast. Powerful.

The best part?

You don’t feel like you’re fighting the tech — it feels like the tech is working for you.

If you’re building voice agents, doing inbound or outbound calls, or trying to automate real conversations… Retell makes it ridiculously smooth.

Low latency. Natural voices. Clean setup.

No nonsense.

The truth is… most voice platforms overcomplicate things.

Retell doesn’t.

You plug it in.

Connect your stack.

And suddenly… your AI is actually talking like a human.

If you’re serious about voice AI — this is not optional.

It’s a weapon.

very short

Retell AI just works.

Fast. Simple. Powerful.

The best part? It sounds human.

If you’re building voice AI — this is a no-brainer. Review collected by and hosted on G2.com.

Nothing , Nada , it just work , maybe i was a bit confused about webhooks ect Review collected by and hosted on G2.com.

Retell AI makes it surprisingly easy to build and deploy voice agents without needing extensive telephony or AI infrastructure experience. The platform integrates speech recognition, language models, and voice synthesis into a single workflow, which significantly reduces development time. I also appreciate the ability to connect external tools and APIs, customize call flows, and quickly test changes. The call quality and responsiveness are generally strong, making it a practical solution for businesses looking to automate phone conversations. Review collected by and hosted on G2.com.

Some parts of the platform can be difficult to navigate, especially for new users. Documentation and dashboard terminology occasionally assume prior knowledge, which can make setup more challenging than expected. Certain advanced features require additional configuration and troubleshooting, and pricing can become difficult to estimate as usage scales. More onboarding guidance and clearer explanations of settings and agent configuration options would improve the overall experience. Review collected by and hosted on G2.com.

What I like best about Retell AI is its ability to create highly natural, human-like voice interactions in real time. The responsiveness and low latency make conversations feel smooth and engaging, which is critical for building truly effective voice applications. I also appreciate how flexible and developer-friendly it is, allowing seamless integration and customization for different use cases. Overall, it strikes a great balance between performance, realism, and ease of use, making it a powerful tool for modern conversational experiences Review collected by and hosted on G2.com.

There’s very little to dislike about Retell AI, but like any platform, there’s always room for even more advanced customization as needs grow. Review collected by and hosted on G2.com.

From what I've used it so far, I find the agent's programming part extremely powerful, intuitive, and easy to use. I'm always discovering new features that leave me very impressed. Review collected by and hosted on G2.com.

So far I haven't noticed anything I don't like. Review collected by and hosted on G2.com.

I came into this quite sceptical - I had never really done anything more advanced in AI than using ChatGPT. I spent hours researching to make sure I was using the right system & that led me to Retell AI.

Building the perfect agent is hard, but building an agent that works before getting more technical is actually way easier than I would of thought - I am moving more towards perfect everyday using the more advanced features - learning as I go. Review collected by and hosted on G2.com.

My only gripe about Retell is that because I am UK based I would appreciate more UK accents when building an agent - hopefully these will come as the ecosystem grows. Review collected by and hosted on G2.com.

The sub-second latency and human-like voice models are unmatched. The custom function capabilities allow us to build autonomous, enterprise-grade sales architecture by triggering external webhooks mid-conversation to close high-ticket deals. Review collected by and hosted on G2.com.

he native integrations could be stronger. Relying on custom webhooks and phantom forwarding to bridge Retell with GoHighLevel sub-accounts introduces unnecessary friction. A native LeadConnector/GHL integration would make scaling much faster Review collected by and hosted on G2.com.

I have had an amazing experience with Retell AI. It is user-friendly, easy to implement, and cost-efficient. I have been working with Retell AI for the past year and have found it to be an excellent platform. It has consistently delivered reliable performance for building voice AI agents. I highly recommend giving it a try if you are looking for a solid solution for voice AI development. Review collected by and hosted on G2.com.

I think should add more voices like gemini, and other top quality voices and also in different languages Review collected by and hosted on G2.com.

Retell makes it surprisingly easy to build and deploy voice agents quickly, especially for real-world use cases like reception, booking, and lead capture. The latency is solid, the voice quality feels natural, and the overall developer experience is clean. I also like how flexible it is with prompts and knowledge bases—it lets you iterate fast and get something production-ready without heavy engineering. Review collected by and hosted on G2.com.

The biggest gap is around state management and structured flow control. A lot of critical behaviour (like handling contact preferences, not repeating questions, or remembering collected details) still relies too heavily on prompt engineering instead of built-in logic. This can make agents inconsistent at scale. Better native handling for forms, memory, and conversation state would significantly improve reliability. Also, debugging conversations and understanding why an agent made a decision could be clearer. Review collected by and hosted on G2.com.

The ease of integration with telephony providers via SIP trunking, the natural quality of voices with ElevenLabs, and the ability to customize the agent with dynamic variables. The latency is very low and the conversations sound really natural. Additionally, the integration with n8n allows for the automation of complete customer acquisition and service flows. Review collected by and hosted on G2.com.

The documentation for integrations with European telephony providers could be more detailed. The initial setup with Spanish numbers requires quite a bit of trial and error. It would also be helpful to have more examples of integration with automation tools like n8n. Review collected by and hosted on G2.com.