Retell AI

Phones are still where a lot of business gets lost. Patients play phone tag with schedulers, leads go cold because nobody called back within the hour, and support lines either cost a fortune to staff or leave people on hold. Retell AI is built for that problem: it lets you put AI voice agents on your phone lines to answer inbound calls, run outbound campaigns, book appointments, qualify leads and hand off to a human when the conversation needs one.

The pitch isn't just "a bot that talks." Retell puts a lot of weight on the parts that usually break voice AI in production. It claims around 600ms latency, a proprietary turn-taking model that knows when to stop and when to listen, and agents that can work through IVR keypad menus, transfer calls and send SMS. Around that sits a no-code studio with a drag-and-drop canvas for building call flows, a testing layer that can simulate thousands of scenarios and turn real calls into regression tests, and QA that can review up to 100% of your AI calls. That's the stuff you'll actually need once you're handling real volume instead of running a demo.

The customer numbers on retellai.com are specific enough to take seriously: Pine Park Health reports a 38% jump in scheduling NPS, SWTCH says it cut support costs by over 50%, and Medical Data Systems says it handles 100% of inbound calls with a 30% transfer rate. Pricing is pay as you go, billed by the minute, and Retell explicitly contrasts that with platforms that want an annual contract before you've written a line of code. There's a free way to start, plus a live demo where an agent calls your phone. If you run a call-heavy operation in healthcare, insurance, logistics or collections, it's one of the more production-minded options in this category. The tradeoff is that the specific per-minute rates weren't in the material we reviewed, so you'll want to model costs against your own call volume before committing.