Find the Perfect Voice AI Solution

Retell.ai

Retell AI offers fast, scalable voice agents with response times under a second and impressive developer flexibility. You can bring your own LLM, customize behavior deeply, and monitor everything through real-time dashboards. It’s well-suited for teams with in-house engineering that want control and scale. But the learning curve is real—getting up and running takes work, integrations often require custom scripts, and pricing isn’t transparent. While it performs well under the hood, Retell isn’t the most approachable platform for teams seeking simplicity or industry-ready templates out of the box.

Sierra AI

Sierra AI delivers a comprehensive conversational platform with multi-channel voice and chat, real-time analytics, and enterprise-grade security out of the box. But you won’t find a price list anywhere—expect to negotiate usage-based fees that climb steeply as you add advanced features or extra channels. Its “build once, run everywhere” Agent OS sounds neat, but customizing flows and integrating with legacy systems often requires dedicated engineering time. The command center offers deep controls, yet teams frequently find it overengineered for routine tasks and in need of training to manage. And despite claims of empathetic, human-like responses, at scale the agents can still stumble over accents or complex queries, leaving gaps that demand human intervention.

PolyAI

Poly AI positions itself as a multilingual powerhouse with natural-sounding agents and enterprise use cases. But without public pricing, you’ll need to talk to sales before understanding costs—and anything outside standard English can trigger custom pricing. Integrations work fine if you’re on Salesforce or a mainstream stack, but anything else means custom development. In real use, the assistant occasionally forgets context or asks you to repeat yourself, which breaks the illusion fast. For all the polish, it often feels like a heavy lift to get consistent, high-quality performance.

Bland AI

Bland AI charges $0.09 per minute plus a monthly fee, offering basic phone automation with a minimalist interface. But it only supports English by default, only integrates with Twilio, and charges extra for features like voice cloning or concurrency. While it’s pitched as developer-friendly, much of the work—like setting up context management or error handling—falls on you. The voice often sounds flat or overly scripted, and the system can struggle to handle complex flows without dropping threads. It’s an entry-level solution that quickly shows its limitations.