Best AI voice agent platforms (2026)

1. Jelliu — best for business operators

Jelliu is an end-to-end, no-code platform for running AI agents across voice, WhatsApp, email, and chat — with outbound campaigns, a native CRM, and live analytics built in. A non-technical team can launch and go live the same day, and it scales from a small business to a BPO contact center on one platform.

Pricing is usage-based and starts with a free 15-minute trial — no per-minute developer billing to model and no six-figure enterprise contract to sign. Choose Jelliu to operate AI agents for sales, support, scheduling, or collections without an engineering team; it ships with studio-quality, multilingual voices.

2. Vapi — best for developers who want control

Vapi is a developer-first voice API with granular control over the model, transcriber, and voice provider, billed per minute. Ideal for engineering teams building a bespoke voice product; the campaign, CRM, and operator layers are yours to build. See the full Jelliu vs Vapi comparison.

3. Retell AI — best for embedding voice in a product

Retell offers a clean API and SDKs for building voice agents inside your own application, with transparent per-minute pricing and compliance options (HIPAA/SOC 2). Great programmability; the surrounding operations layer is self-assembled. See Jelliu vs Retell.

4. PolyAI — best for enterprise call containment

PolyAI is an enterprise voice assistant known for very high call-containment (reported 80–87%) and pre-trained industry assistants, typically sold on annual enterprise contracts. Strong for large contact centers with the budget and procurement cycle to match; less suited to teams that want to launch this week. See Jelliu vs PolyAI.

5. Sierra — best for premium conversational CX

Sierra builds polished, human-feeling conversational agents for enterprise customer experience, often priced around outcomes. Excellent for brands that want a high-touch, enterprise-grade deployment; it is not a self-serve, no-code operator platform. See Jelliu vs Sierra.

6. Bland AI — best for programmatic phone automation

Bland makes it easy for developers to spin up automated phone calls at scale via API. It stays close to that primitive — campaigns, CRM, and multichannel live in your own systems. See Jelliu vs Bland.

7. Synthflow — best for quick no-code voice agents

Synthflow is a no-code builder focused on standing up voice agents fast. If you mainly need a capable voice agent, it works well; Jelliu goes further with true omnichannel, a native CRM, and campaign management. See Jelliu vs Synthflow.

8. Lindy — best for general no-code AI agents

Lindy is a no-code platform for building general AI agents and automations across many tasks, including voice. It is broad rather than voice-operations-specialized; Jelliu is purpose-built to run customer-facing voice and messaging operations with campaigns, a CRM, and live analytics.

9. Cognigy — best for enterprise contact-center automation

Cognigy is an enterprise conversational-AI platform for large contact centers, typically low-code and sold on enterprise contracts. A strong fit for enterprises standardizing on a CCaaS-adjacent stack; heavier to adopt than a self-serve platform you can trial today.

How to choose

• Pick Jelliu if a non-technical team needs to launch and run agents across channels with campaigns, CRM, and analytics included — and wants to start free.
• Pick Vapi, Retell, or Bland if developers are building a custom voice product and want low-level control with per-minute pricing.
• Pick PolyAI, Sierra, or Cognigy if you are a large enterprise prioritizing containment and can take on an annual contract.
• Pick Synthflow or Lindy for accessible no-code builds.