Now Available

Build what matters.

Ferni's technology is opening up. Build your own AI coaches, create specialized personas, and reach people who need exactly what you offer. The platform that powers Ferni—now yours.

Full API documentation Everything you need to build

SDK & libraries TypeScript-first development

Monetization Sell on the marketplace

Now available January 2026

Terminal

$ npm create ferni-agent my-coach

Creating your first Ferni agent...

WHAT'S GROWING

Everything you need to build amazing voice agents

Bundle System

Self-contained agent packages with identity, voice, behaviors, and knowledge. Everything in one place.

Available

CLI Tools

Create agents from templates, validate bundles, and manage your team from the command line.

Available

Voice Integration

Seamless Cartesia voice synthesis with per-agent voice IDs and emotional expression.

Available

Smart Handoffs

Agents automatically hand off to each other based on context. Define triggers, done.

Available

Persona Builder

Visual tools for creating coaches—define personality, voice, and expertise without code.

Available

Revenue Sharing

Publish to the Ferni Marketplace and earn when people use your personas.

Coming Soon

SNEAK PEEK

Simple agent definition

Define your agent's personality in JSON. Here's what it will look like.

          
          
          
        
identity.json

        {
  "name": "Luna",
  "displayName": "Luna the Life Coach",
  "tagline": "Your thoughtful companion for personal growth",
  
  "voice": {
    "provider": "cartesia",
    "voiceId": "a0e99841-438c-4a64-b679-ae501e7d6091"
  },
  
  "personality": {
    "warmth": 0.85,
    "humorLevel": 0.6,
    "formality": 0.3,
    "traits": ["empathetic", "encouraging", "insightful"]
  },
  
  "knowledge": {
    "domains": ["personal development", "mindfulness", "habits"],
    "expertise": ["goal setting", "stress management"]
  }
}
      

Start building today

Create your first AI persona in minutes using our visual wizard. No code required to get started.

Create Your First Persona Open Console

MIT License

Built on open source

Ferni's agent framework is open source. Build with confidence knowing you can inspect, modify, and contribute to the code.

View on GitHub