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How-to
How to Build a Voice AI Agent (Step by Step)
Build a voice AI agent in minutes: write a prompt, pick a voice and provider, add tools, connect a number, and test it live in your browser.
You can build a working voice AI agent in minutes, no infrastructure to run.
1. Write the prompt
Describe the agent's job, tone and rules.
2. Pick a voice and provider
Choose a voice and one of five engines (Vapi, ElevenLabs, Retell, Bolna, Ultravox).
3. Add tools
Give it function-calling to book, capture leads, or hit your webhook.
4. Connect a number or widget
Attach your phone number or drop the web widget on your site.
5. Test it live
Place a browser call and iterate.
Try it free
Frequently asked questions
How long does it take to build a voice AI agent?
Minutes, write a prompt, pick a voice and provider, connect a number.
Do I need to code?
No for the basics; the API is there when you want it.
Can I test before going live?
Yes, place a web call from your browser.