Helix AI

A voice agent that books four hundred calls a day without sounding like one.

Launch Helix AI → This is my interpretation. The button above opens the live front-end built in the product's own language.

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I · Brief

The problem.

A clinic was losing 60% of inbound enquiries to voicemail after 6pm. A human receptionist at night didn't pencil. A bot that sounded like a bot was worse than nothing.

II · Build

What I shipped.

What

A voice agent that answers inbound calls, qualifies leads, and books straight into the calendar.

How

Vapi orchestration, ElevenLabs voice, Claude for reasoning, Twilio for PSTN, Cal.com for booking.

Why

Out-of-hours booking rate went from 0 to 38%. First month paid for the build.

III · Counted Representative figures. Actual client metrics are under NDA.

Calls / day

412

Avg duration

3m 12s

Booking conversion

38%

IV · Specs

The stack.

Technology

TypeScript
Vapi
ElevenLabs
Anthropic
Twilio

Colophon

Team size: 1
Category: AI / Voice Agent
Version: V0.9
Shipped: Shipped Feb 2025

V · Changelog

V0.9

Feb 2025

Private beta, 4 clinics live.

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Helix AI

The problem.

What I shipped.

The stack.

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