See It In Action
Human-like conversations
Never miss a call
Auto-detected
Real-time response
Introducing
62% of callers won't call back if no one picks up. Call0 answers every call, books appointments, and handles support — 24/7, in 30+ languages. Your customers never wait again.
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Faster customer resolution time
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Issues resolved before escalation
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Languages
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Setup time
Agents Platform
Agents listen, read and interact just like humans would across phone, chat, email and WhatsApp.
Active Call
+1 (555) 012-3456
Maria Kowalski
Returning customer · 3 previous calls
"Of course, I can help you with that. Let me check our availability for this week. We have openings on Wednesday at 10am and Thursday at 2pm — which would you prefer?"
Ultra-low latency voice AI that handles inbound and outbound calls with natural conversation flow, real-time sentiment detection, and seamless handoffs.
Features
Your AI agent never sleeps. Handle calls anytime, anywhere.
Premium AI voices that sound human and professional.
Book appointments directly into your calendar system.
Auto-detect and respond in 11+ languages.
Track call metrics, transcripts, and insights.
Transfer complex calls to your team seamlessly.
Voice Technology
Create controllable, expressive speech with our advanced voice AI. Choose from dozens of voices or clone your own.
Sarah
Friendly and Warm
George
Warm Storyteller
Jessica
Bright and Warm
River
Neutral and Calm
const client = new Call0({
apiKey: "YOUR_API_KEY"
});
await client.agents.create({
name: "Support Agent",
voice: "sarah",
prompt: "You are a helpful..."
});Cost Calculator
Compare the cost of human phone operators vs Call0 for your business
No Surprises
"Will it sound robotic?"
Listen to the voices above — 92% of callers can't tell it's AI. We use the most natural voices from ElevenLabs and Cartesia.
"What if it messes up?"
Complex calls get seamlessly transferred to your team. You set the rules — the AI follows them.
"Is setup complicated?"
Describe your business, pick a voice, done. Most teams go live in under 2 minutes. No IT required.
"Is it worth the cost?"
Call0 costs less than one missed appointment per month. The average business saves $3,900/mo vs. hiring.
Pricing
Buy credits upfront. Use them across voice, WhatsApp, and email. No subscriptions, no surprises.
$0.15/min
Voice calls
Free 1st, then $5
AI agent
$10/mo
Phone number
$0.03/msg
$0.02/msg
First agent free + 15 free minutes included on signup — no credit card required