Build custom voice agents that scale
Built for developers
API-native and compatible with any stack for total control.
Configurable by design
1000+ points of config, bring your own models, or choose from 200+.
Talk to Vapi give it a Try
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Teams at trail-blazing startups to Fortune 500 companies deploy voice agents on the Vapi platform.
The most configurable API to build leading voice AI products and scale phone operations.
Calls
300M+
Assistants Launched
2.5M+
Developers
500K+
Use cases
Feels human. Moves the needle.
Inbound calls
Outbound calls
Inbound calls
powers 400,000+ daily calls.
saves 100s
of engineering hours monthly.
A key technical requirement was the ability to bring our own stack — Vapi's developer-friendly API-first approach made this possible.
Quang Tran
CTO, FleetWorks
Receive call
Shipper Info
Use tool
Fetch_available_jobs_from_broker
Condition
Job Available?
Features
Flexible for engineers. Easy for business users.
Multilingual
Talk to agents in English, Spanish, Mandarin, or one of 100+ other supported languages.
API-native
Everything is exposed as an API, with 1000s of configurations and integrations.
Automated testing
Design test suites of simulated voice agents to identify hallucination risks before going to production.
Bring your own models
Bring your own API keys for transcription, LLM, or text-to-speech models. Or, plug in your own self-hosted models.
Tool calling
Plug in your APIs as tools to intelligently fetch data and perform actions on your server.
A/B experiments
Test different variations of prompts, voices, and flows to continuously optimize performance.
ENTERPRISE
Reliable.
Scalable.
Secure.
99.9% Uptime
Custom real-time audio infrastructure with enterprise-grade reliability.
Forward-deployed Team
Deployment assistance with a dedicated forward-deployed engineer to go live in a week.
Sub-500ms Latency
Scale up and down to millions of calls in minutes with ultra-low latency interactions.
AI Guardrails
Built-in conversation guardrails prevent model hallucinations and ensure data integrity.
SOC2, HIPAA, & PCI Compliant
Enterprise-level security for healthcare and financial services.
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