Vapi

What is Vapi?

Vapi is a developer-focused platform for building and deploying voice AI agents at scale. It provides a highly configurable API that lets engineering teams create custom voice agents for both inbound and outbound phone operations. The platform supports over 500,000 developers and has powered more than 300 million calls across teams at startups and Fortune 500 companies alike. Vapi is built around the idea that voice AI infrastructure should be accessible through code, with SDKs available in TypeScript, Python, and other languages to fit existing development workflows.

Key Features

• Custom Agents: Build and deploy tailored voice AI agents configured to specific business logic and conversation flows.
• API Integration: Connects with over 40 applications, including OpenAI, Twilio, GitHub, and VS Code so teams to fit Vapi into an existing stack.
• Call Management: Handles both inbound and outbound calls, with Vapi reporting support for 400,000+ daily inbound calls on the platform.
• Multi-language Support: Supports multiple languages for voice interactions and is usable for teams serving international customers.
• Concurrency Control: Includes 10 concurrent call lines by default on the Pay As You Go plan, with additional lines available at $10 per line per month.
• HIPAA Zero Data Retention: Available as an add-on for healthcare and regulated industries, priced at $1,000 per month.
• SMS/Chat Channel: Supports text-based interactions alongside voice, billed at $0.005 per message on the usage-based plan.

Use Cases

• Developers building voice AI products: Engineering teams use Vapi's API and SDKs to build custom voice agents without managing the underlying telephony and speech infrastructure, reducing development time significantly.
• Businesses managing customer interactions: Companies route inbound customer calls through Vapi-powered agents to handle common requests, reducing load on human support staff and improving response times.
• Scaling outbound call operations: Teams deploy outbound voice agents for use cases such as appointment reminders, lead qualification, or notifications, running large volumes of calls without proportional staffing increases.

Strengths and Weaknesses

Strengths:

• Highly configurable API that gives engineering teams fine-grained control over voice agent behavior.
• Saves hundreds of engineering hours monthly, according to user feedback on G2 (rated 4.5 out of 5 across 142 reviews).
• Broad integration support covering major model providers for speech-to-text, text-to-speech, and large language models.
• Active developer community with dedicated Discord, events, and documentation resources.

Weaknesses:

• Pricing structure can be confusing, as costs span multiple components including Vapi hosting, model provider fees, and transport costs billed separately.
• Costs can grow quickly at scale, since model provider charges are passed through at cost on the Pay As You Go plan.
• The free tier is limited in scope, with new accounts starting on $10 in free credit rather than an ongoing free usage allowance.

Pricing

• Pay As You Go: Starts with $10 free credit, usage-based billing. Vapi hosting costs $0.05 per call minute and $0.005 per SMS/chat message. Call concurrency includes 10 lines, with additional lines at $10 per line per month. Model provider costs (speech-to-text, LLM, text-to-speech) are billed at cost. Call history retained for 14 days, chat history for 30 days. HIPAA Zero Data Retention available as an add-on at $1,000/month.
• Enterprise: Contact sales, annual contract. Includes custom call concurrency, volume-based pricing for calls and messaging, model provider costs included, custom data retention, 99.99% infrastructure SLA, named support engineer, account manager, and private Slack support.

FAQ

What is Vapi?

Vapi is a voice AI platform that provides an API and SDKs for developers to build, deploy, and scale voice agents for phone operations. It supports inbound and outbound calls, SMS/chat, and integrates with major AI model providers.

Who is Vapi built for?

Vapi is primarily designed for developers and engineering teams. It is used by teams at startups and Fortune 500 companies who need to deploy voice AI at scale.

How many calls has Vapi handled?

According to Vapi's public data, the platform has powered over 300 million calls and launched more than 2.5 million assistants across its developer base of 500,000+.

What programming languages does Vapi support?

Vapi offers SDKs in TypeScript and Python, along with cURL and a React web SDK, covering both server-side and client-side development.

What integrations does Vapi support?

Vapi integrates with over 40 applications. Documented integrations include OpenAI, Twilio, GitHub, and VS Code.

Is Vapi free to use?

New accounts receive $10 in free credit to start. There is no ongoing free tier. After the initial credit is used, usage is billed on a pay-as-you-go basis.

How much does Vapi cost?

Vapi hosting costs $0.05 per call minute and $0.005 per SMS/chat message on the Pay As You Go plan. Model provider costs (STT, LLM, TTS) are additional and billed at cost. Enterprise pricing is custom and requires contacting sales.

Does Vapi support HIPAA compliance?

HIPAA Zero Data Retention is available as an add-on on the Pay As You Go plan at $1,000 per month. Enterprise plans include compliance features as part of the contract.

What are the main complaints about Vapi?

Users report that the pricing structure can be difficult to understand because costs are split across multiple components. Expenses can also increase significantly at higher call volumes.

How does Vapi compare to building voice AI infrastructure in-house?

Users on G2 report that Vapi saves hundreds of engineering hours monthly, suggesting it reduces the overhead of managing telephony, speech models, and call routing independently.

Is Vapi rated well by users?

Vapi holds a 4.5 out of 5 rating on G2 based on 142 reviews.

Does Vapi support outbound calls?

Yes. Vapi supports both inbound and outbound call operations, and teams use it for use cases like outbound notifications, lead qualification, and appointment reminders.

What data retention does Vapi offer?

On the Pay As You Go plan, call history is retained for 14 days and chat history for 30 days. Enterprise plans offer custom data retention periods.

What support options does Vapi provide?

Pay As You Go users have access to community Discord and email support. Enterprise customers receive private Slack support, a named support engineer, an account manager, and a custom support SLA.

What are some alternatives to Vapi?

The dossier does not list specific alternatives. For comparison options, searching for voice AI agent platforms or developer-focused telephony APIs would surface comparable tools.