One platform. One bill. Zero vendors to manage.
Vapi is a developer toolkit where you assemble your own AI phone agent from separate LLM, voice, and telephony providers. OnCallClerk gives you the finished agent. No vendors to manage, no code to write, no bills to reconcile.
Plans from $29/month · Live in 10 minutes · No engineering required
The hidden cost of building on Vapi
Vapi's per-minute fee is just one of four charges on every call. Here is what a typical Vapi deployment actually costs.
Vapi: 4 separate bills per call
Vapi platform fee
Per-minute charge for using the Vapi API
LLM provider (e.g. OpenAI)
Per-token charges for the AI model processing each conversation
Voice synthesis (e.g. ElevenLabs)
Per-character charges for converting AI responses to speech
Telephony (e.g. Twilio)
Per-minute charges for the actual phone connection
Total varies by call length, model choice, and voice provider. Hard to predict monthly spend.
OnCallClerk: 1 flat bill
$29/mo
Starting price, minutes included
- AI agent included
- Phone number included
- Transcripts + analytics included
- All integrations included
- Same price every month
No credit card required.
Vapi sells you parts. OnCallClerk gives you the agent.
Same underlying technology, very different jobs. One is an engineering toolkit. The other is a finished product you sign up for.
Vapi is the heavy lifting
Vapi hands you SDKs and APIs. You wire it together. You design the call flows, integrate the LLM, voice synthesis, and telephony providers, build a dashboard or UI yourself, handle errors and edge cases, source a phone number separately, and maintain it all over time.
- Phone number not included
- Separate bills for LLM, voice, telephony
- Transcripts, analytics, lead capture all DIY
- Engineering project, not a product
Powerful if you are building a voice AI product from scratch.
OnCallClerk is the full platform
One dashboard runs the whole agent. Phone number, transcripts, analytics, lead capture, appointment booking, billing, all included. Configure with clicks, or drop in via our API and webhooks if you want to. One-click integrations to the tools you already use.
- Dedicated phone number included
- One flat monthly price, no stacked invoices
- Transcripts, analytics, integrations out of the box
- API and webhooks if you want to go custom
Sign up today and your agent can be live before lunch.
Built for everyone
Developers
A working agent on day one, plus a REST API, webhooks, and an SDK when you need to extend it.
Business owners
No code, no engineering team. Configure your agent in a dashboard and your phone is answered today.
Agencies
White-label OnCallClerk and run AI phone agents for your clients under your own brand.
Setup, illustrated
import Vapi from '@vapi-ai/server-sdk'
const vapi = new Vapi({ apiKey: process.env.VAPI_KEY })
const agent = await vapi.assistants.create({
model: { provider: 'openai', model: 'gpt-4o', ... },
voice: { provider: 'elevenlabs', voiceId: '...' },
transcriber: { provider: 'deepgram', ... },
firstMessage: 'Hello, how can I help?',
serverUrl: 'https://your-app.com/webhook',
})
// then: provision a phone number from Twilio
// then: build the dashboard
// then: store transcripts
// then: handle billing across 4 providers
// then: maintain it allBusiness name
Greeting
Voice
Phone number
Same outcome. Two very different setup experiences.
Everything you need, included
From a phone number to transcripts to one-click integrations. Every piece of the stack ships in one product. No glue code required.
Every call answered, 24/7
Your AI agent picks up on the first ring. No voicemail, no hold music, no calls going to waste. Day shifts, nights, weekends, holidays.
Configure, or code
Set up through a visual dashboard. Business name, services, FAQs, call routing. Drop in via the API and SDK when you need custom logic.
Transcripts you can actually use
Every call transcribed automatically. Search conversations, review what callers asked, export the data. No transcript API to integrate.
Insight without a data team
Call volume, peak times, duration trends, and outcomes in your dashboard. Understand your call patterns without building a single report.
One-click integrations
Connect your calendar, CRM, helpdesk, and Slack from the dashboard. Webhooks and an API are available for anything we do not cover natively.
One price, no surprises
Flat monthly plans starting at $29/month. No per-minute charges, no separate LLM bills, no telephony invoices. Know your cost before the month starts.
Other Vapi alternatives
OnCallClerk is not the only option. Here are other platforms depending on what you need.
Developer-focused voice agent API. Similar to Vapi. Requires engineering resources but offers strong conversation design tools.
API platform for AI phone calls. Simpler API than Vapi but still requires development to deploy and manage.
Enterprise outbound sales AI. Best for high-volume sales teams, not general inbound call answering.
No-code AI receptionist from $29/mo. Closest direct peer to OnCallClerk on price; warm transfers and calendar booking gated to $99 tier.
Born at Google. Unlimited minutes priced per unique customer. SOC 2 / ISO 27001 / HIPAA. From $66/agent/mo.
Bilingual AI answering for US small businesses. From $49/mo. Calendar booking unlocks at the $149 Scale tier.
Multi-channel AI: voice + SMS + chatbot + CRM + emails. From $99/mo with shared credit pool overage.
EU-based AI for restaurants and beauty salons. WhatsApp, Instagram and voice in one inbox.
No-code voice AI with visual call flow builders. More hands-on than OnCallClerk but accessible to non-developers.
Common questions about Vapi vs. OnCallClerk
Why is Vapi so expensive for small businesses?
Vapi charges per minute of call time, but that is only the platform fee. You also pay separately for the LLM provider (like OpenAI), the voice synthesis provider, and the telephony provider. These four costs stack on every call. For a business receiving 100+ calls per month, the total can easily exceed several hundred dollars, and the bill is different every month. OnCallClerk charges one flat monthly fee starting at $29/month with minutes included.
Can I use OnCallClerk without any coding?
Yes. OnCallClerk is entirely no-code. You configure your AI phone agent through a visual dashboard: business information, caller FAQs, call routing, voice selection, and integrations. There are no API keys, SDKs, or deployment steps. Most businesses go live in under 10 minutes.
How is OnCallClerk different from Vapi?
Vapi is a developer toolkit that provides APIs, SDKs, and infrastructure for building custom voice AI applications. You choose and pay for each component separately (LLM, voice, telephony, platform). OnCallClerk is a finished product: you sign up, describe your business, and your AI phone agent starts answering calls. Dashboard, transcripts, analytics, phone number, and integrations are all included in one price.
What can OnCallClerk handle that Vapi cannot?
OnCallClerk and Vapi can handle similar call scenarios, but the difference is how. With OnCallClerk, features like transcripts, analytics, lead capture, appointment booking, and call transfers work immediately with zero setup. With Vapi, you build each of these features yourself using their APIs. If you need a phone agent for your business, OnCallClerk is ready now. If you need to build a custom voice app into your own product, Vapi gives you the components.
Can I switch from Vapi to OnCallClerk?
Yes. OnCallClerk is a standalone platform, so there is no migration needed. Sign up, configure your agent through the dashboard, and forward your existing business number to your new OnCallClerk number. You can be answering calls on OnCallClerk the same day.
Is Vapi better than OnCallClerk for developers?
For developers building custom voice applications, yes. Vapi offers more low-level control. You can pick your own LLM, voice provider, and telephony carrier, and build exactly the application you want. But for businesses that just need their phones answered by AI, that flexibility is unnecessary complexity. OnCallClerk gives you the end result without the engineering project.
Stop paying four bills for one phone agent
One platform, one price, one dashboard. Your AI phone agent answers calls in 10 minutes. No LLM invoices, no telephony charges, no engineering sprints.