SmartAlex Documentation - AI Voice Assistant Platform

If you run a brokerage, a property team, or a solo agent business, the real question is not “which AI has the nicest voice.” It is “which one actually books viewings, captures the buyer who called at 9pm, and pushes that lead into a pipeline my team already works.” SmartAlex and VAPI answer that question very differently. This page is a straight comparison for real estate, including where VAPI is genuinely the better pick.

Short version: SmartAlex is a full business platform with a real estate plan, lead capture, booking, and campaigns already wired together. VAPI is a developer-first voice API you assemble into a product yourself. If you want to ship an inbound-and-outbound real estate setup this week, SmartAlex is faster. If you have engineers and want to hand-build every layer, VAPI gives you more raw control.

Who each one is for

Choose SmartAlex if

You want a working real estate voice assistant without gluing five products together. You value a booking flow, a deals pipeline, outbound nurture campaigns, and an embeddable website widget that already exist. You may want an AI assistant (Claude, ChatGPT, Cursor) to operate the account for you over MCP.

Choose VAPI if

You have developers and want to hand-assemble the stack: swap speech and language models independently, run a custom or self-hosted language model, build multi-agent squads, and wire your own CRM, calendar, and campaign logic through their client and server SDKs.

The comparison, capability by capability

We do not publish invented competitor benchmarks or per-minute prices here. VAPI bills per component (speech to text, language model, text to speech, plus telephony), so its blended cost depends on the stack you assemble. Check VAPI’s own pricing for current figures. For SmartAlex figures, see pricing.

Capability	SmartAlex	VAPI
Setup model	No-code Studio, plus auto-build an agent from a URL in under 60s	Code the agent through the API and SDKs
Real estate vertical plan	Yes, a dedicated Real Estate plan	None, you build the vertical yourself
Lead capture and CRM	Built-in contacts and a deals pipeline	Bring your own CRM
Viewing and showing bookings	Built-in calendar tools (Google Calendar, Calendly, custom iCal via Power Tools)	Wire your own function calls to a calendar
Outbound nurture campaigns	Outbound Campaigns add-on (scheduling, retries, disposition tracking)	Build the orchestration yourself
Website capture widget	Paste one script tag, or drop in a React component	Build a web client with the SDK
Programmatic control	Live 28-tool MCP server, plus Custom HTTP Tools	Rich client SDKs (Web, iOS, Android, React Native, Flutter) and server SDKs (Python, Node.js, Ruby)
Telephony	Managed for you	Bring your own carrier or SIP
Voice model choice	Curated, high-accuracy speech and voice models, kept abstracted	Swap speech and language models independently, custom language model support
Multi-agent squads	One active agent per widget config	Multi-agent squads
Analytics	Built-in dashboards	Build your own
Pricing shape	Predictable monthly plan plus included minutes	Per-minute plus components plus telephony

Both are strong tools. The honest divide is assembled-for-you versus assemble-it-yourself. VAPI’s documentation is among the deepest in the category, and its model-swapping and squad features are real advantages if you want to engineer a bespoke system. SmartAlex trades some of that low-level control for a platform that already does the real estate jobs below.

The three real estate jobs, and how each handles them

Inbound buyer and seller capture

The lead that calls after hours is the one you lose. With VAPI you would build the inbound agent, then separately build the place the captured lead lands and the logic that routes it. With SmartAlex, an inbound agent answers 24/7, asks whether the caller is buying or selling, captures name and contact, and writes a contact plus a deal into the pipeline automatically. Your website gets the same coverage: paste the widget and site visitors can talk or type to Alex without leaving the page.

Viewing and showing bookings

Booking is where a raw voice API shows the most assembly work. On SmartAlex, calendar booking is a built-in agent tool. With the Power Tools add-on ($29/month) the agent can reach Google Calendar, Calendly, or a custom iCal feed to offer real slots and confirm a viewing during the call. On VAPI you would implement the function calls, host the endpoint, and manage the calendar integration yourself.

Lead qualification

Real estate leads are only useful when qualified: budget, timeline, financing status, and target area. On SmartAlex you configure these as questions in Studio, the answers attach to the contact and deal, and the pipeline stage updates as the conversation progresses. On VAPI you define the extraction schema and function calls in code and persist the results into your own store.

Pricing shape for a real estate team

SmartAlex uses predictable monthly plans with included minutes, not per-minute assembly math. The Professional plan is $99/month with 250 included minutes, one number, and one agent. There is also a dedicated Real Estate plan ($3,000/month) built for higher-volume brokerages. The two add-ons most real estate teams reach for:

Outbound Campaigns, $49/month, for nurture and follow-up calling with scheduling and disposition tracking.
Power Tools, $29/month, which unlocks the calendar and payment tools, Custom HTTP Tools, and the Developer Portal where MCP API keys are issued.

See pricing and add-ons for current figures and what each plan includes. VAPI’s total cost is per-minute plus each model component plus your telephony, so compare on the specific stack you would assemble.

Operate the account with an AI assistant (MCP)

This is where SmartAlex leans into being agent-native. You can connect an AI client (Claude Code, Cursor, ChatGPT) to the live SmartAlex MCP server and drive the account in plain language: create the listing-inquiry agent, launch a follow-up campaign, check which viewings booked. Connect the hosted server with one command:

claude mcp add --transport http smartalex https://api.getsmartalex.com/functions/v1/mcp-server

Then prompt naturally:

“Create a real estate inbound agent that qualifies buyers by budget, area, and timeline, then books viewings on my Google Calendar.”
“Launch an Outbound Campaign to every contact in the pipeline that stalled at the viewing stage.”
“Show me which deals changed stage this week and the calls behind them.”

MCP keys are issued in the Developer Portal and require the Power Tools add-on plus a super-admin role. Full detail: MCP overview and getting started. The website widget is byte-identical across styles because it reads its published config from the server. Paste this just before the closing </body> tag on your site (Webflow, WordPress, Shopify, Wix, Squarespace, or any HTML page):

<!-- SmartAlex Widget -->
<script
  src="https://api.getsmartalex.com/storage/v1/object/public/widget-assets/smartalex-widget.js"
  data-tenant-id="YOUR_TENANT_ID"
  async>
</script>

For a Next.js listing site, inject it from the root layout instead:

import { useEffect } from 'react';

export default function Layout({ children }) {
  useEffect(() => {
    const script = document.createElement('script');
    script.src = 'https://api.getsmartalex.com/storage/v1/object/public/widget-assets/smartalex-widget.js';
    script.setAttribute('data-tenant-id', 'YOUR_TENANT_ID');
    script.async = true;
    document.body.appendChild(script);
    return () => { document.body.removeChild(script); };
  }, []);
  return <>{children}</>;
}

Your YOUR_TENANT_ID is shown in the widget code panel inside SmartAlex. Restyling the widget in Studio never requires re-pasting. Setup steps: widget install.

Where VAPI is the honest winner

Being fair matters. Pick VAPI over SmartAlex when you want to swap speech or language models independently, run a custom or self-hosted language model, build multi-agent squads with fine-grained routing, or ship native mobile voice with their client SDKs. VAPI is a developer’s toolkit, and if you have the engineering appetite to assemble the CRM, booking, and campaign layers yourself, it gives you more low-level control than a platform does.

Many real estate teams do not want to build those layers. They want the missed after-hours buyer captured, the viewing booked, and the lead in a pipeline their agents already work. That is the case where SmartAlex ships faster.

Real estate use case

How teams run inbound capture, bookings, and qualification on SmartAlex.

SmartAlex vs VAPI

The full platform comparison beyond real estate.

VAPI alternative

Why teams move from a raw voice API to a platform.

Best AI voice agent platforms

Where SmartAlex, VAPI, Retell, and others land.

SmartAlex vs VAPI for real estate (2026)

Who each one is for

Choose SmartAlex if

Choose VAPI if

The comparison, capability by capability

The three real estate jobs, and how each handles them

Inbound buyer and seller capture

Viewing and showing bookings

Lead qualification

Pricing shape for a real estate team

Operate the account with an AI assistant (MCP)

Put a capture widget on your listing site

Where VAPI is the honest winner

Real estate use case

SmartAlex vs VAPI

VAPI alternative

Best AI voice agent platforms

​Who each one is for

Choose SmartAlex if

Choose VAPI if

​The comparison, capability by capability

​The three real estate jobs, and how each handles them

​Inbound buyer and seller capture

​Viewing and showing bookings

​Lead qualification

​Pricing shape for a real estate team

​Operate the account with an AI assistant (MCP)

​Put a capture widget on your listing site

​Where VAPI is the honest winner

​Related

Real estate use case

SmartAlex vs VAPI

VAPI alternative

Best AI voice agent platforms

Who each one is for

The comparison, capability by capability

The three real estate jobs, and how each handles them

Inbound buyer and seller capture

Viewing and showing bookings

Lead qualification

Pricing shape for a real estate team

Operate the account with an AI assistant (MCP)

Put a capture widget on your listing site

Where VAPI is the honest winner

Related