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Alex Spinov
Alex Spinov

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Clerk Has a Free Tier — Drop-In Authentication With 10K Monthly Active Users and Pre-Built UI

#javascript #webdev #api #tutorial

Auth0 is powerful but building the login UI is still on you. Clerk gives you the entire authentication experience — pre-built sign-in/sign-up components, user management dashboard, and multi-factor auth — with zero UI work.

10,000 monthly active users on the free plan. No credit card.

What You Get for Free

  • 10,000 monthly active users — enough for early-stage startups
  • Pre-built UI components — sign-in, sign-up, user profile, org switcher
  • Social login — Google, GitHub, Facebook, Apple, Microsoft
  • Passwordless — magic links, email OTP, SMS OTP
  • Multi-factor auth — TOTP, SMS, backup codes
  • Organizations — multi-tenancy with roles and permissions
  • Session management — automatic token rotation
  • Webhooks — user created, updated, deleted events
  • User management dashboard — admin panel included

Quick Start (Under 5 Minutes)

1. Install 

npm install @clerk/nextjs
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2. Add to Next.js 

// middleware.ts
import { clerkMiddleware } from "@clerk/nextjs/server";
export default clerkMiddleware();

// layout.tsx
import { ClerkProvider, SignInButton, UserButton } from "@clerk/nextjs";

export default function Layout({ children }) {
  return (
    <ClerkProvider>
      <header>
        <SignInButton />
        <UserButton />
      </header>
      {children}
    </ClerkProvider>
  );
}
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That is it. You now have:

  • A complete sign-in/sign-up flow
  • Google and GitHub login
  • User avatar with dropdown menu
  • Session management
  • Protected routes

3. Protect a Page 

import { auth } from "@clerk/nextjs/server";

export default async function Dashboard() {
  const { userId } = await auth();
  if (!userId) redirect("/sign-in");

  return <div>Welcome, {userId}</div>;
}
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4. React (Non-Next.js) 

npm install @clerk/clerk-react
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import { ClerkProvider, SignIn, useUser } from "@clerk/clerk-react";

function App() {
  return (
    <ClerkProvider publishableKey="pk_test_...">
      <Dashboard />
    </ClerkProvider>
  );
}

function Dashboard() {
  const { isSignedIn, user } = useUser();

  if (!isSignedIn) return <SignIn />;
  return <div>Hello, {user.firstName}!</div>;
}
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5. Backend Verification 

import { verifyToken } from "@clerk/backend";

// Verify JWT in any backend
const session = await verifyToken(token, {
  secretKey: process.env.CLERK_SECRET_KEY,
});
console.log(session.sub); // user ID
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Why Developers Choose Clerk Over Auth0

The key difference: Clerk gives you the UI for free. With Auth0, you get the auth engine but still need to build sign-in forms, user profile pages, and organization switchers yourself.

A startup founder told me: "We switched from Auth0 to Clerk and deleted 2,000 lines of custom auth UI code. The pre-built components matched our design system better than what we built ourselves."

Free Plan Limits

Feature Free Tier
Monthly Active Users 10,000
Social connections Unlimited
Pre-built UI Yes
Organizations 5
MFA Yes
Webhooks Yes
Custom domain No (paid)
SAML SSO No (paid)

The Bottom Line

If you are building a Next.js or React app and need auth — Clerk gets you from zero to complete authentication in under 10 minutes. The pre-built components are polished enough for production.

10K MAU means you will not pay until your startup is already growing.

Need to scrape data from authenticated sites? Check out my web scraping tools on Apify — handle any login flow automatically.

Building something custom? Email me at spinov001@gmail.com

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