More than authentication —
Complete user management

Add sign up, sign in, and profile management to your application in minutes. Theme prebuilt frontends to match your branding, or customize everything with easy to use APIs.

Start building now
component previews

Optimized for React

Next.js logo
React logo

Everything you need

The features your users expect

Signing up and signing in are the first interactions users will have with your product. Delight them with the familiar features they have come to expect.

Email and SMS authentication

Give users a beautiful, secure login experience using emails or phone numbers.

Social Logins

Grant faster access with Google, Facebook, Github, Twitter and more.


Allow users to sign in to multiple accounts at once.

Passwordless authentication

Make passwords obsolete by sending Email Magic Links and One-time Password Codes (OTPs).

Multi Factor authentication

Encourage or require a second step during sign in.

Device management

Proactively notify users when a new device signs in.

Easy-to-use APIs

We obsess over every detail of our API definition, documentation, and helper libraries to ensure they are intuitive and developer-friendly. Plus, we follow the frontend-first methodology to allow for faster development directly from the client.

import { SignedIn, SignedOut, SignIn }
from "@clerk/clerk-react";
function Dashboard() {
return (
{/*User is signed in, show dashboard */}
{/* User is signed out, show sign-in flow */}
<SignIn />

Uncompromising security

From brute force and password leak detection to HTTP-only cookies and CSRF protection -- account security is our top priority and we're constantly iterating to better protect against threats.



Launch full-featured user management in minutes with our prebuilt UI, designed to maximize throughput and delight your users.

Sign up + sign in flows

Beautiful flows optimized for conversion and customized to your business needs.

// JSX
<SignIn />
<SignUp />
// Vanilla JS

User profile

A complete dashboard to empower your users to take control of their account security.

// JSX
<UserProfile />
// Vanilla JS
user profile

User button

A familiar button for displaying the current user, accessing account settings, and signing out.

// JSX
<UserButton />
// Vanilla JS

Demo: Deploy in 5 minutes

Watch as we add Clerk to a new Next.js application in just a few minutes.

It's great to see a service focus on taking away all the pain related to user management—not just login.

vercel ceo

Guillermo Rauch
CEO, Vercel

Working on account.php at Facebook was like being in a landmine field, and I love that Clerk’s User Profile solves that.

Ex-CTO, Dropbox & Early employee, Facebook

Adtiya Agrawal
Ex-CTO, Dropbox & Early employee, Facebook

Ready to see what Clerk can do for you?Start your free trial today

Start completely free with up to 500 monthly active users. No credit card required.

Start building now