Open source auth for your B2B app.

All the auth features you need, for any scale. Implement Tesseral with just a few lines of code.

Pre-built login UI

Ship your login page in minutes. Match styling to your brand. Customize how users can log in without extra code.

Enterprise connections

Integrate with all identity providers. Offer SAML single sign-on and SCIM programmatic provisioning.

"With Tesseral, we shipped advanced support for teams in days. Their SDKs are a breeze to work with and the product design is thoughtful and intentional, clearly developed for B2B SaaS by people who've been in the auth trenches. It's rare to find a tool this powerful and a team we trust to scale with us as we grow."

Samuel Barnholdt

Co-Founder and CTO, ion design (YC W24)

Fine-grained authorization

Manage user permissions. Design an access control policy for your app. Offer custom roles to your customers.

Role

Employee

expenses.pay_out

expenses.approve

Managed API keys

Authenticate API requests. Extend API access to your customers. Apply custom scopes to their permissions.

$ curl https://api.acme.ai/search?q=...
  -H X-Api-Key=acme_sk_...

Start Building

Use Tesseral with your favorite framework

Tesseral supports all major web frameworks. Use our SDKs to simplify implementation and ship faster.

Next.js DocsDocs

page.tsx

Next.js
React
Flask
Express.js
Go

import { TesseralProvider, getUser } from "@tesseral/tesseral-nextjs/serverside";

// app/layout.tsx
export default function RootLayout({ children }: { children: React.ReactNode }) {
  return (
    <html lang="en">
      <body>
        <TesseralProvider>{children}</TesseralProvider>
      </body>
    </html>
  );
}

// app/page.tsx
export default async function Page() {
  const user = await getUser(); 
  return <div>Howdy, {user.email}!</div>; 
}

Powerful auth for any scale. Engineered for security, designed for developer experience.

User impersonation

Help customers troubleshoot by assuming their accounts. See exactly what they see in your app.

SAML single sign-on

Integrate single sign-on (SSO) instantly with any major identity provider, such as Microsoft Entra or Okta.

SCIM provisioning

Empower your customers to provision, de-provision, and update users from any major identity provider.

Passkeys

Support phishing-resistant multi-factor authentication with touch ID, physical security keys, and more.

Webhooks

Receive real-time updates so you’re always in sync with Tesseral’s user management system.

Role-based access control

Design a fine-grained access control policy. Apply permissions checks to any user with just one line of code.

Managed API keys

Issue revocable, tightly-scoped keys that your customers or integration partners can use with your API endpoints.

Authenticator apps (TOTP)

Offer multi-factor authentication with apps like Microsoft Authenticator, Authy, or 1Password.

Got questions?

Speak with a founder directly.

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