> ## Documentation Index
> Fetch the complete documentation index at: https://docs.turnkey.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Learn how to set up, log in, or sign up easily in your Android app using the Turnkey Kotlin SDK.

export const FeatureCard = ({title, description, icon, logo, href}) => {
  return <a href={href} className="not-prose font-normal group ring-0 ring-transparent cursor-pointer block rounded-lg border border-zinc-950/10 dark:border-white/10 bg-white dark:bg-transparent p-5 no-underline hover:border-primary/40 transition-colors">
      <div className="tk-card-row">
        <span className="tk-card-icon-wrap">
          {logo ? <img src={`/images/networks/${logo}.svg`} className="tk-card-network-logo" alt="" /> : <span className="tk-card-icon" style={{
    maskImage: `url(/images/icons/${icon}.svg)`,
    WebkitMaskImage: `url(/images/icons/${icon}.svg)`
  }} />}
        </span>
        <div>
          <div className="font-semibold text-sm text-zinc-950 dark:text-white group-hover:text-primary transition-colors">
            {title}
          </div>
          {description && <div className="text-sm text-zinc-500 dark:text-zinc-400 mt-1">
              {description}
            </div>}
        </div>
      </div>
    </a>;
};

The Kotlin SDK makes authentication simple.
You can call specific login and signup functions to create your own UI components and authentication flow.

## Authentication state

To check if a user is authenticated, you can use the `authState` variable from the `TurnkeyContext`.

```kotlin theme={"system"}
val authState: AuthState = TurnkeyContext.authState.value
```

## Customize sub-organization creation

Need to configure default user names, passkey names, wallet creations or anything sub-org related?
You can learn more about customizing the sub-orgs you create in the [Sub-Organization Customization](/solutions/embedded-wallets/integration-guide/kotlin/sub-organization-customization) section.

Follow the guides below to learn how to set up email and SMS authentication, passkey authentication, and social logins in your Android app.

<div style={{display: 'grid', gridTemplateColumns: 'repeat(2, 1fr)', gap: '12px'}}>
  <FeatureCard title="Email & SMS" icon="lock-01" href="/solutions/embedded-wallets/integration-guide/kotlin/authentication/email-sms" description="Set up email and SMS authentication in your Android app." />

  <FeatureCard title="Passkey Authentication" icon="lock-01" href="/solutions/embedded-wallets/integration-guide/kotlin/authentication/passkey" description="Set up passkey authentication in your Android app." />

  <FeatureCard title="Social Logins" icon="lock-01" href="/solutions/embedded-wallets/integration-guide/kotlin/authentication/social-logins" description="Add social logins with wallet creation and account derivation in your Kotlin app." />

  <FeatureCard title="Relying party ID (rpId) setup" icon="lock-01" href="/solutions/embedded-wallets/integration-guide/kotlin/authentication/rp-id-setup" description="Set up the relying party ID for passkey authentication in your Android app." />
</div>