# Getting Started

## Get Started

Cotter allows you to build a login system in just a few minutes. **There are 3 main methods of logging-in.** You can either choose 1 or combine the methods. 

Quickly get started with **our 5-minutes tutorials**:

💬 **Sign in with email/phone number:** Authenticate using a Magic Link or Verification Code. [Learn More  →](https://docs.cotter.app/features/verify-email-phone)

* [HTML Quickstart](https://docs.cotter.app/quickstart-guides/html-magic-link-with-email-and-phone)
* [React Quickstart](https://docs.cotter.app/quickstart-guides/react-magic-link-with-email-and-phone)
* [Next.js Tutorial](https://blog.cotter.app/passwordless-login-with-email-and-json-web-token-jwt-authentication-with-nextjs/)
* [Angular Tutorial](https://blog.cotter.app/angular-send-email-sms-and-whatsapp-verification-code-for-new-users-worldwide/)
* [Webflow Tutorial](https://blog.cotter.app/integrate-cotter-magic-link-to-webflow-in-less-than-15-minutes/)

🔐 **Sign In with Device on Mobile Apps:** Authenticate users based on the ownership of a device. [Learn More  →](https://docs.cotter.app/features/passwordless-login)

* [React Native Quickstart](https://docs.cotter.app/quickstart-guides/react-native-quickstart)
* [Flutter Quickstart](https://docs.cotter.app/quickstart-guides/flutter-sign-in-with-device)
* [iOS Quickstart](https://docs.cotter.app/quickstart-guides/ios-quickstart)

🧬 **Sign in with WebAuthn:** Authenticate users using TouchID/Windows Hello from your website. [Learn More  →](https://docs.cotter.app/features/sign-in-with-webauthn)

* [React Quickstart](https://docs.cotter.app/quickstart-guides/react-webauthn)

## Customization

Customize Cotter's Login Form from the [Dashboard > Branding](https://dev.cotter.app/). Currently this works for the Web SDKs for Sign in with Email/Phone using a Magic Link and OTP.

## Dig Deeper

Follow the full SDK reference for a fully customizable login flow and get OAuth 2.0 support for your API endpoints.

* [Web](https://docs.cotter.app/sdk-reference/web)
* [React Native](https://docs.cotter.app/sdk-reference/react-native)
* [Flutter](https://docs.cotter.app/sdk-reference/flutter)
* [iOS](https://docs.cotter.app/sdk-reference/ios)
* [Android](https://docs.cotter.app/sdk-reference/android)
* [Other Mobile App Frameworks](https://docs.cotter.app/sdk-reference/api-for-other-mobile-apps)
* [Backend: Handling Response](https://docs.cotter.app/sdk-reference/backend-handling-response) that you receive when a user authenticates

## OAuth 2.0: Get Access Token from Cotter

Cotter can generate OAuth Tokens (access token, id token, and refresh token) to be used for your APIs. This functionality is available from Cotter's SDK.

{% content-ref url="getting-access-token" %}
[getting-access-token](https://docs.cotter.app/getting-access-token)
{% endcontent-ref %}

## Example Apps

[HTML Example](https://codesandbox.io/s/client-side-working-example-hiy8w?file=/index.html)

[ReactNative Example App](https://github.com/cotterapp/react-native-sdk/tree/master/examples)

[Flutter Example App](https://github.com/cotterapp/flutter-sdk/tree/master/example)

[Android Example App](https://github.com/cotterapp/android-example)

[Biometric and PIN iOS Example](https://github.com/cotterapp/ios-sdk)