# Authentication Solutions & Tools for Any App

Passwords or [passwordless](/content/articles/authentication/how-passwordless-works/index.html), single sign-on or multi-factor, FusionAuth lets you authenticate in every way, with standards based authentication using Oauth2, OIDC, or SAML v2.

## At FusionAuth, Security, Privacy and Compliance is Our Priority

FusionAuth is enterprise-ready with world class [security](/content/articles/security/index.html), privacy, and compliance. It's our highest priority.

## Authentication, Anywhere & Anyhow

FusionAuth gives you quick and easy authentication for any type of application including web, mobile, desktop and console apps. Use FusionAuth's [OpenID Connect or SAML v2](/content/blog/saml-and-oidc-difference/index.html) login workflows, or build your own login experience using our APIs. Our [library of content](/content/articles/index.html) is here to help you along the way.

## Fully Customizable Auth System

We let you [customize everything](/content/docs/customize/look-and-feel/index.html). **EVERYTHING**. Login screens, user language, registration screens, emails, unlimited user custom fields, messages — you name it. It’s your application, so make the login experience completely yours.

### Registration And Sign-up Forms

### Emails and SMS Messages

### Login and Sign-In Forms

## Advanced Authentication Methods

Simple and secure user authentication options, complete with everything you need.

[Multi-Factor Authentication](/content/feature/multifactor-authentication/index.html)

[Magic Links](/content/feature/magic-links/index.html)

[Passkeys](/content/feature/passkeys/index.html)

## Connect With Everything

FusionAuth connects with other sources of user data, including LDAP and custom APIs. Authenticate against them forever or transparently migrate your data from external user data stores to FusionAuth.

### 20M+

Downloads

### 1,000+

Logins/sec Supported

### 99.99%

Uptime SLA

### 24/7

Engineer-led Support

## Complete Auth for Any App

FusionAuth is a complete solution with no sacrifices. We got this. Go build something awesome.

**API Driven**\
Use our customizable login flows or build your own experience on top of our APIs.\
[Explore Docs](/content/docs/lifecycle/authenticate-users/login-api/index.html) **Flexible Hosting**\
Host yourself or use our cloud. It's always your data.\
[Learn More](/content/platform/self-hosting/index.html)

## Never Switch Customer Auth Providers Again

Whether you are building your MVP or have hit hockey stick growth, FusionAuth is a complete auth solution with no sacrifices. We got this. Go build something awesome.