⚡ Authentication in Spain

Authentication services enable developers to integrate third-party authentication into their websites and applications, allowing users to sign in with accounts from identity providers such as Google, Facebook, Apple, Microsoft, and Discord.

Spain is a Southern European country with a population of around 48 million people.

According to our statistics, authentication services are detected on 0.7% of websites from Spain.

⭐ Most Popular in 2026

The following chart shows the top authentication services in Spain in 2026, based on market share.

The most popular is Google Identity, which dominates the market with an overwhelming 51.3% share.
It is followed by Google Sign-In with 16.8% and Facebook Login with 15%.

Google Identity 51.3%
Google Sign-In 16.8%
Facebook Login 15%
Sign In with Apple 5.9%
Amazon Cognito 5.7%
Supabase 3.1%
Microsoft Identity Platform 2.8%
Firebase Authentication 2.2%
Auth0 1.9%
Microsoft Entra ID 1.4%
Keycloak 1.2%
Auth.js 1%
Netlify Identity 0.9%
Sign In with LinkedIn 0.3%

🚀 Highlights

Here is a list of the top services that are more popular in Spain than worldwide.
Differences between global and country rankings are shown in parentheses.

2. Google Sign-In ^(-1)
4. Sign In with Apple ^(-1)
5. Amazon Cognito ^(-3)
6. Supabase ^(-1)
8. Firebase Authentication ^(-2)
10. Microsoft Entra ID ^(-3)
12. Auth.js ^(-2)
13. Netlify Identity ^(-2)
14. Sign In with LinkedIn ^(-2)
15. Clerk ^(-2)

✨ Best Authentication Services

Below is a more detailed list of 15 authentication services used on sites from Spain, ranked by their market share.

Rank	Name	Market share
1	Google Identity Mountain View, California, United States A suite of services and APIs from Google that handles user sign-up, sign-in, and authorization across web and mobile apps. Free	51.3%
2	Google Sign-In Mountain View, California, United States A deprecated JavaScript library that has been superseded by Google Identity Services for Web. FreeLegacy	16.8%
3	Facebook Login Menlo Park, California, United States A convenient way for Facebook's billions of global users to log into your app or website. Free	15%
4	Sign In with Apple Cupertino, California, United States A service provided by Apple that allows users to sign in to apps and websites using their Apple IDs. $99/year	5.9%
5	Amazon Cognito Seattle, Washington, United States A user identity service by Amazon Web Services that lets you add user sign-up, sign-in, and access control to your web and mobile apps. Free tier$$$	5.7%
6	Supabase Singapore An open-source backend-as-a-service platform based on PostgreSQL. FreeOpen source$25+/month	3.1%
7	Microsoft Identity Platform Redmond, Washington, United States A cloud identity service that allows your users and customers to sign in to your applications using their Microsoft identities or social accounts. Free$6+/user/month	2.8%
8	Firebase Authentication Mountain View, California, United States A backend authentication service that enables applications to sign in users using email and password, third-party identity providers, email links, and phone numbers. Free tier$$$	2.2%
9	Auth0 San Francisco, California, United States A cloud-based identity and authentication management platform that allows developers to add authentication to their applications. Free$35+/month	1.9%
10	Microsoft Entra ID Redmond, Washington, United States A cloud-based identity and access management solution. Free$6+/user/month	1.4%
11	Keycloak San Francisco, California, United States An open-source identity and access management solution that provides user federation, strong authentication, user management, fine-grained authorization, and more. FreeOpen source	1.2%
12	Auth.js San Francisco, California, United States An open-source authentication solution that integrates with Next.js, Nuxt, Qwik, and other modern JavaScript frameworks to handle user sign-in, session management, and access control. FreeOpen source	1%
13	Netlify Identity San Francisco, California, United States A plug-and-play microservice for handling site functionalities like signups, logins, password recovery, user metadata, and roles. $99+/month	0.9%
14	Sign In with LinkedIn Mountain View, California, United States An authentication service that allows sites and applications to use the LinkedIn sign-in feature. Free	0.3%
15	Clerk San Francisco, California, United States An authentication and user management service for Next.js, Remix, Nuxt, React, Vue, and other frameworks. Free$25+/month	0.2%

👉 See Also

🌎 Authentication in other countries

Data is based on the analysis of 84,980 websites from Spain.
Statistics were last calculated on March 21, 2026.
For details, see our methodology and disclaimer.