Amazon Cognito and Firebase both offer robust user authentication services with competitive pricing. Amazon Cognito integrates seamlessly with other AWS services and offers a generous free tier and low price per monthly active user. However, it has been criticized for confusing documentation and setup difficulties. Firebase, on the other hand, is part of Google's app development platform and is known for its ease of use, generous free tier, and support for multiple authentication methods including SMS authentication. The best choice depends on your specific needs, such as whether you prioritize ease of use or integration with AWS services.

Amazon Cognito is advantageous if you are already using AWS services, as it integrates seamlessly with the AWS ecosystem. It also offers a generous free tier and low pricing per monthly active user as you scale. However, it may require more effort to set up and understand due to its documentation.

Firebase stands out for its ease of use and integration with a suite of Google services. It supports a wide range of authentication methods, including email, password, phone, magic links, and social identity providers such as Google, Facebook, and Twitter. Firebase also offers a generous free tier and competitive pricing as you scale.

Firebase is Google's app development platform that offers a comprehensive suite of features, including storage, cloud functions, monitoring, and user authentication. It supports multiple authentication methods such as email and password, phone authentication, magic links, two-factor authentication, and social identity providers like Google, Facebook, Apple, Microsoft, Twitter, GitHub, and OAuth access tokens.

Pros of Firebase include its ease of use, low price per monthly active user, a generous free tier, and easy SMS authentication. Currently, there are no user-generated cons for Firebase.

The free tier for Firebase includes 50,000 monthly active users (MAUs). Beyond that, pricing starts at $0.0055 per MAU and can go as low as $0.0025 per MAU as you scale to millions of users.

Firebase supports multiple authentication methods, including email and password, phone authentication, magic links, two-factor authentication, and social identity providers such as Google, Google Play Games, Facebook, Apple, Microsoft, Twitter, GitHub, and OAuth access tokens.

The pros of Amazon Cognito include its generous free tier, low price per monthly active user, and seamless integration with the AWS ecosystem. However, users have reported that the documentation can be confusing and sometimes misleading, and setting up the service can be difficult.

Amazon Cognito is a user authentication service that is part of the AWS ecosystem. It allows users to sign up and sign in with federated identity providers like Facebook, Google, Apple, and Amazon. The service offers a free tier with 50,000 monthly active users (MAUs), and the cost for additional users starts at $0.0055 per MAU, decreasing as the number of users increases.

The main features of Amazon Cognito include integration with four federated identity providers (Facebook, Google, Apple, and Amazon), a generous free tier with 50,000 monthly active users, and competitive pricing that decreases as the number of users scales. It also integrates well with other AWS services, making it a comprehensive solution for user authentication within the AWS ecosystem.