Firebase Authentication Flutter

Firebase Authentication provides backend services, easy-to-use SDKs, and ready-made UI libraries to authenticate users to your app . It supports authentication using passwords, phone numbers, popular federated identity providers like Google, Facebook and Twitter, and more.

On the Blaze plan, Phone Authentication provides a no-cost tier . The first 10K verifications for both instances (USA, Canada, and India and All other countries) are provided at no cost each month. You are only charged on usage past this no-cost allotment. All other Firebase Auth features are no-cost on all plans.

The short answer is yes: by authenticating your users and writing security rules, you can fully restrict read / write access to your Firebase data . In a nutshell, Firebase security is enforced by server-side rules, that you author, and govern read or write access to given paths in your Firebase data tree.

Yes, you can use Firebase for auth only and link it to your own database .