Supabase and Firebase both offer robust user authentication solutions, each with unique advantages. Supabase is an open-source alternative to Firebase and includes features like PostgreSQL's policy engine for fine-grained user access rules, and customizable authentication components for React. It supports a wide range of social login integrations and offers a free tier with 50,000 monthly active users. The Pro plan costs $25/month for 100,000 MAUs. Firebase, developed by Google, is known for its ease of use and low price per monthly active user. It supports various authentication methods, including email and password, phone, magic links, two-factor authentication, and multiple social identity providers. Firebase's free tier also includes 50,000 MAUs, with pricing starting at $0.0055/MAU beyond that and decreasing with scale. In summary, if you need an open-source solution with fine-grained access control and extensive social login options, Supabase may be better. However, if ease of use and cost per MAU are more critical, Firebase might be the better choice.

Firebase offers better scalability compared to Supabase. Firebase's pricing model is designed to become more cost-effective as you scale, starting at $0.0055 per monthly active user (MAU) and decreasing to as low as $0.0025 per MAU as you reach millions of users. This makes Firebase a more attractive option for applications expecting high user growth. Supabase, on the other hand, offers a free tier with 50,000 MAUs and a Pro plan at $25/month for 100,000 MAUs, with additional users costing $0.00325/MAU. While Supabase's pricing is competitive, Firebase's scalability and cost-effectiveness at higher user volumes are more advantageous for larger-scale applications.

Supabase offers more customization options for authentication compared to Firebase. Supabase provides a customizable authentication component for React and allows for fine-grained user access rules through PostgreSQL's policy engine. This level of customization can be particularly beneficial for developers looking to implement specific authentication workflows and access controls. Firebase, while easy to use, provides a more standardized set of authentication features, including support for email and password auth, phone auth, magic links, two-factor authentication, and social identity providers. Although Firebase offers a wide range of authentication methods, its customization options are not as extensive as those provided by Supabase.

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.

Supabase is an open-source alternative to Firebase, offering a complete app development platform that includes user authentication, cloud functions, APIs, a Postgres database, storage, vector embeddings, and other features.

Supabase offers a variety of features such as user authentication, cloud functions, APIs, a Postgres database, storage, and vector embeddings. It also includes PostgreSQL's policy engine for fine-grained user access rules, social login integrations, and a customizable authentication component for React.

Supabase offers social login integrations with Google, Facebook, GitHub, Azure (Microsoft), Gitlab, Twitter, Discord, and many more.

Yes, phone login and multi-factor authentication (MFA) can be added to Supabase through third-party SMS providers such as Twilio or Bird.

Supabase offers a free tier with 50,000 monthly active users (MAUs). The Pro plan is priced at $25 per month and includes 100,000 MAUs, with an additional cost of $0.00325 per MAU beyond that.