Auth0 by Okta vs. Firebase

Auth0 by Okta

Auth0 is Okta's B2C identity management solution. It's an all-in-one package, with social login, bot detection, UI components, anonymous users, single-sign-on, MFA etc. The free tier comes with 7,500 MAUs. That said, it's relatively expensive and 20,000 MAUs will cost you $1400/month.

Firebase

Google's Firebase is an entire app development platform that's packed with features.It comes with storage, cloud functions, monitoring and, of course, user authentication. The free tier comes with 50,000 MAUs. Beyond that pricing start at $0.0055/MAU and goes down to as low as $0.0025/MAU as you scale to millions of users. Firebase authentication supports email and password auth, phone auth, magic links, two-factor authentication and social identity providers - mainly Google, Google Play Games, Facebook, Apple, Microsoft, Twitter, GitHub and OAuth access tokens.

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Pros
ItemVotesUpvote
Offers passwordless, social, and multifactor auth1
Extensive documentation and community support1
Breach detection and brute-force protection1
Cons
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Free tier has restrictions on active users and features1
Higher tiers can be expensive1
Pros
ItemVotesUpvote
Easy to use1
Low price per monthly active user1
Generous free tier1
Easy SMS authentication1
Cons
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