User Authentication
Auth0
Free tier: unlimited logins for 7,000 active users/month, authentication with email/password and up to 2 social providers
Pros: lots of providers, great documentation, support passwordless authentication, UI provided, compatible with iOS Touch ID, offers welcome emails and tasks triggers
Limitations: active users are users who logged in the last 30 days
AWS Cognito
Free tier: 50,000 active users/month (active means at least one activity during a calendar month)
Pros: supports mobile and web apps, multiple authentication providers (Facebook, Twitter, Google,…)
Limitations: Cognito Sync (users data synchornization) is only included in the AWS 1 year free tier in the limit of 10GB storage and 1,000,000 sync operations/month
Firebase Authentication
Free tier: always free, unlimited users
Ionic Auth
Free tier: always free, unlimited users
Pros: offers multiple login providers (email, custom with in-app browser, Google, Facebook, Twitter, GitHub, Instagram, LinkedIn), provide forms
LoginRadius
Free tier: 1 Web or Mobile App, Standard Login, 3 Social Providers, Managed Auth Page, 5000 Monthly Active Users
Pros: Complete Authentication with Managed Login Page, full customization of the login page and prebuilt themes available, self-serve dashboard and documentation, transactional emails & template customization, SDKs of popular programming languages, and demos.
Limitations: active users are users who logged in the last 30 days.
MojoAuth
Free tier: Unlimited monthly active users, unlimited total users and unlimited monthly logins, email support (Basic: 48 hours response time), live chat support
Pros: Passwordless authentication with magic link login, email OTP login, and WebAuthn. Provides custom branding, user management, great documentation, SDKs of popular programming languages, and demos.
Limitations: 2 RPS authentication request for free tier
Okta
Free tier: Up to 7,000 monthly active users, Up to 10 custom apps, OAuth 2.0 & OpenID Connect.
Pros: Complete authentication, authorization and user management through their API, client libraries for multiple languages.
Ory
Free tier: always free, unlimited users, rate limit requests/minute
Pros: Open Source (Apache2), API first, support FIDO2/WebAuthn, SDKs for all languages, custom UI & flows cloud native
SuperTokens
Free tier: Self-hosted version is always free, unlimited users. The hosted cloud solution is free up to 5K monthly active users
Pros: Covers all primary methods of authentication and session management(including email/password, social, JWT, oAuth, etc.), lowest vendor lock-in, pre-built UI, quick to implement, easy to customize, feature segmentation
Limitations: None. Cloud and free/open-source solution both are identical
Exceeding the free tier: (Applicable to hosted cloud solution only) You can switch to open-source version without any limitations or you can upgrade to increase the monthly active users support
Visual Studio Mobile Center
Free tier: 10 mobile apps and 500 active users while in preview
Pros: offers multiple login providers (Azure Active Directory, Microsoft Account, Facebook, Google, Twitter), client libraries for iOS, Android, Cordova, Windows, Xamarin.Android, Xamarin.iOS, Xamarin.Forms), UI support
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