Open source user authentication that natively integrates into your app - enabling you to get started quickly while controlling the user and developer experience. Free for up to 5000 MAUs.

Enterprise SSO (SAML, OIDC), SCIM provisioning, and social logins for B2B SaaS. Free tier includes 1 million MAU, 100 organizations, 1 SSO connection, and 1 SCIM connection.

A Sell to companies of any size immediately with a few lines of code, free up to 200 users and 10k Transactional Emails (with a watermark branding: "Powered by PropelAuth").

Keycloak Open Source Identity and Access Management. Free realm up to 1000 users, up to 10 SSO connections, leveraging Phase Two's Keycloak enhanced container which includes the Organization extension.

Keycloak Identity and Access Management as a Service. Free up to 100 users and one realm.

Two-factor authentication (2FA) on multiple devices, with backups. Drop-in replacement for Google Authenticator. Free for up to 100 successful authentications.

Seamless Integration of SSO, MFA, passwordless auth and more. Includes SDKs for frontend and backend apps. Free up to 1000 MAUs and five identity providers.

Open-source API key management and rate-limiting platform. Free for up to 100,000 requests per month and 100 active API keys, with full access to key creation, revocation, and rate-limiting capabilities.

A turnkey user and access management that works for you and supports multi-tenant (B2B) use cases. Free for up to 25,000 authenticated requests, with all security features (no paywall for OTP, Passwordless, Policies, and so on). ⬆️ Back to Top

Free user management and authentication for up to 1 Million MAUs. Support email + password, social auth, Magic Auth, MFA, and more.

An all-in-one platform that provides APIs and SDKs for authentication and fraud prevention. The free plan includes 10,000 monthly active users, unlimited organizations, 5 SSO or SCIM connections, and 1,000 M2M tokens.

Open-source authentication that doesn't suck. The most developer-friendly solution, getting you started in just five minutes. Self-hostable for free, or offers a managed SaaS version with 10k free Monthly Active Users.

Auhtorization-as-a-service provider platform enabling RBAC, ABAC, and ReBAC for scalable microservices with real-time updates and a no-code policy UI. A 1000 Monthly Active User free tier.

AuthN/AuthZ/OAuth2.0/Zero Trust managed security platform. Forever free developer accounts with all security features, unlimited team members, 200 daily active users, and 25k/mo permission checks.

User management, authentication and authorization. Free for up to 100 monthly active users.

MojoAuth makes it easy to implement Passwordless authentication on your web, mobile, or any application in minutes.

Develop, secure, and manage user identities of your product - for both authentication and authorization. Free for up to 5,000 MAUs with open-source self-hosted option available.

Two-factor authentication (2FA) by push notifications, free for ten users, VPN, Websites, and SSH

Simple, robust authentication you can integrate with your product in minutes. Everything you need to get started with 7,500 free MAU.

Two-factor authentication (2FA) for website or app. Free for ten users, all authentication methods, unlimited, integrations, hardware tokens.

Highly customizable AuthN flows, has both a no-code and API/SDK approach, Free 7,500 active users/month, 50 tenants (up to 5 SAML/SSO tenants).

User management, authentication, 2FA/MFA, prebuilt UI components for sign-in, sign-up, user profiles, and more. Free plan includes unlimited applications, 50,000 MRU limit per app, 3 dashboard seats, and more.

A complete authorization management system for authoring, testing, and deploying access policies. Fine-grained authorization and access control, free up to 100 monthly active principals.

Authentication login and access control, unlimited identity providers for any project. Facebook, Google, Twitter and more. The first 1000 API calls are free.

Bring Passwordless, OTPs, 2FA, SSO to your apps in minutes. All Front-end included. Free up to 5000 MAUs.

Hosted SSO. The free plan includes 25,000 MAUs, unlimited Social Connections, a custom domain, and more.

Fine-grained authorization as a service for applications and APIs. Free up to 1000 MAUs and 100 authorizer instances.

A free tool to search a username across 90+ social platforms to find matching profiles.