Frontegg is a one-stop shop for authentication and user management needs, offering features such as customizable login boxes, enterprise Single Sign-On, multi-factor authentication, advanced security measures, and passwordless authentication. It provides a self-serve admin portal with team management, audit logs, webhook configurations, API token management, and subscription management. Frontegg's pricing is based on Monthly Active Users (MAU), with three plans: Launch (free forever for up to 7500 MAUs), Scale (custom pricing and unlimited MAUs, tenants, and SSO connections), and Enterprise (custom pricing with white-glove security, support, and infrastructure options). Auth0 is a comprehensive authentication platform that supports universal login, extensibility, security, developer-friendly integration, and passwordless authentication. Its pricing is also based on MAU, with plans starting at $35/Mo for B2C Essentials and $150/Mo for B2B Essentials. WorkOS is an all-in-one platform designed to help developers add enterprise support to their apps in a fast and scalable way, offering features such as Single Sign-On, Directory Sync, SCIM Provisioning, Admin Portal, Events API, user management, and audit logs. Its pricing is based on per-connection pricing, with custom domains available at a flat rate of $99/month. WorkOS is suitable for service providers looking to quickly add enterprise-grade identity features to their app, while Auth0 and Frontegg may be more suitable for companies in the B2B and B2C sectors.