AuthKit is an open source authentication UI built by Radix, designed for easy customization. It supports both hosted and headless builds, with sophisticated styling tools and support for custom domains. User Management is the backend platform handling email verification, account linking, bot blocking, organization modeling, and more. WorkOS aims to help SaaS companies build and scale faster to enterprise level, offering solutions like AuthKit and User Management. These platforms are used by many fast-growing SaaS businesses such as Vercel, Drata, Loom, Jasper, Webflow, and others.