Hanko is an open-source authentication platform that provides user onboarding and login infrastructure for web applications. The platform is designed to be privacy-first and GDPR-compliant, hosted in Europe, and supports deployment either as a self-hosted solution or via Hanko Cloud, with no vendor lock-in. Hanko supports a wide range of authentication methods and login flow configurations, including: - Passkeys (FIDO2/WebAuthn-based passwordless authentication) - Passwords (optional) - Passcodes (email-based one-time codes) - OAuth / Social logins (third-party providers) - Two-factor authentication (2FA) - Email verification Developers can configure login flows to be passkeys-only, social-only, password-based with optional passkeys, or any combination of these methods. The platform is targeted at developers and software teams building web applications who need flexible, customizable authentication without building it from scratch. Hanko Elements are customizable, framework-agnostic Web Components that provide pre-built UI for login, user onboarding, and account/profile management. These components can be embedded directly into applications without redirecting users to external pages. Custom CSS support allows visual customization to match application branding. The platform offers a JavaScript SDK for further integration flexibility. Notable customers include SAP, Volt.io, and Papermark. Hanko positions itself as an open-source alternative to services such as Auth0 and Clerk, with a focus on passkey-first authentication.