Open Source Authentication Apps
Secure your apps with robust Authentication solutions! Explore password managers, MFA, SSO & more. Protect user data and simplify login processes.
Apps in Authentication
Language
License
DefGuard
Authentication · Networking · Security
Self-hosted secure remote access that unifies WireGuard VPN, identity management, and connection-level MFA in one open-source platform.
VoidAuth
Authentication · Security
Self-hosted SSO with OIDC, LDAP, passkeys, and proxy auth for your entire self-hosted stack
Cosmos-Server
Authentication · Security
All-in-one self-hosted home server with SmartShield anti-DDoS, Nebula mesh VPN, automatic HTTPS, and a 250-app marketplace — all secured behind a unified auth layer.
Bramble
Authentication · Password Manager · Security
Local-first, end-to-end encrypted password manager that syncs your vault directly between your own devices over a private peer-to-peer mesh — no server, no account, no cloud in the middle.
PrivateCaptcha
Authentication · Security
Privacy-first, self-hostable Proof-of-Work CAPTCHA for GDPR-compliant bot protection.
Ory Kratos
Authentication
API-first identity and user management that handles login, registration, MFA, and recovery so your application never has to.
Maybe
Authentication · Databases · Invoicing Finance
Self-hostable personal finance app that gives you full ownership of your financial data with a clean, minimal Rails-powered interface.
Space Cloud
Authentication · Devops
Kubernetes-native serverless platform that generates instant GraphQL and REST APIs for any database with built-in auth and real-time subscriptions
Warrant
Authentication · Security
A Google Zanzibar-inspired authorization service for defining, checking, and auditing fine-grained access control across your applications.
About Authentication
Authentication is the cornerstone of modern application security. It’s the process of confirming that a user is who they say they are before granting access to resources. Without robust authentication, applications are vulnerable to unauthorized access, data breaches, and a host of other security risks. This category encompasses a wide range of solutions designed to manage user identities, enforce access controls, and protect sensitive information. Crucially, it’s often paired with authorization (determining what a user can access) for complete security.
Types of apps within the Authentication category include password managers, multi-factor authentication (MFA) providers, social login services (allowing users to sign in with Google or Facebook accounts), passwordless authentication solutions (using biometrics, magic links, or WebAuthn), and comprehensive Identity Access Management (IAM) platforms. Single Sign-On (SSO) solutions also fall under this umbrella, streamlining user access across multiple applications.
Authentication matters because it directly impacts the security and usability of your applications. Common use cases include protecting user accounts in web and mobile apps, securing API access, verifying employee identities for internal systems (enterprise authentication), and complying with data privacy regulations (like GDPR or HIPAA). Implementing strong authentication protocols reduces the risk of account takeovers, data breaches, and fraud. Beyond security, a seamless authentication experience improves user satisfaction – nobody wants to remember dozens of complex passwords! Modern authentication solutions prioritize usability through features like MFA, passwordless login, and SSO.
