AuthStack vs. authentik Comparison Chart

FusionAuth is a modern, developer-focused identity and access management platform built to give you full control over your authentication stack. Whether you’re building a startup app or managing enterprise-scale infrastructure, FusionAuth delivers all the must-have features — from login and SSO to advanced protocols like OAuth2, OIDC, SAML, and WebAuthn — in a self-hostable or cloud-native package. Designed with developers in mind, FusionAuth integrates seamlessly with any language, framework, or architecture. Every capability is API-first and built for extensibility, so you can tailor authentication workflows without getting locked into rigid, inflexible systems. FusionAuth supports all the key use cases — user registration, multi-factor authentication (MFA), passwordless login, role-based access control, and more — while helping you stay compliant with GDPR, HIPAA, PCI, and other regulatory standards.

Auth0 takes a modern approach to Identity, providing secure access to any application, for any user. Safeguarding billions of login transactions each month, Auth0 delivers convenience, privacy, and security so customers can focus on innovation. Auth0 is part of Okta, The World’s Identity Company™. Auth0 lets you quickly integrate authentication and authorization for web, mobile, and legacy applications, with new Fine Grained Authorization (FGA) that goes beyond role-based access control. Authenticate users across all applications with a customized, secure, and standards-based single login. Universal Login connects users to a central authorization server. Credentials aren’t transferred across sources, which boosts security and protects against phishing and credential stuffing attacks. OAuth 2.0 recommends that only external user agents (like the browser) be used by native applications for authentication flows. Auth0’s Universal Login achieves this while enabling SSO.

Cisco Duo is a cloud-based identity security solution that protects organizations from identity-based threats and boosts workforce productivity. Trusted by over 40,000 organizations worldwide, Duo delivers an exceptional access management experience across all users, devices, and applications, making access to resources secure, seamless, and easy. Duo with Cisco Identity Intelligence provides deep visibility across your identity ecosystem, adding a powerful security layer to any identity infrastructure. Offer users a world-class access experience through Duo Passport to eliminate MFA friction and fatigue without sacrificing security. To stop threats, Duo verifies user identities with strong authenticators including Duo passwordless, Verified Duo Push with number matching, and phishing-resistant factors like biometrics and FIDO2 security keys. Paired with deep insights into users’ devices, Duo gives you the control to adaptively limit access based on device health or user risk.

ADManager Plus is a simple, easy-to-use Windows Active Directory (AD) management and reporting solution that helps AD administrators and help desk technicians in their day-to-day activities. With a centralized and intuitive web-based GUI, the software handles a variety of complex tasks like bulk management of user accounts and other AD objects, delegates role-based access to help desk technicians, and generates an exhaustive list of AD reports, some of which are an essential requirement to satisfy compliance audits. This Active Directory tool also offers mobile AD apps that empower AD admins and technicians to perform important user management tasks, on the move, right from their mobile devices. Create multiple users and groups in Office 365, manage licenses, create Exchange mailboxes, migrate mailboxes, set storage limits, add proxy addresses, and more.

Keeper Security is transforming the way people and organizations around the world secure their passwords and passkeys, secrets and confidential information. Keeper’s easy-to-use cybersecurity platform is built on a foundation of zero-trust and zero-knowledge security to protect every user on every device. Keeper’s solution deploys in minutes and seamlessly integrates with any tech stack to prevent breaches, reduce help desk costs and ensure compliance. Trusted by millions of individuals and thousands of organizations globally, Keeper is the leader for best-in-class password and passkey management, secrets management, privileged access, secure remote access and encrypted messaging. Protect what matters at KeeperSecurity.com.

Uniqkey: Protect every login. Access with confidence. Uniqkey is Europe’s trusted password and access management platform - purpose-built for companies that demand security, simplicity, and control. Engineered by European cybersecurity experts, our platform combines military-grade encryption with an effortless user experience. We remove complexity from everyday workflows, helping employees stay secure without slowing them down. From auto-filling 2FA codes to streamlining access across your cloud environment, Uniqkey keeps security frictionless and productivity high. With real-time visibility across your entire infrastructure, IT teams gain complete control over access rights, employee activity, and security scores - empowering them to defend against threats and drive compliance with confidence proactively. Seamlessly integrated with Microsoft and other core systems, Uniqkey makes provisioning and offboarding fast, automated, and secure.

Veriam brings access and subscriptions together in one simple, secure solution. Our brand new platform makes it faster and simpler for SaaS providers to manage onboarding, access, contracting, renewals, and billing—all in one place. How Veriam stands out ✔️ All-in-one platform: Manage access and subscriptions from a single platform, reducing admin and improving workflows. ✔️ Real-time updates: Access permissions update instantly as subscription changes happen—no delays, no downtime. ✔️ Self-service controls: Customers manage their subscriptions, profiles, and access settings, reducing support tickets. ✔️ One login for customers: No password fatigue. Customers only need a single login to access products, subscriptions, and data from any organization using Veriam. ✔️ Security & Compliance: Fewer tools, fewer points of failure. Veriam meets industry standards, ensuring customer data is handled securely and privately. Try us out today!

AgeChecker.Net provides an easy checkout experience while keeping your site up to date with the latest age regulations in your industry. More than 90% of customers are verified instantly with our extensive database of trusted records and intelligent matching technology. Keep up to date with the latest FDA age requirements, state laws, and merchant account policies. Our verification rules are customizable. Reduce cart abandonment and customer frustration over competing systems. Customers are verified directly on your website during checkout. We are a real age verification solution, not just a pop-up! We match customer information from your checkout form against our identity networks to verify that a customer meets your minimum age requirements. All major e-commerce platforms are supported. When a customer is ready to place their order, the AgeChecker.Net popup will appear and explain the verification process and why it is required.

Authentication happens at some of the most important, and highly impactful, places in your customers' journey. Take control of user authorization with a passwordless authentication, social integrations, and enterprise SSO. Support the branding of all your customers with custom domains and a fully customisable UI by bringing your own pages and designs. Integrate with complex requirements and run your own code during authentication using our powerful workflows. Organise all your business customers using organizations to easily segergate them and fine tune the authentication experience to their individual needs. Monetize your ideas quickly with Kinde's billing tools. Create subscription plans and collect revenue effortlessly. Kinde adapts to your business model, supporting B2C, B2B, and B2B2C with robust organization management and flexible billing logic that scales with your customers.

ARGOS is an AI-powered Identity Platform. We revolutionize how the world experiences identity. We create essential identity services for people and businesses to ensure a secure digital ecosystem worldwide. We provide services to help you identify Anyone Anywhere Anytime! ARGOS’s ID check enables seamless remote identity verification for blockchain, gaming, virtual assets, e-commerce, and fintech. With 99.996%+ accuracy, it delivers facial recognition within a day, minimizing verification errors. Supporting IDs from 200+ countries, it uses Liveness technology to detect forged faces and documents for secure authentication. As an all-in-one solution, ID check combines essential verification engines, eliminating the need for separate integrations. Businesses can also customize features as needed. From data extraction to fraud prevention, ARGOS helps businesses enhance security, streamline operations, and prevent fraud efficiently. Grow your business with our service!