AuthStack vs. ZITADEL 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.

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.

Frontegg is a Customer Identity and Access Management (CIAM) platform that simplifies authentication, authorization, and user management for SaaS companies. It enables developers to implement advanced identity features quickly, then shift ongoing administration to other teams. With Frontegg, Product, Infosec, and Customer Success teams can take control of key identity tasks like managing user roles, enforcing security policies, and handling customer requests, all without engineering support. Developers reduce toil and regain focus on core product work, while stakeholders move faster without bottlenecks. Frontegg supports modern identity features including SSO, MFA, role-based access control, entitlements, multi-tenancy, and audit logs. Its low-code platform integrates in days and provides a user-friendly admin portal that bridges technical and non-technical teams. Frontegg increases operational efficiency, improves security posture, and enhances the customer experience.

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.

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.

Cerberus FTP Server provides a secure and reliable file transfer solution for the demanding IT professional in any industry. Supporting SFTP and SCP, FTP/S, and HTTP/S, Cerberus is able to authenticate against Active Directory and LDAP, run as a Windows service, has native x64 support, includes a robust set of integrity and security features and offers an easy-to-use manager for controlling user access to files and file operations. - FTP/S, SCP, SFTP, HTTPS - SAML SSO - Active Directory & LDAP - Secure SSL Encryption - Two-Factor Authentication - IP Auto-Banning and Geoblocking - HIPAA Compliant - FIPS 140-2 Validated - Advanced Reporting - Comprehensive Auditing - Web File Transfer Client - Email Notifications - Event Support & Automation - File Retention Policies -Unlimited Connections -Virtual Directories -Users & Groups -Detailed Logs -Full IPv6 Support -FTP with TLS/SSL -SOAP control API -Web Administration -SSH2 SFTP and SCP -Public Key Authentication

Iru (formerly Kandji) is an all-in-one, AI-powered security and compliance platform designed to simplify IT management and strengthen enterprise protection. Built on the Iru Context Model, it unifies identity, endpoint, and compliance into a single intelligent system that understands users, devices, and applications in context. With passwordless workforce identity, advanced endpoint detection, and automated compliance, Iru delivers both security and efficiency without the complexity of multiple tools. Its integrated approach enables IT teams to secure access, prevent threats, and maintain continuous audit readiness—all from one intuitive platform. Trusted by over 5,000 companies including Plaid, Notion, Airbus, and Vercel, Iru transforms how modern businesses manage digital trust. The result is reduced IT workload, improved employee experience, and enterprise-grade protection built for the AI era.

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.

ZeroPath (YC S24) is an AI-native application security platform that delivers comprehensive code protection beyond traditional SAST. Founded by security engineers from Tesla and Google, ZeroPath combines large language models with advanced program analysis to find and automatically fix vulnerabilities. ZeroPath provides complete security coverage: 1. AI-powered SAST for business logic flaws & broken authentication 2. SCA with reachability analysis 3. Secrets detection and validation 4. Infrastructure as Code 5. Automated patch generation. any more... ZeroPath delivers 2x more real vulnerabilities with 75% fewer false positives. Our research team has been successful in finding vulns like critical account takeover in better-auth (CVE-2025-61928, 300k+ weekly downloads), identifying 170+ verified bugs in curl, and discovering 0-days in production systems at Netflix, Hulu, and Salesforce. Trusted by 750+ companies and performing 200k+ code scans monthly.