Compare Duende IdentityServer vs. OAuth

FusionAuth is the authentication and authorization platform engineered for developers who demand flexibility and control. Built from the ground up to integrate with any stack, every feature — from user registration to MFA and SSO — is exposed via a modern, well-documented API. Support for every major identity protocol is included out of the box: OIDC, SAML, OAuth2, JWT, passwordless login, social sign-on, and more. Whether you’re building a greenfield app or retrofitting auth into a legacy system, FusionAuth adapts to your use case — not the other way around. Need compliance? FusionAuth helps you meet GDPR, HIPAA, and COPPA standards quickly and reliably. Deploy it your way: install on Linux, Windows, macOS, Docker, or Kubernetes — or go with FusionAuth Cloud, our managed SaaS hosting. No black boxes. No vendor lock-in. Just powerful, customizable auth that works the way you do.

Auth0 takes a modern approach to Identity and enables organizations to provide secure access to any application, for any user. Auth0 is highly customizable, and simple yet flexible. Safeguarding billions of login transactions each month, Auth0 delivers convenience, privacy, and security so customers can focus on innovation. With Auth0, you can rapidly integrate authentication and authorization for web, mobile, and legacy applications, with new Fine Grained Authorization (FGA) that goes beyond role-based access control.

Frontegg is a modern Customer Identity and Access Management (CIAM) platform purpose-built for SaaS applications. It gives developers a robust, low-code toolkit to implement advanced identity features like multi-factor authentication (MFA), single sign-on (SSO), passwordless login, and role-based access control (RBAC) without spending weeks wiring up custom flows. Designed with developers in mind, Frontegg supports rapid integration via SDKs and APIs for Node.js, React, Python, and more. It includes built-in support for OpenID Connect, SAML, OAuth2, and Webhooks, and ships with pre-configured components for login, signup, user management, and organization hierarchies. Whether you're building multi-tenant apps, complex subscription logic, or entitlement enforcement, Frontegg scales with you. Beyond the initial integration, Frontegg offloads identity maintenance from engineering by enabling non-technical teams to manage identity-related tasks through a secure admin portal. Product, Infosec, and Customer Success teams can enforce security policies, manage users, configure auth flows, and respond to customer needs without dev involvement. Security teams can monitor and enforce identity compliance standards through real-time dashboards and built-in audit trails. Frontegg also ensures continuous updates to identity protocols, so developers don't have to worry about chasing evolving standards. Frontegg reduces developer toil, shortens go-to-market timelines, and keeps engineering focused on high-impact product work. All while maintaining the security, scalability, and flexibility required by modern SaaS platforms.

All-in-one platform for identity verification, fraud detection, and compliance. iDenfy uses a three-layer process to verify identity. This protects startups, financial services, gambling, streaming, ridesharing and other digital services against identity fraud. The process protects companies from the most dangerous forms of identity fraud. iDenfy offers a variety of fraud prevention services, including business verification, proxy detection and fraud scoring, AML screening, monitoring and AML screening, NFC verification and other fraud prevention services. iDenfy was founded before AML, GDPR, and fraud regulations were implemented. It pioneered the identity verification process. The company covers the entire ID verification process for users, combining AI biometric recognition with manual human checks to verify they are real users. Use our ID verification software to save up to 40% on identity verification services. Save up to 40% on identity verification costs by paying only for successful ID verification.

Authologic offers a single, unified API for all your digital identity needs. It's a global identity orchestration engine that seamlessly integrates the best verification tools—from e-IDs and biometrics to bank and government databases. Businesses worldwide use Authologic to accelerate customer and business onboarding, drastically cut down on fraud, and instantly meet complex KYC/KYB/AML compliance standards. B y unifying over 50 methods across 200+ countries with smart routing and automated fallbacks, it ensures uninterrupted, compliant verification without demanding constant process rebuilds. Backed by Y Combinator and holding licenses like PSD2 AISP and certifications like ISO 27001, Authologic is built for global scalability and security.

Josys is a next-generation Identity Governance and Administration (IGA) solution built to eliminate the manual burden of IT operations. Purpose-built for modern IT departments and Managed Service Providers (MSPs), the platform provides a unified view of the entire identity perimeter, spanning every user, app, and permission level. By turning complex governance into autonomous workflows, Josys handles everything from shadow IT discovery and license rightsizing to automated access audits and lifecycle management. The result is a more secure, cost-effective environment where operational efficiency is the standard, not the goal.

Guardz is the unified cybersecurity platform purpose-built for MSPs. We consolidate the essential security controls, including identities, endpoints, email, awareness, and more, into one AI-native framework designed for operational efficiency. Our identity-centric approach connects the dots across vectors, reducing the gaps that siloed tools leave behind so MSPs can respond to user risk in real time. With 24/7 AI + human-led MDR, Guardz utilizes agentic AI to triage at machine speed while expert analysts validate, mitigate, and guide response, giving MSPs scalable protection without adding headcount.

Iris provides integration-ready identity and cyber protection solutions that help organizations add powerful customer security capabilities directly into their existing products — without building from scratch. Designed for modern digital platforms, Iris makes it easy to embed identity protection into apps, portals, and customer experiences at scale. Identity Protection API Iris’ API suite delivers a multitude of protection solutions—including dark web monitoring & alerts, credit services, risk assessment tools, device protection, and more—into your platform. Teams can fully control the user experience, data flows, and customer journeys while leveraging Iris’ underlying technology and data aggregation. Micro-Experiences Prebuilt, customizable UI components that can be embedded directly into your application. These lightweight modules allow teams to quickly deploy identity protection features — such as alerts, dashboards, and monitoring tools — with minimal development effort. Built for flexibility, Iris supports multiple integration approaches, enrollment methods, and data handling models, so organizations can choose how information flows between users, their systems, and Iris. The platform is designed to scale across large user bases while maintaining strong security and performance standards. By making identity protection a native part of the user experience, Iris helps organizations increase engagement, strengthen trust, and deliver meaningful, always-on protection to their customers.

Iru AI reimagines enterprise security and IT management with a unified, AI-driven platform that eliminates tool fragmentation and operational overhead. At its core is the Iru Context Model, a dynamic intelligence layer that connects identity, endpoint, and compliance management into one cohesive ecosystem. The platform offers passwordless authentication, device-bound access policies, and real-time vulnerability detection—creating a trust fabric that safeguards every user and device. Iru’s endpoint suite integrates management, detection, and response capabilities across Apple, Windows, and Android environments for holistic protection. Its Compliance Automation engine continuously maps and updates controls, ensuring organizations remain audit-ready while accelerating deal cycles. By merging automation with contextual intelligence, Iru empowers IT and security teams to make faster, smarter decisions. Companies gain a consolidated view of their infrastructure, reducing zero-day exploit risks and boosting productivity across teams. With a 4.75/5 G2 rating and adoption by thousands of high-growth enterprises, Iru delivers a future-ready foundation for secure, intelligent business operations.

Securden Unified PAM is a comprehensive solution designed for privileged access security, enabling users to identify, store, categorize, share, manage, and monitor all privileged accounts, passwords, keys, documents, and various identities. This tool establishes a centralized system for managing passwords, automates procedures through approval workflows, governs access permissions, tracks and logs all interactions with essential IT resources, and promotes adherence to password security protocols. The primary components of Securden Unified PAM include modules for password management, privileged account oversight, secure remote access, application governance, endpoint privilege regulation, management of privileged sessions, and SSH key administration. Additionally, the platform is aligned with numerous compliance standards such as NIS2, DORA, NIST, PCI-DSS, HIPAA, and ISO-IEC 27001, ensuring rigorous security measures. Installation is generally rapid, often completed in mere minutes, and organizations can expect to have a fully operational privileged access management system set up in under a month using Securden Unified PAM. Furthermore, this efficiency allows businesses to quickly enhance their security posture while minimizing disruptions to their ongoing operations.