Compare Clerk vs. ZITADEL

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.

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.

Sumsub is a single verification platform that allows you to onboard more customers worldwide, speed up their access, reduce costs, and fight digital fraud. Sumsub combines effective verification flows with higher conversion rates worldwide through a powerful, all in one suite designed for a wide variety of needs: KYC/AML verification, KYB verifications, payment fraud prevention and face authentication.

1Password is a password manager that's secure, scalable, easy-to-use, and trusted by some of the most prestigious companies in the world. 1Password makes it easy to keep your employees safe online with its simple interface. Good security habits will become second nature once 1Password is a part of your employees' workflow. 1Password Advanced Protection now available with 1Password Business You can set Master Password policies, enforce two factor authentication across the entire team, limit access with firewall rules, review sign in attempts, and require that your team use the latest version 1Password. Our award-winning apps can be downloaded for Mac, iOS and Linux as well as Windows, Android, and Windows. 1Password syncs seamlessly between devices so that your employees have access to their passwords at all times. Your risk is reduced and your productivity increases when everyone uses 1Password.

MobiPDF (formerly PDF Extra) is an intuitive reader and editor that allows you to read, edit, create, OCR, organize, annotate, fill and sign, convert, and share any PDF. This makes MobiPDF an excellent choice for users seeking a budget-friendly alternative to Adobe Acrobat Pro. HERE’S WHAT YOU GET WITH MOBIPDF: Multiple Page View Modes: Enjoy a distraction-free "Read Mode". Advanced Editing Tools: Experience a Word-like PDF editing environment. Two-Way Conversions: Convert PDFs to and from Word, Excel, PowerPoint, or image formats. OCR Support: Make scanned documents searchable. Markup Tools: Highlight, comment, strikethrough, stamp, and more to enhance your documents. Effortless PDF Organizer: Reorder, compress, split, and combine PDFs with ease. Sign & Secure: Add signatures, create and fill forms, and protect your PDFs with passwords, encryption, and digital certificates. Offline Mode: Work freely on your projects, even offline. Seamless translation: One-click translate any PDF into 50+ languages.

Wrike is a powerful work management platform that gives cross-functional teams full visibility into complex projects. Our cloud-based collaboration software software is trusted by 20,000+ leading companies around the world, including tech giants such as Fitbit and Siemens. Wrike boasts a wide range of award-winning features, including dynamic request forms, automated workflows, cross-tagging, custom item types, and 400+ app integrations. Work smarter with Work Intelligence™: our advanced communication software that offers voice commands, smart replies, and document processing. We also offer tailor-made templates to help teams kick-start Agile projects and tick every box for compliance. As well as 99.9% uptime, our enterprise-grade security offers single sign-on, role-based access control, and continuous data backup. For extra peace of mind, you can use the Wrike Lock add-on and gain full ownership of your master encryption key. Wrike has been proven to make organizational processes 40% more efficient, eliminating time-consuming admin work and reducing costs across the board. Discover how it can benefit your team — start your free two-week trial today.

Clazar is the Enterprise Cloud GTM Management Platform designed for cloud Go-to-Market teams looking to unlock faster growth through AWS, Microsoft Azure, and Google Cloud marketplaces. Built to simplify and scale marketplace revenue, Clazar brings every step of the cloud commerce journey into a single unified system, from marketplace listing creation and offer management to co-selling execution, usage metering, invoicing, and revenue reconciliation. Cloud GTM teams can operationalize marketplace deals with zero manual overhead while accelerating sales cycles and improving financial accuracy. Clazar integrates seamlessly with Salesforce and HubSpot, allowing sales, partnerships, RevOps, and finance teams to manage marketplace and co-sell motions directly within their existing workflows. ISVs can quickly publish listings, generate private offers in minutes, automate approvals and governance processes, and manage contracts end-to-end without jumping between disconnected tools. With real-time dashboards and analytics, revenue teams gain complete visibility into pipeline performance, billing status, payouts, and cash flow across every cloud marketplace channel. Enterprise-ready by design, Clazar offers robust governance controls, industry-leading security compliance like SOC2 and ISO, and a powerful embedded automation builder to help organizations scale marketplace operations efficiently and confidently. Trusted by 300+ high-growth companies, including Supabase, Zapier, Pinecone, Replit, Perplexity, Confluent, and Secureframe, Clazar is the platform powering the next generation of cloud marketplace success.

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.

Cerberus FTP Server provides a secure and reliable file transfer solution for the demanding IT professional. 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.

Retool is a modern AI-native application development platform designed to help teams build internal software quickly and efficiently. It enables users to create agents, workflows, dashboards, and full-stack apps using natural language prompts and visual tools. Retool connects directly to databases, APIs, vector stores, and AI models to ensure applications work seamlessly with existing systems. The platform allows teams to transform raw data into actionable tools such as dashboards, admin panels, and monitoring systems. With drag-and-drop UI building, code-level customization, and AI-assisted generation, Retool supports multiple development styles. Built-in workflows automate complex processes while maintaining auditability and security. Retool fits naturally into standard engineering stacks with support for CI/CD and version control. Enterprise-grade permissions and hosting options ensure sensitive data stays protected. Used by thousands of companies worldwide, Retool helps teams ship AI-powered software faster. It bridges the gap between idea and production with speed and control.