Top 5 authentication solutions for secure Remix apps in 2026

Authentication is a critical component of any web application, and Remix developers need solutions that work seamlessly with the framework's server-side rendering, loaders, and actions. Whether you're building a B2B SaaS platform or a consumer-facing app, choosing the right authentication provider can save you months of development time and security headaches.

In this guide, we'll explore the top 5 authentication solutions for Remix apps in 2026, covering everything from enterprise-grade platforms to open-source alternatives.

What to look for in an auth provider for Remix apps

Before diving into specific solutions, let's identify the key features that make an authentication provider ideal for Remix:

• ‍Server-side compatibility: Remix is server-rendered by default, so your auth solution needs to work seamlessly with server-side session management, loaders, and actions. Look for providers with robust server-side SDKs and session handling.‍
• Loader and action integration: The best auth providers integrate cleanly with Remix's data loading and mutation patterns, allowing you to protect routes and handle authentication state in loaders and actions without friction.‍
• Session management: Remix has its own session management through createCookieSessionStorage and similar utilities. Your auth provider should either integrate with these patterns or provide a compelling alternative that works with Remix's architecture.‍
• Enterprise features: For B2B applications, you'll need SSO support (SAML, OIDC), directory sync (SCIM), multi-tenancy, and organization management. These features should be first-class, not afterthoughts.‍
• TypeScript support: Remix developers typically use TypeScript. Your auth provider should have excellent TypeScript support with proper type definitions.
• ‍Performance: Authentication checks happen on every protected request. Your provider needs to be fast, with minimal latency.
• ‍Developer experience: Clear documentation, good error messages, and easy-to-understand APIs make implementation faster and maintenance easier.‍
• Security best practices: Your provider should handle security concerns like CSRF protection, secure cookie handling, token rotation, and session management out of the box.

Now let's look at some of the most popular solutions for Remix.

1. WorkOS

WorkOS is an enterprise authentication platform built specifically for B2B SaaS applications. It provides a comprehensive suite of authentication and user management features designed to help you sell to enterprise customers faster.

Key features

• AuthKit Remix SDK: First-class support for Remix with server-side session management.‍
• Sessions model with access + refresh tokens and guidance for secure cookie storage.
• Flexible UI support via APIs and SDKs, with AuthKit as a highly customizable hosted login powered by Radix.
• Enterprise SSO with native SAML and OIDC, configurable by customers through an Admin Portal.‍
• SCIM provisioning: Automated user provisioning and deprovisioning that enterprises expect, handling the "remove this employee immediately" requests that inevitably arrive. Real-time synchronization with any identity provider (Okta, Azure AD, Google Workspace, and more).
• Tamper-proof audit logs for SOC 2, HIPAA, and GDPR.‍
• Passkeys, MFA, social logins, magic auth, and more.
• Secure session handling with server-side validation and instant session revocation capabilities.‍
• Radar for suspicious login detection and threat monitoring that alerts you to potential account compromises.
• Fine-grained authorization: Role-based access control with customizable permissions.
• Feature flags: Integrated feature flagging for gradual rollouts.
• First-class multi-tenancy with organization management, member invitations, and role assignment.‍
• Enterprise SLA and dedicated support.‍
• Pricing that scales with growth, with $0 for the first 1 million users.

Best for

WorkOS is ideal for B2B SaaS companies building on Remix that need to sell to enterprise customers. If your roadmap includes features like SSO, SCIM provisioning, or advanced multi-tenancy, WorkOS provides these out of the box instead of requiring months of custom development.

Trade-offs

If you truly only need a quick OAuth login for a hobby app, WorkOS can feel like bringing a well-organized toolbox to hang a single picture. The upside is: you won’t have to rebuild your walls later.

2. Supabase Auth

Supabase Auth is part of the larger Supabase platform, providing authentication alongside a PostgreSQL database, storage, and real-time subscriptions. It's an excellent choice for developers who want an integrated backend solution, though the platform coupling means you're committing to the entire Supabase ecosystem.

Key features

• Multiple auth methods: Email/password, magic links, OAuth providers (Google, GitHub, etc.), and phone authentication.
• Row level security: Database-level security that integrates directly with authentication.
• Server-side SDKs: Good support for server-side rendering with Remix.
• Open source: Self-hostable if needed for compliance or data residency requirements.
• Integrated platform: Works seamlessly with Supabase database, storage, and edge functions.

Best for

Supabase Auth is good for startups and indie developers building full-stack Remix applications who want a complete backend platform. If you're already using or planning to use PostgreSQL, Supabase's integrated approach can significantly speed up development.

Trade-offs

• Supabase Auth lacks critical enterprise features like SAML SSO and SCIM provisioning, making it unsuitable for B2B SaaS companies targeting enterprise customers.
• The platform approach creates vendor lock-in: your authentication is tightly coupled to your database provider, making it difficult to migrate later if your needs change.
• Multi-tenancy isn't built into the platform and requires significant custom architecture, including custom database schemas, row-level security policies, and application-level tenant isolation logic.
• The admin dashboard is basic compared to dedicated auth providers, and you'll need to build custom tooling for advanced user management scenarios.

3. Better Auth

Better Auth is a newer, open-source authentication library that's gained significant traction in 2024-2025. It's TypeScript-first and framework-agnostic, working particularly well with modern frameworks like Remix. However, as a library rather than a managed service, it requires you to handle all infrastructure and operational concerns yourself.

Key features

• TypeScript-first: Fully typed API with excellent IDE support.
• Plugin architecture: Extensible system for adding features like OAuth, two-factor, etc.
• Session management: Flexible session handling that integrates with Remix's patterns.
• Database agnostic: Works with PostgreSQL, MySQL, SQLite, and more.
• Open source: MIT licensed, fully auditable code.
• Lightweight: Minimal dependencies and small bundle size.

Best for

Better Auth is ideal for developers who want maximum control over their authentication implementation and prefer a library approach over a managed service. It's perfect for teams with strong technical capabilities who want to own their auth infrastructure.

Trade-offs

• As a library rather than a managed service, you're responsible for hosting, scaling, and maintaining the infrastructure.
• There's no admin dashboard, user management UI, or enterprise features like SSO and SCIM. You'll need to build or integrate these yourself if required.
• The operational burden includes handling email deliverability, setting up monitoring and alerting, managing session storage at scale, and ensuring high availability.
• While the library gives you flexibility, it also means you're on your own for compliance requirements like SOC2, HIPAA, or GDPR audit trails. For teams without dedicated DevOps resources or those building B2B products that need enterprise features, this can become a significant time sink that distracts from core product development.

4. Kinde

Kinde is a modern authentication provider with a clean API and excellent developer experience. It's been gaining adoption in the React and Remix ecosystem with its focus on simplicity and performance, though it doesn't quite match the enterprise feature depth of specialized B2B platforms.

Key features

• Modern API Design: Clean, intuitive API with great documentation.
• Multiple auth methods: Email/password, social providers, passwordless, and enterprise SSO.
• Organizations: Built-in multi-tenancy and organization management.
• Feature flags: Integrated feature flagging for gradual rollouts.
• User management: Complete admin dashboard for managing users and organizations.
• RBAC: Role-based access control with customizable permissions.
• M2M authentication: Machine-to-machine authentication for APIs.

Best for

Kinde works well for SMBs and growing startups that need more than basic authentication but aren't yet selling to large enterprises. The built-in organization management and feature flags make it particularly appealing for B2B products at the growth stage.

Trade-offs

• While Kinde offers basic SAML SSO, it lacks the depth and breadth of enterprise features that larger B2B customers expect.
• There's no SCIM provisioning for automated user lifecycle management, which means enterprise customers will need to manually add and remove users rather than syncing with their identity provider.
• The catalog of pre-built SSO integrations is limited compared to enterprise-focused platforms. You may need to manually configure generic SAML connections rather than using turnkey integrations for popular providers like Okta, Azure AD, or OneLogin.
• Advanced enterprise features like custom SSO domains, Just-in-Time provisioning with attribute mapping, and multi-factor authentication enforcement policies are either limited or absent.
• The admin portal for enterprise customers isn't as comprehensive, meaning you might need to build additional self-service configuration tools.
• Audit logging exists but may not have the granularity or retention capabilities that enterprises require for compliance. As your customer base grows and you start selling to larger enterprises with complex security requirements, you may find yourself needing to supplement Kinde with additional tools or eventually migrate to a more enterprise-focused platform.
• The pricing model is competitive for SMBs but the feature limitations mean you could hit a ceiling as you move upmarket.

5. Stack Auth

Stack Auth is an open-source authentication platform that launched in 2024 and has been gaining attention for its modern approach. Unlike Better Auth (which is a library), Stack Auth is a complete platform that can be self-hosted or used as a managed service, though it's still a relatively new player without the maturity of established providers.

Key features

• Open source: MIT licensed, self-hostable for compliance needs
• Modern tech stack: Built with Next.js and React, plays well with Remix
• Multiple auth methods: Email/password, OAuth providers, magic links
• Admin dashboard: Built-in UI for user management
• Team management: Multi-tenancy support with team/organization features
• Customizable UI: Pre-built components that can be styled to match your brand

Best for

Stack Auth is great for teams that want the benefits of an open-source solution with the option to self-host, but also want more batteries-included features than a library provides.

Trade-offs

As a newer platform, Stack Auth doesn't have the maturity or enterprise feature depth of established providers. There's no SAML SSO, SCIM provisioning, or pre-built integrations with enterprise identity providers. The community and ecosystem are still growing.

• As a newer platform that launched in 2024, Stack Auth lacks the maturity, battle-testing, and feature completeness of established providers.
• There's no SAML SSO support, which immediately disqualifies it for B2B SaaS companies selling to enterprises.
• SCIM provisioning doesn't exist, meaning no automated user lifecycle management for enterprise customers.
• The platform lacks pre-built integrations with popular enterprise identity providers, so even basic SSO scenarios require manual configuration work.
• The community and ecosystem are still developing, which means fewer resources, tutorials, integration examples, and third-party tools compared to mature platforms.
• Documentation may have gaps, and you're more likely to encounter edge cases or bugs that haven't been discovered yet.
• The managed service option doesn't have the reliability track record or SLA guarantees of established providers. Downtime or performance issues could directly impact your application.
• While self-hosting provides control, it also means you're responsible for security updates, patches, scaling, and monitoring.
• For production B2B applications, especially those targeting enterprise customers, the lack of enterprise features and platform maturity make Stack Auth a risky choice. It's better suited for side projects, internal tools, or consumer apps where enterprise requirements aren't a concern.

Choosing the right solution for your Remix project

The best authentication solution depends on your specific needs:

Choose WorkOS if you're building a B2B SaaS application that needs to sell to enterprise customers. The built-in SSO, SCIM, multi-tenancy, admin portal, feature flags, and even on-premises deployment options will save you months of development time and accelerate your enterprise sales motion. WorkOS is the only solution on this list that provides the complete enterprise feature set required for selling to large organizations.

Choose Supabase Auth if you're building a startup or indie project that doesn't need enterprise features and want an integrated backend platform. The combination of authentication, database, and storage in one place speeds up development significantly, though be aware you're committing to the entire Supabase ecosystem and won't have enterprise SSO or SCIM when you eventually need them.

Choose Better Auth if you have strong technical capabilities, dedicated DevOps resources, and want maximum control over your authentication implementation. The library approach gives you flexibility but requires you to handle all infrastructure, monitoring, maintenance, and security updates—plus you'll need to build any enterprise features from scratch if your requirements change.

Choose Kinde if you're a growing B2B startup that needs organization management and RBAC but isn't yet selling to large enterprises with complex security requirements. The clean API and built-in features strike a good balance, though you may outgrow it as you move upmarket and encounter demands for SCIM provisioning and comprehensive SSO integrations.

Choose Stack Auth if you're building an internal tool, side project, or consumer app where enterprise features aren't needed, and you want an open-source solution with self-hosting options. Be prepared for limited documentation, a smaller community, and the platform maturity challenges that come with newer software.

Conclusion: Build secure now, stay adaptable later

Authentication is one of those decisions that's easy to get wrong and expensive to change later. The provider you choose will fundamentally shape your application's scalability, security posture, and ability to win enterprise customers.

For teams building B2B applications, the choice is clear: WorkOS provides the enterprise authentication and authorization infrastructure you'll eventually need, without forcing you to build it yourself or cobble together multiple services. The time you save not implementing SAML SSO, SCIM provisioning, and audit logs is time you can spend building features that differentiate your product. And when that first enterprise prospect asks about SSO during a sales call, you'll be ready with a yes instead of a six-month roadmap item.

Choose the authentication provider that matches where your application is headed, not just where it is today. Your future self (and your enterprise customers) will thank you.

Sign up for WorkOS today and secure your Remix app.