WorkOS vs NextAuth.js (Auth.js)(2026)
WorkOS is better for teams that need free up to 1m mau. NextAuth.js (Auth.js) is the stronger choice if free and open source. WorkOS is freemium (from $0 (free up to 1M MAU)) and NextAuth.js (Auth.js) is free.
Full feature breakdown, pricing details, and pros & cons below.
By Bikram NathLast updated
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WorkOS
WorkOS provides enterprise-ready authentication APIs — SSO (SAML), SCIM, and Admin Portal in days, not months.
Starting at $0 (free up to 1M MAU)
Visit WorkOSNextAuth.js (Auth.js)
NextAuth.js is a complete authentication library for Next.js applications with adapters for 60+ databases and providers.
Visit NextAuth.js (Auth.js)How Do WorkOS and NextAuth.js (Auth.js) Compare on Features?
| Feature | WorkOS | NextAuth.js (Auth.js) |
|---|---|---|
| Pricing model | freemium | free |
| Starting price | $0 (free up to 1M MAU) | Free |
| SAML SSO | ✓ | — |
| SCIM provisioning | ✓ | — |
| Admin Portal | ✓ | — |
| Directory Sync | ✓ | — |
| MFA | ✓ | — |
| AuthKit | ✓ | — |
| 40+ OAuth providers | — | ✓ |
| Database adapters | — | ✓ |
| JWT sessions | — | ✓ |
| Email magic links | — | ✓ |
| Credentials auth | — | ✓ |
WorkOS Pros and Cons vs NextAuth.js (Auth.js)
WorkOS
NextAuth.js (Auth.js)
Deep dive: WorkOS
When to choose WorkOS
WorkOS is the clear winner for B2B SaaS launching enterprise features fast. If your target customer is a company (not individuals), and they demand SAML/SSO or SCIM directory sync, WorkOS gets you there in days, not months. The free tier covers 1M MAU, so you can launch without touching Stripe until you have real traction. Pick WorkOS if you need Admin Portal out-of-the-box—users can manage their own SSO settings without you writing a single dashboard page. Also choose WorkOS if you're building for regulated industries (healthcare, finance) where audit trails and SCIM compliance matter; their documentation is designed for compliance teams. Don't pick WorkOS for consumer apps, social login flows, or passwordless—they're purposefully omitted. WorkOS is also wrong if you need deep customization of the login experience; their UI is locked down by design to be enterprise-safe, not flashy. Skip it if you're already all-in on Auth0 ecosystems or need extensive community content and third-party integrations.
Real-world use case
A B2B SaaS founder with a $500k ARR baseline launched WorkOS in Week 1 to close enterprise deals. Two customers were asking for SAML; WorkOS closed that gap in 4 hours (vs. estimated 6 weeks to build). Monthly cost: $0 (under 1M MAU). The Admin Portal meant customers could self-manage SAML settings—reducing support tickets by 30 hours/month. One customer with 500 employees used SCIM to auto-provision accounts from Okta; WorkOS handled the directory sync without additional engineering. The co-founder spent 16 hours total on integration—mostly reading docs, not debugging. By month 4, they'd signed 3 enterprise deals ($80k ACV each) that required SSO. The financial outcome: $240k in incremental ARR from enterprise customers, with zero additional engineering headcount. The tradeoff: they lost flexibility—couldn't customize the login UI or add custom SAML attribute mapping. One customer asked for LDAP support; WorkOS doesn't offer it, and they had to decline the deal.
Hidden gotchas
WorkOS's Admin Portal looks great but has severe UX gaps. Enterprise customers trying to configure SAML often hit a cryptic 'Assertion not valid' error—the problem is buried in XML namespace mismatches, not documented anywhere in the UI. SCIM implementation has quirks: if a customer deletes a user in Okta, WorkOS doesn't automatically deprovision them from your app—you have to build the webhook handler and logic to match their behavior. The documentation assumes you've read SCIM specs (you probably haven't), so setup times double. Another trap: WorkOS bills on *unique* MAU monthly, meaning if you have 500k users and 2M logins, you're charged for 500k. But if you delete a user and re-import them next month, they're double-counted. A startup once hit a $10k surprise bill after a data migration script accidentally re-created 300k users. Enterprise pricing (for >1M MAU) is not publicly listed and requires sales calls—many founders hit this wall and discover their free-tier advantage evaporates. SSO session timeouts are also a gotcha: the default 24-hour session means enterprise users logging in the morning might be logged out by evening, which is not typical for enterprise apps. Finally, their API rate limits (1000 req/min) aren't well-advertised; a sync job pulling user metadata for 500k accounts might hit the limit and silently drop requests.
Pricing breakdown
WorkOS pricing is usage-based: User Management is free up to 1M MAU. SSO connections cost $125/mo per connection. Directory Sync is $125/mo per directory. SCIM provisioning is included with Directory Sync. The User Management free tier is the most generous in the auth space — no per-MAU fees at any scale. The cost for enterprise features is per-customer: if 5 enterprise customers need SSO, that is $625/mo. For a B2B SaaS adding enterprise auth, budget $125-500/mo per enterprise customer. The value: WorkOS abstracts SAML/OIDC complexity into a single API, saving 2-4 weeks of engineering time per SSO integration.
Deep dive: NextAuth.js (Auth.js)
When to choose NextAuth.js (Auth.js)
NextAuth.js (Auth.js) is the right call when the application is already on Next.js and the team wants full ownership of authentication data without paying a monthly fee per user. It fits projects where OAuth login via GitHub, Google, or Discord covers most of the user base, and where a developer comfortable reading source code can tolerate some configuration friction. It makes the most sense for teams that need a specific database adapter, say Prisma with PostgreSQL, and want sessions stored in their own schema rather than in a third-party vault. Teams that have strict data-residency requirements, especially in the EU, benefit from Auth.js because credentials never leave the infrastructure they control. It is also the pragmatic pick when budget is a hard constraint and Clerk or WorkOS pricing at around $25 to $99 per month plus per-user fees starts to matter at even modest scale. Auth.js is a poor fit when the team wants a prebuilt login UI with zero CSS work, when the app is not on Next.js or another supported framework like SvelteKit or Astro, or when the org needs enterprise SSO with SAML out of the box. In those cases, the setup overhead tilts the equation toward a managed service. Auth.js v5 introduced a major API change from v4, so teams inheriting older codebases should audit which version they are actually running before assuming current documentation applies.
Real-world use case
A solo developer building a project management SaaS targeting small agencies, around 50 to 300 users, chooses Auth.js with a Prisma adapter against a Neon PostgreSQL database. GitHub OAuth handles 80 percent of signups because the target users are technical. Magic link email covers the rest via Resend. The developer stores sessions in the database rather than JWTs to enable instant session revocation when a user cancels their subscription. Total auth infrastructure cost is zero dollars beyond what Neon and Resend already charge. The tradeoff is around two days of initial setup including schema migrations, callback URL configuration across development and production environments, and writing a custom middleware to gate routes by subscription tier. A managed service like Clerk would have reduced that to around four hours, but at $25 per month plus $0.02 per monthly active user above the free tier, the math flips somewhere around 200 active users compared to zero ongoing cost with Auth.js. The developer accepts the maintenance burden, knowing they need to handle Auth.js version upgrades manually and watch for breaking changes in the adapter layer.
Hidden gotchas
The edge runtime incompatibility is the most common production surprise. Next.js middleware runs on the edge by default, and Auth.js database adapters use Node.js APIs that are not available on the edge. The workaround is to use JWT sessions in middleware and only call the database adapter in server components or API routes, which means splitting session logic across two code paths. Teams that do not read the edge compatibility notes ship middleware that throws at runtime. The v4 to v5 migration renamed the package from next-auth to the auth.js monorepo and changed the configuration signature significantly. Any tutorial or Stack Overflow answer before late 2024 is likely showing v4 syntax, and mixing the two causes silent failures rather than clear errors. OAuth callback URL drift is another consistent pain point. When the NEXTAUTH_URL environment variable does not exactly match the registered callback URL in the OAuth provider's console, the redirect silently fails or loops. This is especially common when Vercel preview deployments generate dynamic URLs that were never registered with the provider. The session database schema that Auth.js generates does not include indexes on columns like userId in the sessions table. At around 10,000 or more sessions, queries for active sessions without those indexes produce noticeable latency. The adapter creates the schema but leaves index optimization to the developer. Finally, the Credentials provider intentionally disables automatic CSRF protection for API-based auth flows, and teams sometimes misread the documentation and omit their own CSRF or rate-limiting layer entirely, leaving login endpoints exposed to stuffing attacks.
Pricing breakdown
NextAuth (now Auth.js) is completely free and open-source under the ISC license. There are no paid tiers, no per-user fees, and no usage limits — you self-host it alongside your Next.js app. The real cost is engineering time: you need to provision and maintain your own database for session storage (Postgres/MySQL/MongoDB), handle email sending for magic links (Resend at $20/mo or AWS SES at ~$0.10 per 1,000 emails), and manage OAuth app registrations with each provider. Budget $0 for the library itself, $5-50/mo for database and email infrastructure depending on scale.
Should You Use WorkOS or NextAuth.js (Auth.js)?
For most teams, NextAuth.js (Auth.js) is the better default: it offers free and open source and is free. Choose WorkOS instead if free up to 1m mau matters more than more setup required. There is no universal winner — the right pick depends on your budget, team size, and whether you value free up to 1m mau or free and open source more.
Choose WorkOS if…
- •Free up to 1M MAU
- •Best enterprise SSO DX
- •Admin Portal included
Choose NextAuth.js (Auth.js) if…
- •Free and open source
- •No vendor lock-in
- •Highly flexible