Clerk vs Auth0 vs Supabase: Pricing & DX Compared

Authentication is the first feature every SaaS builds and the last one any founder wants to think about.

Get it wrong and you leak user data. Get it right and nobody notices.

So the goal is simple: pick an auth provider saas teams can integrate in a day and never worry about again.

This guide compares five options for you: Clerk, Auth0, Supabase Auth, Firebase Auth, and Better Auth.

Each targets a different buyer.

Clerk optimises for developer experience on modern React frameworks. Auth0 optimises for enterprise compliance and SSO. Supabase Auth bundles auth with a full backend. Firebase Auth rides the Google Cloud ecosystem.

And Better Auth hands you the whole thing to self-host.

Every price and free-tier limit below was read off the vendor's own pricing page on August 15, 2026. Adoption figures come from the GitHub and npm APIs the same day.

And that check mattered more than usual here.

Two of the four free tiers on this page had moved since the last update. One of them by 5x. And a compliance answer flipped from no to yes.

Key Takeaways

If you remember nothing else:

• Clerk's free tier is 50,000 MRUs, not the 10,000 this guide used to say. It also bills MRUs (monthly recurring users), which is not the same metric as MAUs
• Auth0's free tier is now 25,000 MAUs, up from 7,000. That's a real change in its favour
• Clerk does offer a HIPAA BAA on Enterprise. This guide previously said it didn't
• Better Auth is now the most-installed auth library in this comparison: 6.41M weekly npm downloads against NextAuth's 5.81M
• Supabase Pro includes 100,000 MAUs for the $25/mo base, then $0.00325/MAU. Cheapest at scale by a wide margin
• Firebase still has the weakest DX for modern Next.js, and that hasn't changed
• At 50,000 users, Clerk, Supabase, Auth0 and Firebase are now all free. The pricing fight has moved up-market

Table of Contents

1. Quick Comparison
2. How We Evaluated
3. Clerk: The Developer Experience Leader
4. Auth0: The Enterprise Standard
5. Supabase Auth: The Full-Stack Bundle
6. Firebase Auth: The Google Ecosystem Play
7. Better Auth: The Self-Hosted Challenger
8. Pricing: The Real Math
9. Feature Deep Dive
10. Next.js Integration
11. The Decision Framework
12. Conclusion

Quick Comparison

Feature	Clerk	Auth0	Supabase Auth	Firebase Auth	Better Auth
Best For	Next.js SaaS, indie devs	Enterprise, B2B SaaS	Full-stack Supabase apps	Google Cloud projects	Teams who want to own auth
Free Tier	50,000 MRUs	25,000 MAUs	50,000 MAUs	50,000 MAUs	Free (self-hosted)
Cost After Free	$0.02/MRU + $25 base	Plan-based, from $35/mo	$0.00325/MAU	~$0.0055/MAU	Your infra only
Social Login	50+ providers	50+ providers	15+ providers	Major providers	20+ providers
MFA	TOTP, SMS, WebAuthn	TOTP, SMS, Duo, Adaptive	TOTP, Phone	SMS, TOTP	TOTP, WebAuthn (plugins)
SSO (SAML/OIDC)	Yes	Yes (enterprise-grade)	OIDC	Via Identity Platform	Via plugin
Passkeys	Yes	Yes	Yes	Yes	Yes (plugin)
Pre-built UI	Excellent (React components)	Good (Universal Login)	Basic (Studio)	Limited (FirebaseUI)	None (you build it)
RBAC	Native (Organizations)	Native (Actions/Rules)	Via Postgres RLS	Custom claims	Via plugin
SOC 2	Yes	Yes	Yes	Yes (via GCP)	Your responsibility
HIPAA	Yes (Enterprise BAA)	Yes (BAA available)	No	Yes (via GCP BAA)	Your responsibility
Next.js Support	Excellent (native)	Good (SDK)	Good (SSR package)	Fair (manual)	Excellent (framework-agnostic)

Quick verdict: Clerk wins on developer experience and Next.js integration. Auth0 wins on enterprise compliance and SSO.

Supabase Auth wins on cost at scale. And Better Auth wins if you want no vendor at all.

Firebase? It doesn't win on anything in particular any more. But it's fine if you're already on Google Cloud.

How We Evaluated

Five providers, six criteria:

Criteria	Weight	What We Measured
Pricing	25%	Free tier limits, per-user costs, hidden fees at scale
Developer Experience	25%	SDK quality, documentation, time to integrate
Feature Completeness	20%	MFA, SSO, RBAC, passkeys, magic links, user management
Next.js Integration	15%	App Router support, middleware, server components
Compliance	10%	SOC 2, HIPAA, GDPR, data residency
Scalability	5%	Rate limits, session management, multi-tenancy

A note on method. Feature and DX assessments come from vendor documentation, SDKs, and integration guides. Every price, free-tier limit, and compliance claim was verified against the vendor's own pricing or docs page on August 15, 2026, and adoption figures against the GitHub and npm APIs.

Why be specific about that? Because pricing in this category moves faster than anyone updates their blog posts. Two free tiers on this page changed since the last version, and both changes made the paid options cheaper, not more expensive.

Clerk: The Developer Experience Leader

What it is: An authentication platform built for React and Next.js. Pre-built UI components, server-side middleware, and a hosted user management dashboard.

Pricing: Free up to 50,000 MRUs on Hobby. Pro is $25/mo base ($20 billed annually), includes 50,000 MRUs, then $0.02/MRU.

What Clerk Does Well

The pre-built components are production-ready. Drop <SignIn /> and <UserButton /> into your app and you get a complete flow: social login, MFA, and email verification.

They're customisable with CSS and match modern SaaS design patterns.

And no other provider here comes close on polish.

Next.js integration is native, not bolted on. Clerk's middleware protects routes at the edge. The auth() helper works in Server Components, Server Actions, and API routes. currentUser() returns typed user data anywhere server-side.

So it feels like part of Next.js rather than something you wired in.

Organizations and RBAC are built in. Multi-tenant SaaS needs team management, role-based access, and invitation flows. Clerk ships all of it with pre-built UI for org switching, member management, and role assignment.

And building that from scratch elsewhere costs you weeks.

Passkeys and WebAuthn work out of the box. You get passwordless login, biometrics, and security keys with no extra configuration.

Two Corrections From Earlier Versions of This Guide

The free tier is 50,000, not 10,000. We previously said Clerk's free ceiling was 10,000 and criticised it for being "significantly below Supabase and Firebase at 50,000."

That's now wrong in both directions.

Clerk's Hobby plan allows you 50,000 MRUs per app. So it sits level with Supabase and Firebase rather than five times behind.

Clerk does offer a HIPAA BAA. It's on the Enterprise plan, alongside a 99.99% SLA and premium support. We previously told you to go to Auth0 or Firebase if you handle PHI. If Clerk otherwise fits, talk to their sales team first.

One thing to watch: Clerk bills MRUs, monthly recurring users, not MAUs. The definitions differ, so don't compare Clerk's 50,000 to Supabase's 50,000 as if they're the same unit. Model your own usage before assuming they're equivalent.

Where Clerk Falls Short

Vendor lock-in is real. The pre-built components and middleware create deep integration points.

So migrating off Clerk means you replace UI components, rewrite middleware, and move user data.

Excellent DX comes with switching costs. That's the trade.

Costs climb fast past the free tier. At $0.02/MRU, 100,000 users runs you about $1,025/mo.

Supabase does the same scale for $25.

Auth0: The Enterprise Standard

What it is: An identity platform, now part of Okta, built for enterprise authentication and authorization. It handles SSO configurations, adaptive MFA, and compliance requirements smaller providers can't match.

Pricing: Free up to 25,000 MAUs. Paid plans start at $35/mo (Essentials B2C) and $150/mo (Essentials B2B). Professional runs $240/mo (B2C) and $800/mo (B2B). Enterprise is custom.

What Auth0 Does Well

Enterprise SSO is unmatched. SAML, OIDC, WS-Federation, and LDAP with deep configuration. Setting up SSO for customers on Okta, Azure AD, or Google Workspace is straightforward.

So if you're B2B and need to close enterprise deals, that one feature justifies the cost.

Adaptive MFA adds intelligence. Risk-based authentication reads login context — device, location, behaviour — and adjusts MFA requirements on the fly. Low-risk logins skip the prompt. High-risk ones get extra verification.

Compliance coverage is the broadest. SOC 2 Type 2, HIPAA BAA, GDPR, and data residency across multiple regions.

Selling into healthcare, finance, or government? Then Auth0 checks every box you'll be asked about.

Actions let you run custom logic. Enrich tokens, block suspicious logins, sync users to external systems, enforce custom policies — all inside the authentication pipeline. No one else here offers that depth.

Correction from earlier versions of this guide: did you rule Auth0 out on its free tier? It's 25,000 MAUs now, not 7,000.

That's a meaningful change.

Auth0 used to be the provider you outgrew fastest on the free plan. Now it sits within striking distance of the others.

So the old "you'll hit the paywall at 7,000 users" objection no longer holds against it.

Where Auth0 Falls Short

It's still the expensive option. The old "$0.07/MAU" framing in this guide was misleading because Auth0 doesn't price that way any more. It's plan-based, and the B2B plans in particular jump quickly: $150/mo for Essentials, $800/mo for Professional.

So model your actual tier before you budget. Per-user math will mislead you here.

Developer experience lags Clerk. The SDKs are robust but verbose.

Integrating into a Next.js App Router project needs more boilerplate, manual route guards, and configuration from you. And the documentation is comprehensive but dense.

Pricing tiers are confusing. The B2B/B2C split crossed with Essentials/Professional/Enterprise, plus feature gating per plan, makes it genuinely hard to work out what you'll pay.

Supabase Auth: The Full-Stack Bundle

What it is: Authentication bundled with Supabase's open-source backend. It integrates directly with PostgreSQL Row Level Security, creating one unified auth-to-data model.

Pricing: Free up to 50,000 MAUs. Pro is $25/mo and includes 100,000 MAUs, then $0.00325/MAU.

What Supabase Auth Does Well

The price-to-value ratio is still unbeatable. 50,000 free MAUs, and the $25 Pro plan covers you to 100,000 before per-user pricing starts.

So a SaaS at 100,000 users pays $25/mo for the entire Supabase stack.

Not $25 for auth. For everything.

Row Level Security creates real data protection. Auth tokens feed straight into Postgres RLS policies. Write "users can only read their own rows" and the database enforces it at query level.

No middleware. No application code.

And no chance of you accidentally leaking another user's data.

The platform is open source. You can self-host if you need full control. Along with Better Auth, it's one of only two genuine self-hosting options here.

Edge and serverless support is solid. The @supabase/ssr package handles cookie-based sessions across Server Components, middleware, and API routes.

Where Supabase Auth Falls Short

Enterprise SSO is limited. OIDC is supported, but the deep SAML configuration and IdP management Auth0 offers isn't there. Closing enterprise deals? This may not check the box.

Pre-built UI is basic. You get auth helpers and a Studio dashboard, but no drop-in React components.

So you build your own sign-in and sign-up forms. And that's development time Clerk would have eliminated for you.

No HIPAA BAA. Handling protected health information? Then this one is out for you.

Auth0, Firebase, or Clerk Enterprise are your options instead.

Auth is tied to the ecosystem. You can run Supabase Auth standalone, but the value is in the database integration. Not using Supabase for data? It's harder to justify over Clerk.

Firebase Auth: The Google Ecosystem Play

What it is: Google's authentication service, part of Firebase. Email/password, social login, phone auth, and anonymous auth on Google Cloud infrastructure.

Pricing: Free up to 50,000 MAUs. Roughly $0.0055/MAU from 50,001 to 100,000, with rates tiering down above that.

What Firebase Auth Does Well

The free tier is genuinely generous. You get 50,000 MAUs at zero cost, with no feature restrictions on core auth.

Google Cloud integration is seamless. Running on Firestore, Cloud Functions, and Cloud Run? Identity flows through the whole stack without extra configuration.

Phone authentication works globally. SMS verification across 200+ countries with reliable delivery. If phone-based auth is how your market signs up, Firebase handles the carrier mess for you.

Identity Platform adds enterprise features. Upgrading unlocks SAML, OIDC, multi-tenancy, and blocking functions. There's a real path from simple to enterprise.

Where Firebase Auth Falls Short

Token management is manual. ID tokens expire after an hour, and handling refresh in Next.js is your problem.

Clerk does this automatically. Firebase makes you build it.

The React/Next.js DX is dated. The SDKs are JavaScript-first, not React-first. No pre-built components, no Next.js middleware, no server-side helpers for App Router.

And that gap has widened, not narrowed. Everyone else on this list shipped App Router support while Firebase didn't.

Pricing surprises on Blaze. Auth events trigger Firestore reads and Cloud Function invocations that land on your Google Cloud bill. Budget 20-40% above the raw per-MAU number.

Vendor lock-in to Google Cloud. Migrating off means you extract user data, rebuild flows, and possibly re-architect your backend.

Better Auth: The Self-Hosted Challenger

What it is: An open-source, framework-agnostic authentication library for TypeScript. You run it on your own infrastructure against your own database. There's no vendor, no per-user bill, and no hosted dashboard.

Pricing: Free. Your only cost is the infrastructure you already run.
GitHub Stars: 29,547 | npm Downloads: 6.41M/week

Why It's New on This List

It's now the most-installed option in this comparison. 6.41 million weekly npm downloads puts Better Auth ahead of NextAuth/Auth.js at 5.81 million.

And well ahead of @clerk/nextjs at 2.01 million.

So that's a genuine shift in where the ecosystem is heading. Leaving it out of a 2026 auth comparison would be a hole.

The boilerplates have already moved. Both Supastarter and Achromatic ship Better Auth as their default. When the templates people buy to save time pick a default, that's a strong signal about where the defaults are going.

No per-user pricing, ever. At 500,000 users you pay for a database and some compute.

What would Clerk cost you at that scale? Roughly $9,025/mo.

It's genuinely framework-agnostic. Next.js, SvelteKit, Nuxt, Astro, Remix.

The core doesn't assume React. And that matters if you're not all-in on one framework.

The plugin system covers the gaps. Passkeys, 2FA, organizations, magic links, and SSO are plugins rather than core.

So you install what you need and skip the rest.

Where Better Auth Falls Short

Every non-code responsibility is yours. SOC 2, HIPAA, uptime, incident response, security patching, breach disclosure.

A hosted provider absorbs all of that. Better Auth hands it back to you.

So if compliance paperwork is part of your sales process, factor in what that costs you in time and audit fees. It may erase the savings.

There's no pre-built UI at all. Not "basic" like Supabase. None. You build every screen.

It's young. Fewer battle-tested deployments than Auth0 has years.

And fewer Stack Overflow answers when you hit an edge case.

Best for: Teams with the engineering capacity to own their auth layer, products where per-user pricing would eventually hurt, and anyone who wants zero vendor lock-in.

Pricing: The Real Math

Cost is the most common filter in an auth provider saas evaluation. Here's what each actually costs, using the figures verified on August 15, 2026.

Cost at Scale

Users	Clerk	Auth0	Supabase Auth	Firebase Auth	Better Auth
1,000	Free	Free	Free	Free	Infra only
10,000	Free	Free	Free	Free	Infra only
25,000	Free	Free	Free	Free	Infra only
50,000	Free	From $35/mo	Free	Free	Infra only
100,000	~$1,025/mo	Plan-dependent	$25/mo	~$275/mo	Infra only
250,000	~$4,025/mo	Custom	~$513/mo	Tiered, see GCP	Infra only

How to read this. Clerk is $25 base plus $0.02 per MRU above 50,000.

Supabase Pro is $25 and includes 100,000 MAUs, then $0.00325/MAU. And Firebase is $0.0055/MAU from 50,001 to 100,000, with rates tiering down above that, so we haven't guessed at 250,000.

Auth0 deliberately shows plan prices rather than per-user math, because Auth0 no longer prices per user.

Your cost depends on your tier and whether you're B2B or B2C. So use their calculator.

And notice the top half of that table. At 50,000 users, four of the five are free.

So the free-tier war is over, and you won it.

The pricing fight has moved to the 100,000+ range, where the spread is enormous: $25 for Supabase against roughly $1,025 for Clerk.

The Hidden Costs

Clerk: Per-MRU cost is straightforward with no hidden fees. SMS verification for phone MFA costs extra.

Auth0: Enterprise SSO connections, custom domains, and advanced compliance sit on higher tiers. Budget 2-3x your base estimate for enterprise features.

Supabase Auth: The $25 Pro fee includes database, storage, and edge functions. So auth is effectively free on infrastructure you'd pay for anyway.

Your real cost is the engineering time you spend building auth UI.

Firebase Auth: The free tier is real, but auth events trigger Firestore reads and Cloud Function invocations on your GCP bill. True cost runs 20-40% above the raw per-MAU calculation.

Better Auth: No licence cost, but you absorb compliance, uptime, and security maintenance.

Need SOC 2? The audit alone can cost you more than several years of Clerk bills.

Feature Deep Dive

Multi-Factor Authentication

MFA Type	Clerk	Auth0	Supabase Auth	Firebase Auth	Better Auth
TOTP (Authenticator apps)	Yes	Yes	Yes	Yes	Yes (plugin)
SMS	Yes	Yes	Yes (Phone)	Yes	Via provider
WebAuthn / Passkeys	Yes	Yes	Yes	Yes	Yes (plugin)
Adaptive / Risk-based	No	Yes	No	No	No
Duo Integration	No	Yes	No	No	No

Auth0's adaptive MFA is the most sophisticated here. Clerk covers every method most SaaS products need.

Supabase and Firebase cover the basics. Better Auth covers them too, but you assemble the plugins yourself.

Enterprise SSO

SSO Feature	Clerk	Auth0	Supabase Auth	Firebase Auth	Better Auth
SAML	Yes	Yes (deep config)	Limited	Via Identity Platform	Via plugin
OIDC	Yes	Yes	Yes	Via Identity Platform	Via plugin
Custom IdP connections	Yes	Yes (extensive)	Limited	Limited	Manual
Per-org SSO config	Yes	Yes	No	No	Manual

Auth0 remains the clear winner for enterprise SSO. Clerk covers the common cases well.

The rest need workarounds, upgrades, or your own implementation.

User Management

Clerk gives you the best user management experience: a hosted dashboard, pre-built profile components, and organization management.

Auth0 offers Universal Login and a management dashboard. Supabase has Studio. Firebase has the console.

And Better Auth has nothing. You build your own admin UI.

So if you want to ship user management without building admin screens, Clerk saves you weeks against every alternative here.

Next.js Integration

For SaaS built with Next.js, which is most new SaaS deploying to Vercel or Railway, integration quality matters as much as the feature list.

Clerk with Next.js

The tightest Next.js integration of any provider here:

• Middleware: clerkMiddleware() protects routes at the edge with zero configuration
• Server Components: auth() and currentUser() work directly in RSCs
• Server Actions: Full auth context inside "use server" functions
• Pre-built components: <SignIn />, <SignUp />, <UserButton />, <OrganizationSwitcher /> drop into any page
• App Router: First-class support, no workarounds

Integration time: about 30 minutes to a working auth system.

Auth0 with Next.js

SDK-based, and more manual:

• SDK: @auth0/nextjs-auth0 handles sessions and route protection
• Route guards: Manual withApiAuthRequired and withPageAuthRequired wrappers
• Server Components: getSession() calls with proper cookie handling
• No pre-built React components: you build forms against Auth0 APIs

Integration time: 2-4 hours basic, 1-2 days with custom UI.

Supabase Auth with Next.js

The @supabase/ssr package handles server-side auth:

• Middleware: Cookie-based session management for SSR
• Server Components: createServerClient() provides auth context
• RLS integration: Auth tokens applied automatically to database queries
• No pre-built components: build your own forms with the Supabase JS client

Want a hands-on walkthrough? Our Supabase Auth with Next.js tutorial covers the full implementation, from project configuration to protected routes.

Integration time: 1-2 hours basic, longer with custom UI.

Firebase Auth with Next.js

The most manual of the hosted options:

• No official middleware: you implement route protection yourself
• Token refresh: manual 1-hour expiry handling
• Server Components: custom setup with the Admin SDK
• FirebaseUI: basic components, not built for modern React patterns

Integration time: 4-8 hours for something production-ready.

Better Auth with Next.js

Framework-agnostic, but the Next.js path is well trodden:

• Route handler: one catch-all API route mounts the whole auth surface
• Server Components: auth.api.getSession() reads the session server-side
• Middleware: you write it, using the session helper
• Database: your own Postgres, MySQL, or SQLite via the adapter of your choice
• No pre-built components: every screen is yours to build

Integration time: 2-4 hours for the backend, plus however long your UI takes.

Picking an ORM for your Next.js project? Your auth choice shapes how you structure data access.

Clerk and Auth0 work with any ORM. Supabase Auth fits most naturally with Supabase's client and RLS. And Better Auth has adapters for both Prisma and Drizzle.

The Decision Framework

Choose Clerk If:

• You're building a Next.js SaaS and want the fastest integration
• Pre-built UI components would save you real development time
• You need organizations, RBAC, and team management out of the box
• You're under 50,000 MRUs, where it's free
• Developer experience is a top priority for your team
• You need a HIPAA BAA and Clerk otherwise fits — talk to their Enterprise team
• You're using SaaS starter kits that bundle Clerk

Choose Auth0 If:

• You sell to enterprise customers who require SAML SSO
• HIPAA or custom BAA agreements are mandatory
• You need adaptive MFA with risk-based policies
• Custom pipeline logic through Actions matters to you
• You're under 25,000 MAUs, where it's now free
• SSO is a sales requirement rather than a nice-to-have

Choose Supabase Auth If:

• You already use Supabase for your database and want one stack
• Cost at scale is critical — $25 to 100,000 MAUs is unmatched here
• Row Level Security at the database level fits your security model
• You prefer open source with a self-hosting escape hatch
• You're comfortable building your own auth UI
• You don't need a HIPAA BAA

Choose Firebase Auth If:

• You're already on Google Cloud with Firestore and Cloud Functions
• Phone authentication across 200+ countries is a core requirement
• You're building mobile-first, where Firebase's SDKs are strongest
• Lock-in to Google Cloud is acceptable for your architecture

Choose Better Auth If:

• You want zero vendor lock-in and no per-user pricing, ever
• Your team can own compliance, uptime, and security patching
• You're not all-in on React and want framework flexibility
• You're at a scale where per-user billing would genuinely hurt
• You're starting from a boilerplate that already ships it

Conclusion

The best auth provider comparison in 2026 comes down to what your SaaS needs most: developer experience, enterprise features, cost efficiency, ecosystem fit, or independence.

Clerk is still right for most new Next.js SaaS. Pre-built components, native middleware, and organization management put you weeks ahead. And it's free to 50,000 MRUs now, which removes the main objection this guide used to raise against it.

Auth0 is right when enterprise sales require SAML SSO and compliance documentation. It costs more, but the auth provider an enterprise buyer requires isn't the one an indie founder needs. Its 25,000 free MAUs also make it far more approachable than it was.

Supabase Auth is right when you want the cheapest auth at scale bundled with a full backend. $25/mo to 100,000 MAUs is the best value on this page by a distance. You trade UI work and a HIPAA path for it.

Firebase Auth is right when you're already committed to Google Cloud. The modern React DX is weaker than every alternative here, and that gap grew this year.

Better Auth is right when you'd rather own your auth layer than rent it. It's now the most-installed option in this comparison, and the boilerplate market has already adopted it as a default.

Three things changed since the last update, and they're worth calling out plainly.

Clerk's free tier went from 10,000 to 50,000. Auth0's went from 7,000 to 25,000. And Clerk added a HIPAA BAA we previously told you didn't exist.

So if you ruled out Clerk on free-tier headroom, or Auth0 on the old 7,000 ceiling, or Clerk on HIPAA, you decided on numbers that no longer hold.

Worth revisiting.

Pick the provider that matches your current stage and your next 12 months of growth. Authentication is hard to change later, so choose with your next revenue milestone in mind, not just today's user count.

That's a wrap on our 2026 comparison.

---

Related Resources

• Stripe vs Paddle for SaaS: Payments Compared
• Stripe vs Lemon Squeezy: Which for Your SaaS?
• Vercel vs Railway: Best Deployment for SaaS
• Prisma vs Drizzle: Which ORM for Your Next.js Project?
• Best SaaS Starter Kits in 2026
• Best Next.js SaaS Templates: 12 Ranked
• Best AI for Coding: 15 Tools Compared
• Firebase vs Supabase: Complete Developer Comparison