Auth used to be "pick Auth0 or write it yourself." In 2026 the market is crowded with serious options — and the differences finally matter. Pricing models diverged (per-MAU vs. per-org vs. per-feature), B2B SSO became table stakes for any product selling to mid-market, and passkeys are now the default sign-in method on most consumer apps. This guide walks the six platforms developers actually pick between and tells you when each one wins.
Quick Picks
- Best for B2C apps with a Next.js or React frontend→Clerk. Best DX, prebuilt UI, and per-organization pricing means MAU spikes don't blow up the bill.
- Best for selling to enterprise (SSO, SCIM, audit logs out of the box)→WorkOS. Free up to 1M MAU on user management, charges only when you flip on SSO/SCIM.
- Best for a unified backend (auth + database + storage)→Supabase. Open source, generous free tier, and row-level security ties auth directly to your data model.
- Best for legacy enterprise migrations and multi-tenant complexity→Auth0. Mature, deep extensibility, but priced for enterprise budgets.
- Best for mobile-first apps already in the Google stack→FirebaseAuth (Identity Platform). Cheap, simple, scales globally without ops.
- Best for passwordless-first and AI agent identity→ Stytch. Modern API, strong magic links/OTP/biometrics, and the new Connected Apps product for agent-to-SaaS authorization.
How Auth-as-a-Service Pricing Actually Works in 2026
Three pricing models dominate. Understanding which one you're agreeing to is more important than the sticker price.
- Per-MAU (Monthly Active User):Auth0, Firebase Identity Platform, Stytch. You pay every month for every user who signs in. Predictable for steady-state SaaS, painful for high-traffic consumer apps with viral spikes.
- Per-organization or per-seat:Clerk, WorkOS. Pricing scales with paying customers (B2B) rather than end-users. Aligns the auth bill with your revenue.
- Bundled with platform:Supabase, Firebase. Auth is included with the database/backend tier; you pay for compute and storage rather than user counts. Excellent value if you're using the rest of the platform.
2026 Pricing Snapshot
| Platform | Free Tier | Paid Entry Point | SSO / SCIM Add-on |
|---|---|---|---|
| Auth0 | 7,500 MAU (B2C Free) | $240/mo (Essentials, 500 MAU) | Enterprise — quoted |
| Clerk | 10,000 MAU + 100 orgs | $25/mo (Pro) | $100/mo per SSO connection |
| Supabase Auth | 50,000 MAU (Free tier) | $25/mo (Pro project) | $599/mo Team plan |
| Firebase Auth | 50,000 MAU (Identity Platform) | $0.0055/MAU above | $0.015/MAU SAML/OIDC |
| WorkOS | 1M MAU (User Management) | Free for User Mgmt | $125/mo per SSO connection |
| Stytch | 10,000 MAU + 1,000 orgs | $249/mo (Standard) | $99/mo per SSO connection |
Prices reflect public list pricing as of May 2026. Enterprise volume discounts are typical above 50K MAU on every platform.
Auth0 — The Enterprise Default, Now With a Cheaper Bottom Step
Auth0 is the original auth-as-a-service and still powers a huge fraction of mid-market and enterprise SaaS. Now part of Okta, it's the safest "nobody got fired for picking it" choice.
What's strong:the rule engine (Actions/Hooks) is unmatched for complex login logic — risk scoring, step-up auth, custom MFA flows, and integrations with hundreds of identity providers. Tenant isolation is rock-solid for true multi-tenant SaaS, and the admin dashboard is the most polished in the category. Compliance posture (SOC 2, HIPAA, FedRAMP Moderate, PCI) is the deepest in the market.
What's weak:pricing. The B2B SaaS tier starts at $1,500/month with SSO, and the per-MAU costs for B2C scale aggressively. Documentation has improved but is still sprawling — finding the canonical way to do something can take longer than it should. Migration off Auth0 is harder than off any other platform on this list because of how deeply Actions get tangled into your login flow.
Pick Auth0 if:you sell to enterprise IT, you need very specific compliance certifications, or you're inheriting an Auth0 deployment and stability matters more than savings.
Clerk — The Frontend-Native Choice
Clerk is the platform developers reach for when they want auth to feel like a UI library, not a backend service. The prebuilt React/Next.js components (<SignIn />,<UserButton />,<OrganizationSwitcher />) are the best in the industry, and the developer experience consistently shows up at the top of community surveys.
What's strong:the React/Next.js/Remix integration is genuinely 5 minutes to a working login flow. Organizations and roles are first-class — you don't bolt on B2B as an afterthought. Pricing scales with monthly active organizations rather than just users, which means a single B2B customer with 10,000 employees doesn't become a runaway cost. Built-in support for passkeys, magic links, OAuth, MFA, and bot detection.
What's weak:the prebuilt UI is hard to deeply customize without re-implementing it (Clerk Elements helps but adds complexity). Mobile and non-React frameworks are second-class citizens. Self-hosting isn't an option, and a Clerk outage takes your login flow with it.
Pick Clerk if:you're building a Next.js or React app, you sell B2B with org/team primitives, and you'd rather pay for great DX than spend a sprint on auth UI.
Supabase Auth — Auth Bundled With Your Backend
Supabase positions itself as "the open-source Firebase," and its auth product is one of the cleanest implementations in the open-source world. Built on top of Postgres and the GoTrue server, it integrates auth directly with row-level security in your database.
What's strong:RLS-driven authorization. You write SQL policies that referenceauth.uid()and the database itself enforces who can read what — no middleware layer to forget. The free tier (50K MAU) is the most generous on this list. You can self-host the entire stack with a docker compose, which keeps regulated industries happy.
What's weak:if you're not already using Supabase for the database, the auth product alone is a harder sell — the value comes from the bundle. Enterprise SSO, SCIM provisioning, and granular admin controls lag behind WorkOS/Auth0/Clerk. The dashboard is improving but still less polished. RLS is powerful but has a learning curve, and getting it wrong is a security incident.
Pick Supabase if:Postgres is your database of choice, you want a single platform for auth/data/storage, and you value open-source portability. Pair it withPostHogfor analytics and you have a solid full-stack foundation for a small team.
Firebase Auth (Identity Platform) — Cheap, Global, Hands-Off
Firebase Auth — now branded as Identity Platform under Google Cloud — has been quietly powering massive consumer apps for a decade. It's the default for anyone shipping a mobile app fast.
What's strong:global availability and edge-cached identity reads make latency a non-issue. Mobile SDKs are best-in-class, especially for iOS and Android, with fast support for Sign in with Apple, Google, phone OTP, and email link. Pricing scales linearly per MAU with no big jumps. Deep integration with Firestore, Cloud Functions, and Cloud Run lets you stay in one ecosystem.
What's weak:the admin console feels stuck in 2018. B2B features like organizations, SSO, and SCIM are available but require flipping to the more expensive Identity Platform tier and configuring them yourself — there's no premium B2B SKU. The migration path off Firebase is painful because user IDs and password hashes use Google-specific formats. Customization of the prebuilt FirebaseUI is limited.
Pick Firebase if:you're building a consumer mobile app, want minimal ops, and the rest of your backend lives in Google Cloud anyway.
WorkOS — The B2B SaaS Special
WorkOS isn't a general-purpose auth platform — it's auth designed for the moment your SaaS starts selling to enterprise. The pitch: keep your existing auth for self-serve users, drop in WorkOS for the customers asking about SAML and SCIM.
What's strong:SSO is dead simple. One API call gets you a redirect URL; the customer's IT admin sets up the connection in WorkOS Admin Portal. SCIM directory sync handles auto-provisioning and deprovisioning. The acquisition of Stack Auth in late 2025 means WorkOS now also ships a full-featured user-management product (free up to 1M MAU). The pricing model is unique: no per-MAU charge for user management, only $125/mo per active enterprise SSO connection — so cost tracks with closed enterprise deals, not your overall user count.
What's weak:if you don't sell to enterprise, the value collapses — you're paying for a feature you don't use. The hosted UI is functional but less polished than Clerk's. The brand is dev-focused; non-technical stakeholders may not have heard of WorkOS the way they have Auth0.
Pick WorkOS if:your sales team is fielding "do you support SSO?" requests and you want to say yes by next quarter without rebuilding auth.
Stytch — Passwordless-First and Built for AI Agents
Stytch is the youngest of the bunch but has carved out a niche around passwordless authentication and, in 2026, agent identity. Companies like Replit, Clay, and a handful of AI-native startups run their auth on Stytch.
What's strong:passkeys, magic links, OTP, and biometrics work well across web and mobile, with sensible defaults that match what users actually expect now. The new Connected Apps product solves a real problem: how does an AI agent authenticate to your SaaS app on behalf of a user? Stytch implements OAuth 2.0 and OIDC server-side so you can become an OAuth provider without building it yourself. B2B SaaS Authentication product (separate SKU) is a credible Auth0 competitor with cleaner pricing.
What's weak:smaller community than Auth0 or Clerk — fewer Stack Overflow answers, fewer template repos. The dashboard is solid but not as fast as Clerk's. Pricing tiers are dense; figuring out exactly which features are in B2B Pro vs. Stytch Custom takes a sales call.
Pick Stytch if:you want passwordless as the primary login flow, you're shipping an AI agent or letting agents act on your platform, or you want a more modern alternative to Auth0 without committing to Clerk's React-heavy approach.
Side-by-Side: Feature Matrix
| Feature | Auth0 | Clerk | Supabase | Firebase | WorkOS | Stytch |
|---|---|---|---|---|---|---|
| Passkeys | Yes | Yes | Beta | Yes | Yes | Yes (native) |
| Built-in Organizations | Yes | Yes (best UX) | Custom (RLS) | No | Yes | Yes |
| SAML SSO | Yes | Yes (paid) | Yes (Team) | Yes (Identity Platform) | Yes (specialty) | Yes (paid) |
| SCIM Directory Sync | Yes | Yes (paid) | No | Limited | Yes (specialty) | Yes |
| Self-Hosting | Private Cloud (enterprise) | No | Yes (OSS) | No | Stack Auth OSS | No |
| Best DX (subjective) | Decent | Best in class | Strong (Next.js) | Strong (mobile) | Solid | Modern |
The Cost Trap Nobody Warns You About
Auth pricing tiers look reasonable on the marketing page and become a problem six months later. Three patterns to watch for:
- The MAU explosion.Per-MAU pricing means a viral consumer launch turns into a five-figure auth bill. Auth0 and Stytch's per-MAU lines are the most exposed; Firebase's is cheap enough to absorb. Always model the worst-case month, not the steady state.
- The SSO upcharge.Most platforms list "SSO" as a feature but charge per-connection ($100-$300/mo). One enterprise customer = one connection. Five = five times the bill. Negotiate flat-rate enterprise tiers if you're closing more than three SSO deals a year.
- Hidden tier flips.Auth0 jumps from $240 to $1,500+ when you cross from B2C to B2B SaaS, even if you only need org features. Firebase silently moves you to Identity Platform pricing if you turn on certain features. Ask sales for a one-page rate card before signing — and re-read it before you launch.
If you want to internalize the discipline of catching these spikes early, run the framework in our60-minute SaaS stack auditagainst your auth provider every quarter.
Migration Difficulty Ranking
Eventually most teams move auth providers. Plan for it — the difficulty is not symmetric.
- Easiest:Supabase ↔ self-hosted GoTrue. Same underlying tech.
- Moderate:Clerk → WorkOS → Stytch. All export users with hashed passwords (bcrypt) and standard OAuth identifiers. Plan a 2-3 week transition with a dual-write window.
- Hard:Auth0 → anything. Rules and Actions don't have one-to-one analogs elsewhere; you'll rewrite them. Auth0 password hashes (bcrypt) are exportable but the multi-factor enrollments don't all export cleanly.
- Hardest:Firebase → anything. Firebase uses scrypt with a Google-specific parameter set. Users can keep logging in via a one-time "upgrade" hash on first login, but the migration script is non-trivial. Many teams just force a password reset and call it acceptable.
What About B2B vs. B2C?
The platform you pick depends more on customer model than on tech stack.
- Pure B2C (consumer apps, mobile-first):Firebase Auth or Supabase. Both are cheap at scale and don't waste your money on enterprise features you'll never use.
- B2C with paid tiers (Stripe Connect-style products):Clerk or Stytch. Both handle the auth + billing-association layer well.
- B2B SaaS pre-Series A:Clerk or Supabase. Cheap enough to grow into, with org features when you need them.
- B2B SaaS selling to enterprise:WorkOS for the SSO/SCIM layer (in front of your existing auth) or Auth0 if you want everything in one tool.
- AI-native products (agents, MCP servers, OAuth-as-a-platform):Stytch's Connected Apps or roll your own on top of Clerk Backend SDK. This category is the newest and most fluid.
FAQ
Should I just roll my own auth in 2026?
Probably not. Passkeys, MFA, anomaly detection, OAuth provider integrations, and CSRF/session security are non-trivial to get right. The maintenance load alone justifies $25/mo. The exception: if you have specific regulatory requirements (Chinese market, government, FedRAMP High) that none of the SaaS providers meet, self-hosted Keycloak or Ory becomes credible.
Is open source worth the trade-off?
Open source matters when you're worried about vendor lock-in, want to self-host for compliance, or genuinely benefit from forking the codebase. For 95% of teams, hosted SaaS auth is the right answer. The open-source story is strongest with Supabase Auth (the underlying GoTrue is OSS), and now WorkOS via Stack Auth.
Which platform handles AI agents authenticating on behalf of users?
Stytch's Connected Apps is the most polished at this in 2026 — it lets you become an OAuth 2.0 + OIDC provider so AI agents can request scoped access. Clerk has a comparable feature in beta. Auth0 supports the same via custom Actions but requires meaningful implementation. Expect this category to expand fast as MCP-style agent flows become more common.
How do feature flags fit in?
Auth platforms decide who you are;feature flag toolsdecide what you see. Most teams pair an auth provider with a flagging tool to gate beta features by user/org. Some auth platforms (Clerk, Stytch) include lightweight per-user attribute targeting, but it's not a full A/B testing engine.
Do passkeys really replace passwords now?
For consumer apps with iOS/Android device penetration, yes — Apple, Google, Microsoft, and most password managers all support passkey sync as of late 2025. For B2B with Windows fleets and shared workstations, passwords + MFA still dominate. Plan for passkeys-first but keep password fallback for at least another 24 months.
Can I switch auth providers without forcing users to reset passwords?
Sometimes. If both providers use bcrypt with compatible parameters and you have export access to the hashes, you can migrate transparently. If your source provider uses scrypt (Firebase) or proprietary hashing (some Auth0 deployments), you'll typically run a transition period where the new provider lazily re-hashes the password on first login. Force-reset is the fallback if exports aren't possible.
Bottom Line
If you're starting a B2B SaaS in Next.js today and you don't know what to pick:Clerk. The DX wins back the time you'd spend evaluating, and the per-org pricing keeps the bill predictable.
If you're starting a consumer mobile app:Firebase. It's cheap, scales globally, and doesn't punish viral spikes.
If your database is already Postgres and you want a single bundled platform:Supabase. The RLS-driven authorization model is genuinely better than middleware-based approaches.
If you're explicitly chasing enterprise contracts: addWorkOSalongside whatever you already have, rather than rebuilding everything in Auth0.
And if you're inheriting Auth0, keep it. Migration is rarely worth the cost — invest the same effort in cleaning up your Actions and pushing back on Okta's renewal terms.
