Auth0 remains the corporate standard for enterprise SAML/SSO ($150+/mo add-on), while Clerk leads developer UX for Next.js/React ($25/mo base + $0.02/MAU above 10k). For self-hosted or cost-conscious stacks, Supabase Auth is unmatched, offering 50,000 free MAUs and $0.00325/MAU thereafter, saving 80% on consumer-scale apps.
Compare MAU scaling costs, SMS 2FA surcharges, and enterprise SAML SSO walls across Clerk, Supabase Auth, Auth0, and WorkOS.
10k free. Pro base $25 + $0.02/MAU ($20/1k). Drop-in Next.js/React components with user management.
Pro plan $25 includes 100k MAUs! Overages only $0.00325/MAU ($3.25/1k). Native integration with database Row-Level Security.
7.5k free. Professional plan $240/mo for 10k MAU. Enterprise SAML SSO gated behind custom contracts ($15k+/yr).
Free basic auth up to 1M MAU! Charges $99/mo only when an enterprise customer demands custom SAML SSO / SCIM.
| Provider | Free Tier MAU | Cost at 50k MAU | Cost at 150k MAU | SAML SSO Pricing | Best For |
|---|---|---|---|---|---|
| Supabase Auth | 50,000 MAU | $25.00 | $187.50 | Included in Pro (via BoxyHQ) | Lowest cost at scale & Postgres apps |
| Clerk | 10,000 MAU | $825.00 | $2,825.00 | $100+/mo addon | Fastest developer velocity & Next.js DX |
| Auth0 | 7,500 MAU | $720.00 | Enterprise Quote | $15,000+/year gate | Legacy enterprise IT architectures |
| WorkOS | 1,000,000 MAU | $0.00 | $0.00 | $99/connection/mo | B2B SaaS with enterprise Okta/Azure SSO |
Selecting an authentication and identity provider requires balancing developer velocity against aggressive Monthly Active User (MAU) step pricing and enterprise SAML SSO surcharges. Providers like Auth0 (Okta) offer polished features but scale steeply, charging $0.07 to $0.15 per MAU plus $100 to $1,500/month for Enterprise Connection add-ons. Modern alternatives like Clerk ($0.02/MAU above 10k), Supabase Auth (included in base tier up to 100k MAU), Stytch, and WorkOS allow startups to ship OAuth, Passkeys, and multi-tenant organization hierarchies without exponential billing increases.
| Monthly Active Users (MAU) | Clerk | Auth0 (B2B Professional) | Supabase Auth (Pro) | WorkOS (AuthKit) |
|---|---|---|---|---|
| 5,000 MAU (Free Tier) | $0.00 | $35.00 | $0.00 | $0.00 |
| 25,000 MAU (+ B2B Orgs) | $325.00 | $850.00 | $25.00 | $250.00 |
| 100,000 MAU (+ Enterprise SSO) | $1,825.00 | $4,200.00+ | $125.00 ($0.00325 overage) | $1,100.00 |
import { createRemoteJWKSet, jwtVerify } from 'jose';
// Cache JSON Web Key Set (JWKS) locally to avoid hitting provider API on every request
const JWKS = createRemoteJWKSet(new URL('https://api.clerk.com/v1/.well-known/jwks.json'), {
cacheMaxAge: 3600000, // 1 hour memory cache
cooldownDuration: 30000
});
export async function verifySessionToken(token: string) {
try {
const { payload } = await jwtVerify(token, JWKS, {
issuer: 'https://clerk.yourdomain.com'
});
return { valid: true, userId: payload.sub, orgId: payload.org_id };
} catch (err) {
return { valid: false, error: 'TOKEN_EXPIRED_OR_INVALID' };
}
}Clerk is a dedicated frontend-and-backend authentication SaaS featuring pre-built React components, user profile widgets, and out-of-the-box organization switching. Supabase Auth is an open-source GoTrue identity engine directly integrated into Postgres Row-Level Security (RLS) tables, making it drastically cheaper at high volumes.
Passkeys use asymmetric cryptography built into device hardware (Touch ID, Face ID, Windows Hello). Because they do not send SMS OTP codes, migrating users from phone verification to Passkeys eliminates Twilio SMS charges ($0.0079 to $0.05 per verification), saving thousands of dollars annually.
Handling session invalidation in globally distributed edge architectures (Cloudflare Workers, AWS CloudFront Lambda@Edge) requires solving the stateless JWT latency paradox. While stateless JWTs eliminate database roundtrips, revoking a compromised token traditionally required querying a central database. Modern developer auth engines solve this by deploying an ultra-fast Redis or Cloudflare KV revocation bloom filter. When an admin revokes a session or user password, the user ID is broadcasted to edge caches via pub/sub within 50ms, allowing edge nodes to reject tainted tokens immediately with zero database query cost.