Auth0, Clerk, Stytch & WorkOS alternatives — honest comparison
Looking for an alternative to Auth0, Clerk, Stytch, or WorkOS? Most devs end up shopping for one of two reasons: per-seat pricing got out of hand, or a feature they need is gated behind the wrong tier. Here's how AuthStack stacks up against the major incumbents on the things that actually matter.
| AuthStack | Auth0 | Clerk | Stytch | WorkOS | |
|---|---|---|---|---|---|
| Pricing model | Usage / MAU | Tiered + per-MAU | Per-MAU bands | Per-MAU + add-ons | Per-connection |
| Free tier (MAU) | 1,000 | 7,500 | 10,000 | 1,000 | 1,000,000 |
| Pay per OAuth app | No | 1 free, then $$ | Yes | Yes | Yes |
| WebAuthn / passkeys | Free tier | B2C tier+ | Pro+ | Pro+ | Enterprise add-on |
| TOTP MFA | Free tier | Essentials+ | Pro+ | Pro+ | Included |
| First-class Flutter SDK | Yes | Community | No | No | No |
| First-class .NET SDK | Yes | Yes | Community | Community | Yes |
| Hosted auth pages | Yes, per-app branded | Yes | Yes | Yes (B2B) | Yes |
| Per-org SMTP + templates | Free tier | Add-on | Pro+ | Pro+ | Included |
| Webhooks & audit events | Yes | Yes | Yes | Yes | Yes |
| Source-available SDKs | MIT | MIT | MIT | MIT | MIT |
Comparison data is collected from public pricing pages and changelogs as of 2026. Tiers change; double-check before you commit.
When to pick what
Pick AuthStack if…
You're a small-to-mid team that wants modern auth (passkeys, MFA, per-app branding) at usage-based pricing, with first-class Flutter + .NET SDKs and no per-seat tax.
Pick Auth0 if…
You need a long roster of compliance certifications (SOC 2 Type II for years, HIPAA BAA, FedRAMP) and your buyer cares about the brand on the procurement sheet.
Pick Clerk if…
You're React/Next.js-first and want the dev-experience polish — drop-in components, Clerk-branded UI, account portal — and per-MAU pricing fits your shape.
Pick Stytch if…
Passwordless-first or B2B SaaS with SSO + SCIM as a top requirement. Stytch leans hard into magic links and enterprise federation.
Pick WorkOS if…
You're selling into enterprises and need SAML, SCIM, and Directory Sync as a wedge into procurement. WorkOS is the "enterprise-ready in a week" choice.
Pick Firebase/Supabase Auth if…
You're already deep in Firebase or Supabase and the lock-in to that backend is acceptable. Lower-cost but tied to a wider platform.
Migrating from Auth0 / Clerk / Stytch?
Bring your own users. AuthStack's API accepts bulk imports of users with hashed passwords (bcrypt, argon2, scrypt). The end-user account surface looks the same to your users post-migration, just under your own brand instead of the previous provider's.