Auth0 is the name most developers reach for when they don't want to build their own login system — password resets, "sign in with Google", session management, all handled for you. But it's not the only option, and depending on what you actually need, it isn't always the right one. Clerk and Supabase Auth cover the general drop-in-auth space too, but here are three alternatives from our catalog that each solve a more specific version of the problem: a cheaper general-purpose auth service, a specialist for selling enterprise SSO to big customers, and a tool that fixes login instead of replacing it.
1. MonoCloud — the cheaper drop-in alternative
MonoCloud handles login screens, password resets and social sign-in the same way Auth0 does — a drop-in service so you don't build your own auth system from scratch — but with a noticeably larger free tier and lower entry pricing.
Good for: developers who want passkeys and SSO/OIDC included out of the box, plus a free tier that covers up to 50,000 monthly active users before you pay anything.
Limits: it's far less known than Auth0 or Clerk, with a smaller community and less mature documentation, and the advanced security add-ons (ScaleX, Secure+, mTLSConnect) get expensive on top of the base price.
Price: Free up to 50K MAU; Pro $24.99/month; add-ons $99.99–$199.99/month; $0.015 per additional MAU.
2. SSOJet — built specifically for selling enterprise SSO
SSOJet solves a narrower problem than general auth: big enterprise customers who won't sign a contract unless your app supports SSO through their own Okta or Azure AD. Building that integration yourself, for every possible identity provider, can take months — SSOJet plugs in over 100 ready-made connectors instead.
Good for: B2B SaaS companies that already have their own auth system but need to bolt on enterprise SSO to close deals, without touching what's already working. It's SOC 2 Type II certified, GDPR/HIPAA compliant, and includes a self-service portal so the customer configures their own identity provider.
Limits: pricing is per SSO connection rather than per user, so the $99/month minimum can feel steep for a startup with only one or two enterprise customers, and it climbs further as you add more identity providers.
Price: 30-day free trial with full access; Business from $99/month for 2 SSO connections; Enterprise on request for private cloud and unlimited connections.
3. Corbado — fixes login friction instead of replacing your auth
Corbado is a different kind of alternative: instead of replacing Auth0 (or Okta, or whatever you already use), it sits on top and shows exactly where people give up trying to log in — which method, which device, which step — plus an optional managed-passkey product. It integrates with 25+ identity providers, including Auth0 itself.
Good for: companies with meaningful login volume who want to reduce signup drop-off without a risky migration off their existing identity provider — it processes over 1.6 billion authentication signals in production already.
Limits: pricing is completely opaque with no public numbers and no announced free trial, and it only makes sense once your login volume is large enough to justify a sales conversation.
Price: Not published; sales contact required for both Corbado Observe (analytics layer) and Corbado Connect (managed passkeys).
How they compare
| Tool | Best for | Starting price | Scope |
|---|---|---|---|
| MonoCloud | Cheaper general drop-in auth | Free up to 50K MAU | Full auth replacement |
| SSOJet | Selling enterprise SSO fast | $99/mo (2 connections) | SSO add-on, not a replacement |
| Corbado | Fixing login drop-off + passkeys | Quote-only | Analytics layer on existing IAM |
If you're choosing Auth0 for the first time and budget matters, MonoCloud covers the same ground for less, with a free tier that goes much further before you pay. If you already have working auth and the only reason you're looking is a big customer demanding enterprise SSO, SSOJet solves exactly that without touching anything else. And if your real problem isn't the auth provider at all but people abandoning your login flow, Corbado is the only one of the three that doesn't ask you to migrate off Auth0 to fix it.