Top Auth0 Alternatives in 2026

Clerk is the closest thing to Auth0 for teams that want working login on day one instead of building screens from scratch. It ships prebuilt sign-in, sign-up, and account management components that drop into a Next.js or React app with almost no custom UI work, a level of polish Auth0's Universal Login doesn't try to match. The free Hobby plan covers 50,000 monthly retained users (MRU), meaning users who actually come back a day later, which is more room than most teams need in their first year. The Pro plan includes one enterprise SSO connection, so a first B2B customer doesn't require an upgrade. The catch is that broader B2B org support, admin impersonation, and billing are each separate paid add-ons on top of that, most notably $100/month for B2B authentication covering 100 monthly retained organizations, and MRU-based costs climb once an app has real traffic.

WorkOS answers the exact complaint most teams have about Auth0: enterprise SSO gets expensive fast. Core login and user management through AuthKit is free up to 1 million monthly active users, a ceiling most apps won't hit for years, compared with Auth0's own free tier, which tops out at 25,000 MAU. When you do need enterprise SSO or SCIM directory sync, WorkOS charges per identity provider connection, $125/month at low volume, dropping to $65/month past 50 connections, instead of pushing you onto a separate, pricier B2B tier the way Auth0's B2B Essentials and Professional plans do. AuthKit gives you a hosted, customizable login page and supports 20+ identity providers out of the box. The tradeoff is a pricing sheet split across MAUs, connections, audit log retention, and fraud checks, so there's no single number to budget against.

Stytch fits teams that want to own their login screens and call an API instead of dropping in someone else's components. It covers passwords, magic links, passkeys, OAuth, SAML/OIDC SSO, and machine-to-machine auth, with a free tier covering 10,000 monthly active users that includes SSO, RBAC, and sessions rather than a stripped-down trial. Its B2B product adds organizations and an embeddable admin portal so enterprise customers can manage their own SSO and SCIM setup, similar to what Auth0 offers on its B2B track but without splitting pricing into separate consumer and business plans. The real overage rate past the free tier isn't published, so budgeting at scale still means a sales call. Twilio's October 2025 acquisition adds some uncertainty about long-term roadmap independence.

SuperTokens is the pick for teams that want to get off per-MAU billing entirely. The core login system, email/password, passwordless, social login, SSO, and multi-tenancy, is open source and free to self-host with no user cap, or you can run SuperTokens' managed cloud free up to 5,000 MAU. That's a direct answer to Auth0's model of charging for every monthly active user regardless of hosting. The Node.js SDK is solid and well liked, though the React SDK and the recipe-based docs get called harder to navigate than competitors' on Hacker News. MFA and account linking are billed per MAU with a $100/month minimum once turned on, while extra dashboard seats are a flat $20/user/month with the first 3 free, so basic auth is genuinely free but the extras aren't.

Frontegg is built for B2B SaaS teams that want organizations, hierarchies, and fine-grained entitlements bundled with login instead of layered on as separate products. The free Pay as you go plan covers 7,500 monthly active users and 5 SSO/SCIM connections, enough to run an early enterprise motion without paying anything. It also covers machine-to-machine auth and, more recently, identity tooling for AI agents through AgentLink and FrontMCP. The gap compared with WorkOS or Auth0 is pricing transparency: Frontegg doesn't publish what usage past the free tier costs, so estimating your bill at scale means talking to sales. With only two named plans, free and custom Enterprise, there's no visible middle tier to compare against.

Firebase isn't a dedicated CIAM product like the rest of this list, it's Google's full backend platform, but Firebase Authentication is the answer a lot of cost-sensitive teams land on when they just want login to be nearly free. The free Spark plan covers 50,000 monthly active users with email/password, phone, and social sign-in, and there's no self-service enterprise SSO or SCIM tier to buy into at all, unlike Auth0. That's the tradeoff: you get auth bundled with a real-time database, storage, and hosting in one console, but organizations, fine-grained roles, and enterprise SSO require Google's separate Identity Platform product with its own usage-based pricing rather than a simple upgrade. It's a fit for teams already building on Google Cloud, not a like-for-like Auth0 replacement for B2B SaaS.