Firebase Authentication alternatives.
Firebase Authentication is excellent for B2C, but its ceiling is real: no genuine B2B Organizations or Enterprise SSO, tight coupling to GCP, and the Identity Platform upgrade adds complexity rather than removing the limits. This page ranks alternatives by the ceiling each one lifts, from the same capability matrix, with no vendor money.
Ranked on: fixing Firebase's ceiling
Read the Firebase Authentication profile for the full verdict these pains are drawn from.
Why teams leave Firebase Authentication
- B2C only. Firebase Auth has no real B2B Organizations or multi-tenant model, so the moment you sell to businesses that need their own tenant boundaries, you are building it yourself.
- No Enterprise SSO. There is no first-class SAML or enterprise federation story, which blocks the first enterprise customer that requires SSO.
- GCP coupling. Firebase Auth is wired into the Google Cloud ecosystem; moving the rest of your stack off GCP means auth is an anchor holding you there.
- The Identity Platform upgrade. The paid Identity Platform tier adds MFA and multi-tenancy but also adds pricing and configuration complexity, and still does not match a dedicated B2B CIAM on Organizations depth.
The alternatives, ranked
Supabase Auth
Postgres-native, OSS, same bundled modelYou want auth bundled with your backend, but not on GCP.
Supabase Auth wins when you like the Firebase model but want Postgres and open source.
Supabase Auth keeps the thing teams like about Firebase, auth bundled with the backend, but on a Postgres foundation with row-level security and an open-source core you can self-host. The capability matrix favors Supabase on portability and data ownership. It is still B2C-leaning, so it lifts the GCP-coupling ceiling, not the B2B-Organizations one.
- Best for
- Teams that want the Firebase developer model on Postgres with an exit option.
- Watch out for
- Like Firebase, it is B2C-first; it does not by itself solve the Enterprise SSO gap.
Read the Supabase Auth profileSee Firebase Authentication vs Supabase Auth
Auth0
B2B Organizations and Enterprise SSOYou now need B2B Organizations and Enterprise SSO.
Auth0 wins when an enterprise customer demands SSO and Firebase cannot deliver it.
Auth0 carries a deep B2B Organizations model, SAML and OIDC enterprise connections, and a large federation catalog, which is exactly the surface Firebase lacks. On the shared matrix the breadth gap versus Firebase is large. The trade is cost: Auth0 prices on tiered MAU and gets expensive at scale, so size the bill before committing.
- Best for
- Teams crossing from consumer into enterprise B2B that need SSO and tenant isolation.
- Watch out for
- Auth0 pricing climbs steeply past 100k MAU; this fixes the feature ceiling, not the cost one.
Clerk
modern DX, B2C plus light B2B, off GCPFirebase's DX feels dated and you want off GCP.
Clerk wins when you want a modern component-driven DX with light B2B, independent of Google Cloud.
Clerk offers prebuilt auth UI, organizations for light B2B multi-tenancy, and a developer experience tuned for React and Next.js, with no GCP dependency. It lifts both the DX and the coupling ceilings while adding basic B2B that Firebase lacks. Per-MAU pricing means you should re-check the math as consumer volume grows.
- Best for
- React and Next.js teams that want polished auth plus light organizations, off GCP.
- Watch out for
- Organizations are lighter than a dedicated B2B CIAM; heavy enterprise needs outgrow it.
Amazon Cognito
the other hyperscaler-native optionYou want hyperscaler-native auth but live on AWS, not GCP.
Cognito wins when your stack is AWS and you want identity inside the same cloud bill and IAM.
Cognito is the AWS-native counterpart to Firebase: user pools, OIDC, and tight integration with the rest of AWS. On the matrix it carries more enterprise-oriented capability than Firebase Auth. The cost is a developer experience that is rougher than the modern entrants, which is the well-known Cognito trade.
- Best for
- AWS-centric teams that want identity in the same cloud account and IAM model.
- Watch out for
- Cognito's developer experience and customization lag the modern platforms.
Read the Amazon Cognito profileSee Amazon Cognito vs Firebase Authentication
Microsoft Entra External ID
Microsoft-shop consumer appsYour organization is Microsoft-centric and Firebase fights that.
Entra External ID wins when you are a Microsoft shop and want consumer identity in the same tenant.
Microsoft Entra External ID (formerly Azure AD B2C) brings consumer identity into the Microsoft cloud, with Entra administration, conditional access, and federation. On the shared matrix it carries substantially more enterprise capability than Firebase Auth. The trade is the Microsoft-platform gravity that comes with it.
- Best for
- Microsoft-centric organizations that want external identity inside Entra.
- Watch out for
- Pulls you toward the Microsoft platform; weigh that lock-in the same way you weigh GCP's.
Read the Microsoft Entra External ID profileSee Microsoft Entra External ID vs Firebase Authentication
Pain to pick
Map your specific problem to the pick that removes it.
| If your problem is | What fixes it |
|---|---|
| Want the bundled model without GCP | Supabase Auth |
| Need B2B Organizations and Enterprise SSO | Auth0 |
| Want modern DX and light B2B | Clerk |
| Stack is AWS | Amazon Cognito |
| Microsoft-centric organization | Microsoft Entra External ID |
| B2C passwordless at scale | MojoAuth, Stytch |
Comparison table
Pulled from each vendor's capability matrix. Last verified 2026-06-06.
| Capability | Firebase Authentication | Supabase Auth | Auth0 | Clerk | Amazon Cognito | Microsoft Entra External ID |
|---|---|---|---|---|---|---|
| Deployment | cloud SaaS | cloud SaaS, self hosted | cloud SaaS | cloud SaaS | cloud SaaS | cloud SaaS |
| Segment fit | B2C, developer tools | B2C, developer tools | B2C, B2B SaaS, enterprise | B2C, B2B SaaS | B2C, B2B SaaS, enterprise | B2C, B2B SaaS, enterprise |
| Pricing model | tiered MAU | tiered MAU | tiered MAU | tiered MAU | tiered MAU | tiered MAU |
| Native passkeys | ✕ No | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes |
| B2B Orgs / Enterprise SSO | Orgs ✕ · SSO ~ | Orgs ✕ · SSO ~ | Orgs ✓ · SSO ✓ | Orgs ✓ · SSO ✓ | Orgs ✕ · SSO ✓ | Orgs ~ · SSO ✓ |
| FedRAMP | ~ Partial | ✕ No | High (via Okta) | ✕ No | High | High |
| Fine-grained authz | ~ Partial | ✓ Yes | ✓ Yes | ~ Partial | ~ Partial | ~ Partial |
| Free-tier ceiling | 50k MAU | 50k MAU | 25k MAU | 10k MAU | 50k MAU | 50k MAU |
How to choose
- If you like the bundled model but want off GCP, use Supabase Auth (Postgres-native, OSS).
- If a customer is demanding Enterprise SSO, move to Auth0 for B2B Organizations and SAML.
- If the pain is DX and you are on React or Next.js, use Clerk, off GCP with light B2B built in.
- If you are not sure which ceiling matters most, answer six questions in the vendor selector.
FAQ
- What is the best alternative to Firebase Authentication?
- It depends on the ceiling you hit. For the same bundled auth model on Postgres and open source, pick Supabase Auth. If you need B2B Organizations and Enterprise SSO, move to Auth0. For modern developer experience off GCP, pick Clerk. For hyperscaler-native options, Amazon Cognito on AWS or Microsoft Entra External ID in the Microsoft cloud.
- Is there a free or open source alternative to Firebase Authentication?
- Yes. Supabase Auth is open source and self-hostable with a generous free tier, and it keeps the Firebase-style bundled model on Postgres. For full self-hosted CIAM, Keycloak and FusionAuth remove per-MAU cost entirely. See the open source CIAM page for the complete list.
- Does Firebase Authentication support enterprise SSO?
- Not in a first-class way. Firebase Auth and the paid Identity Platform tier focus on B2C and consumer federation; there is no real B2B Organizations model or enterprise SAML story. If an enterprise customer requires SSO, that is the signal to move to Auth0, WorkOS, or a comparable B2B CIAM.
- Can I migrate Firebase users without forcing a password reset?
- Usually yes. Firebase exports password hashes (scrypt with project parameters), and most targets can import them so users keep their existing credentials. Plan the hash-parameter mapping carefully; it is the step that determines whether the migration is seamless.
Further reading from the blog
Longer-form analysis on guptadeepak.com that pairs with this switching guide.
Keep reading
Editorial note
This page ranks on one stated axis and nothing else. Every vendor is scored on the same matrix, every pick links to its internal profile, and we take no vendor money, no affiliate links, no paid placement. If you believe a claim is inaccurate or out of date, see the disclaimer for how to reach the editorial team. Last verified 2026-06-06.