An Entra ID Alternative For Teams Keeping On-Prem AD

For organisations that cannot put the directory in a vendor cloud: keep Active Directory on-prem, add SSO and MFA, and enable remote work with no hybrid join.

Review your identity path with an engineerBook the readiness review

What this actually does

Sometimes the blocker is not the licence, it is the constraint: data localisation, CERT-In, DPDP, an air-gap requirement, or a board that will not sign off on the directory living in somebody else’s cloud.

The directory stays on your infrastructure.
No synchronisation, no hybrid join, and no copy of your user objects held by a third party.
Single sign-on over OpenID Connect, OAuth2, and SAML 2.0 with TOTP multi-factor authentication (RFC 6238), run against the identity you already have.
Where you do use cloud identity, federation is available rather than mandatory. Google Workspace, Microsoft Entra ID, LDAP, and Active Directory can all be mapped to one login.
Run the control plane on infrastructure you nominate and administrative audit trails and session logging stay inside your estate, which is the part auditors actually ask about.
An honest note on cost
Entra ID P1 is bundled with Microsoft 365 E3 and P2 with E5, so if you are on those tiers the licence is not your saving. The hybrid-join project, Azure AD Connect as production infrastructure, and where the directory lives are the real questions.