Every enterprise has accounts built for exactly 1 user: AWS root, exchange logins, DNS registrars, social accounts. Your IdP cannot federate them and workforce MFA cannot share them. That is the gap Castle governs.
Policy controlled, just in time access to shared TOTP credentials for single owner accounts. Quorum approvals, geofenced windows, zero knowledge seed custody, and a display level audit trail, all bound to your IdP.
Authenticates your people into apps built for teams: push verification, WebAuthn, device trust, adaptive login policies. Castle assumes you keep it. The 2 share your IdP and do different jobs.
Stores an individual’s own TOTP tokens with cloud backup and multi device sync. No policies, no approvals, no audit trail, no enterprise controls. Desktop app discontinued in 2024.
Where the products overlap and where they were never designed to compete.
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Keep it. Duo authenticates your workforce into apps built for teams. Castle governs the accounts built for exactly 1 user, where the only credential is a shared login and a TOTP seed. The 2 do different jobs and share your IdP.
A password manager shares the seed itself. When someone leaves, the seed leaves with them and every account needs rotation. Castle shares access, never the seed: offboarding is 1 revocation, and every code display is logged with user, device, and location.
No. Castle binds to Okta or Microsoft Entra / Azure AD. Members sign in with enterprise SSO and receive exactly the seeds they are entitled to, on any approved device, with no per-seed re-enrollment. Castle consumes identities; it never issues them.
Per-user push MFA and WebAuthn for workforce apps stay with Duo or your IdP. Castle does not compete for that job.
Codes display on enrolled mobile devices only. Hardware backed device keys are part of the trust model, not a missing feature.
Castle does not issue or federate identities. It binds to the identity infrastructure you already run.
Bring the accounts your IdP cannot reach. We will map them to policies in a working session.
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