No Viable Self-Hosted or Portable Notion Alternative Exists for Teams That Need Databases, Shared Spaces, and OIDC

Summary

Users actively hunting for a Notion replacement that supports multiple accounts with shared spaces, real database features, AND OIDC SSO come up completely empty. Every candidate fails on at least one essential requirement: SiYuan has no multi-user support, AppFlowy hides OIDC behind a paid tier, Outline lacks databases, Anytype lacks OIDC, and Huly is too resource-heavy. The user is frustrated because these 'aren't that many specific features,' yet nothing fits. This is a pure, unsolved market gap: security-conscious teams and self-hosters are trapped on Notion or forced into fragile workarounds because no indie-built alternative delivers the full feature set. Whoever ships a lightweight, self-hostable workspace with genuine relational databases and OIDC would capture a highly motivated, underserved, and currently invisible audience.