Obsidian is the best thinking and knowledge-base tool ever built for one person. VaultGuard makes it work for a team. It adds encrypted sync, per-file permissions, share-links, AI chat, guest access and audit logs to the vault you already have — no migration, no new app to learn. You write exactly as you do today; VaultGuard protects who can view and work with the files. Point Claude or GPT at the vault and the AI inherits the same permissions your people do. Free if you self-host.
