Vault 3 is described as 'stores your notes and photographs as an outline. Vault 3 organizes your information into categories and sub-categories that you specify. Vault 3's outline is easily and rapidly searchable. Vault 3 uses strong encryption to ensure the privacy of your personal data' and is an app in the Office & Productivity category. There are five alternatives to Vault 3 for a variety of platforms, including Windows, Linux, Android, Mac and Online / Web-based. The best alternative is NoteCase Pro. It's not free, so if you're looking for a free alternative, you could try Halna Outliner or Cardbox. Other great apps like Vault 3 are Tree Notes (Paid) and Forensic Notes (Paid).
NoteCase Pro is an advanced multi platform outliner that helps you organize your text notes into a document, with individual notes placed in the tree-like structure. Multilanguage support. Active hyperlinks supported. Free Open Source version (also portable):...
Tree Notes is a notes organizer for Windows that allows you to organize and manage all your notes in a tree structure with icons. Tree Notes is very easy to use and light-weight. Store and manage unlimited number of notes in a single database file.
Forensic Notes - Digital documents are easy to fabricate, lose or get hacked. Take you digital documentation into the 21st century with Forensic Notes. Secure. Private. Credible. Court-verifiable documentation - Replicates paper notebooks.