Show HN: OfflineVault – AI based offline library for when the internet is down

OfflineVault is a macOS app (Apple Silicon, macOS 14+) that bundles an offline library of emergency and reference content—a 95-article Field Guide, CDC/FEMA preparedness material, MedlinePlus, iFixit manuals, medical wikis, Wikipedia and maps—with an on-device AI assistant that answers only from the stored books and cites the passage it used. On 150 emergency questions tested through the app, the default model scored 63 fully right, 73 partly right, 4 wrong and 0 harmful, and refused all 10 questions it should refuse; every wrong answer is published. It has a free tier with no account, paid Core ($149) and Household ($249) plans, is GPL-3.0 open source, and offers ovsync for Linux and Windows via Kiwix.