Obsidian

Obsidian is a free and flexible note-taking and knowledge management application that stores notes privately on the user's device. It allows users to create connections between notes, visualize relationships through a graph, and organize ideas visually with an infinite canvas. It is highly customizable with thousands of community plugins and offers optional add-on services for syncing notes across devices and publishing notes to the web.

Obsidian is primarily a knowledge base and note-taking application, not an AI-powered file organizer. While it offers features like syncing notes across devices (which implies cloud storage integration for its own sync service) and emphasizes privacy by storing notes locally and offering end-to-end encryption for sync, it does not provide AI-driven file organization, chat with files, or semantic search as core functionalities. The 'Plugins' section shows community-developed plugins, some of which might offer AI capabilities (like 'MantouAI' or 'Khoj AI'), but these are not core features of Obsidian itself and do not align with the 'AI File Chat' or 'Semantic Search' features described for Dynbox. Therefore, it only partially matches some 'must-have' features related to data handling, but not the core AI organization aspects.