The Obsidian Things3 Sync plugin allows seamless synchronization of todos, tags, and dates between Obsidian and Things3. It works cross-platform on macOS and iOS, and supports multiple languages for creating todos. Users can easily create or toggle todos in Things3 directly from Obsidian, with tag support tied to Things3's existing tags. Dates in Obsidian notes are also transferred to Things3. Additionally, each todo created in Things3 includes a backlink to the corresponding Obsidian note.