Plexii is a local-first productivity workspace for Mac and Windows that gives each task its own dedicated desk, combining docs, sheets, slides, notes, and browser windows on a single canvas. It includes a built-in office suite supporting real .docx, .xlsx, and .pptx files, alongside an AI assistant powered by Anthropic's Claude that answers questions grounded in the user's own local files with citations. Users can close a desk to clear clutter and reopen it later with everything preserved exactly as they left it. Plexii offers a free personal tier and paid plans for individuals and teams, with optional self-hosting and enterprise features for larger organizations.