Cosmil

Cosmil is a file manager for macOS, designed to look and feel like a modern and refined file explorer rather than a utility. The interface is deliberately minimal with window transparency and background blurring so the window blends with whatever's behind it. How much you want going on is up to you — the sidebar, every pane, and the preview are all resizable, and most of the interface can be dialed back or turned off.

Each window supports splitting into as many panes as fit on screen — two, three, four, or more. Workspaces are restored on relaunch, with the same windows, tabs, active directories, and pane layouts you left open. It also closes the gaps people build workarounds for in Finder:

• Cut and paste with Cmd+X / Cmd+V (Finder's Cmd+C / Cmd+Opt+V move behaviour is still available if you prefer it)
• Cmd+N creates a file of any type, not just a folder. In tree view, new files, new folders, and pastes land inside whichever folder is selected rather than the one you're browsing
• Folder sizes calculated on demand for any selection (Cmd+Shift+S), instead of one Get Info window at a time or an always-on setting that crawls the drive
• File conflicts show both files in full: previews, parent folder, size, and created / modified / accessed dates, so you can tell which one to keep
• Icon view follows a strict order; files don't drift out of the pane or create a horizontal scroll bar
• A dropzone in the sidebar to park files mid-drag while you navigate or create the destination folder
• A job manager listing active transfers and searches, each cancellable
• Open With works on folders, not just files
• Custom sidebar categories with names you choose, not one flat Favorites list

Native macOS behavior is kept where it already works: spacebar QuickLook on any selection, and the system share sheet for AirDrop and Messages. The backend is written in Rust (Tauri 2 and Svelte 5). No analytics or telemetry — the only network requests are license verification and update checks.

Cosmil is a one-time purchase, licensed for 1, 4, or 6 Macs, with no subscription. There's no trial build, but refunds are available within two weeks by email.