CapMind
Four ways in: a global shortcut for a floating text editor, a second one for a crosshair that captures a region of the screen at native resolution, drag-and-drop onto the menu-bar icon for files, links and selected text, and an entry in the macOS Services menu for whatever is selected anywhere else.
It is write-only, and never lists or searches what is already in MyMind.
Checks size and format up front, so an unsupported file never starts uploading.
The sibling of CapNote: the same idea for a different service, on the same architecture.
Built with Swift, SwiftUI, macOS.