NotesDB, a fully offline app, runs quietly in the background and watches your clipboard. Copy a paragraph from a PDF, a quote from a browser, a line from an email — a small "Save note" prompt appears near your cursor. Click it, or ignore it and keep working. You never alt-tab, never open a separate app, never lose your train of thought. It saves the source too, the source's offline or online location as well as its citation.
