GanttReflect 4+

This utility allows you to easily view and update clipboard data using an ad-hoc Gantt chart.

Simply place tab delimited data including time information – formatted as short date values that conform to your region (like M/D/Y for United States – from your favorite spreadsheet app such as Numbers or Microsoft Excel® into clipboard, open GanttReflect, configure, view, and update contents either by dragging Gantt chart bars around or by editing values directly in the associated grid, and paste changes back into the original document, or somewhere else, as needed.

For convenience, you can also export the Gantt chart presented by the app as PDF or PNG image files on the fly.

The app does NOT need access to your original spreadsheet files, and will only access the clipboard when you actually activate the app. All processing is done locally so your privacy is highly protected, and the app works offline too.