With the Scale Calculator, you can look up the most common scales and modes. Select the mode and press any note to show the scale starting from that note.
If you don't want to hear the sound as you tap a note you can mute the piano with the mute switch in the upper left corner on top of the piano!
If you want to show C# as Db just flip the Sharps/Flats switch in the upper left corner on top of the piano!
You can see the notes spelled out on the right side. The scale will be displayed on the staff as well. The notation is also correct with regards to double flats and double sharps.