Animation Workshop includes professional animation tools such as Onion Skin that allows you to see the previous semi-transparent frames to use as a reference when drawing the current frame.
It also includes a draft layer to draw some reference lines whose visibility you can activate or deactivate and that will help you make the final drawing.
At any time you can press the preview button to see the result.
With Animation Workshop you can get animation clips in high quality image sequences, however this application is aimed at animation professionals who want to do a quick test to experiment with strokes, characters and movements.