If you don't have a pen for your device yet, Drawboard PDF supports annotating with touch. It is easy to switch between using stylus and touch annotation in Drawboard PDF depending on what you prefer.
- Select the Main Menu pane
- Select 'Annotate Using Touch' from the bottom menu to enable touch mode annotation.
- Deselect to disable.
Note: If your device does not have a touchscreen, this option will not appear.