Drawpile is a simple sketch tool that enables you to share your art with other users, and they can draw something at the same time as you. The core drawing tools are the ones you are familiar with from other design programs, and this program supports a wide range of colors to choose from. You can even add text annotations if you want to.
It supports blending modes and also layers, which means that this program is much more powerful. It even works with pressure-sensitive Wacom tablets too. You can make use of this tool on your own, but it can get much more interesting when others join also, and it is straightforward for them to participate.
You can open the “Host” a session dialog and give your session a title and a password. After that, all you have to do is to click on “Host”. Other users who want to help you with your art can connect in seconds using the password you provide them.
Drawpile handles 20 users without any problems as long as your bandwidth is up to it. The built-in text chat should help you, and the session creator can also undo some actions made by other users.
When the course is finished, the completed image can be saved in different formats such as BMP, PNG, and JPG. You can even record the sketching process repeatedly, then replay it later or export it as an image series or as a video.