The website is great for drawing surprisingly! It doesn’t have a fill-in bucket, but that’s due to it being infinite probably. If you’re looking for a collab site for doodling with your friends, that’s what you’re looking for! If you have any ideas on what could be added, you can always contact the devs, they usually respond and are super helpful :).
Update: I am happy to edit my review to inform everyone that now Whiteboardfox offers a bucket feature!
It is very good for doodling random ideas! make sure to have fun and keep being creative! It is down sometimes though ;-;
Witeboard - A real-time whiteboard for your team. No signups required.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Mural - MURAL is a visual collaboration workspace for modern teams.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Whiteboard Team - Draw, explain and collaborate visually in real-time.
Slack - A messaging app for teams who see through the Earth!