I'd like you to consider doodledocs.com, which is my side project. I recently submitted it as a show HN [1].
It has a web annotation feature in which you can draw over a website with your stylus. I haven't seen the combination of a pressure sensitive stylus web annotation collaborative doodle app.
It's still very much an MVP though, so the collaborative aspect doesn't always work. The annotation aspect should work a lot better.
I wish I could pursue this project as a small company (I have quite a lot of ideas in this area), but I'm having a hard time finding the audience who might enjoy this (currently that says more about my marketing skills than anything else). So side project it is.
Edit: Bluebeam, Good Notes and Apple Books are missing [2]. It seems that there is no consideration for stylus-based annotation.
It has a web annotation feature in which you can draw over a website with your stylus. I haven't seen the combination of a pressure sensitive stylus web annotation collaborative doodle app.
It's still very much an MVP though, so the collaborative aspect doesn't always work. The annotation aspect should work a lot better.
I wish I could pursue this project as a small company (I have quite a lot of ideas in this area), but I'm having a hard time finding the audience who might enjoy this (currently that says more about my marketing skills than anything else). So side project it is.
Edit: Bluebeam, Good Notes and Apple Books are missing [2]. It seems that there is no consideration for stylus-based annotation.
[1] https://news.ycombinator.com/item?id=21399910
[2] As an aside, I recommend Good Notes over Apple Books, but it's close. Bluebeam is a good application if you have a Microsoft Surface.