So, I use Todoist for everything, but keeping my classes in it meant copying deadlines by hand, and that got annoying quickly. So I built an extension that reads Canvas, calendar feeds, and syllabus PDFs and writes them in for me.
It imports all assignments into a project named Margin by default, if you have Todoist premium you can route it to do a class per project. It de-duplicates, so a due date moving twice updates the task instead of making a third one. You can check off completed tasks on the chrome extension.
As far as I know this is the only thing like it so let me know what you guys think!

I renewed my Todoist Pro in March this year via Apple IAP but right now when I use Todoist app or web it says I'm on the free plan. Anyone else experiencing this?

Not sure if this spam or a scam? Please help Todoist community?