What is the best alternative to Cozi? (shared calendar and list app)

My wife and I have been using Cozi for years to manage our work schedules, plan dates, block off personal time, and manage grocery lists and to-do lists. There has been some pretty egregious enshittification through locking more and more essential features behind a paywall and now it's altering times for some reason and straight up losing list items and calendar entries. I'm done. Its only function was to maintain calendar items and lists so I wouldn't need to manually remember everything; it's worthless if I can't trust it to remember for me.

So now we're looking for a replacement tool to manage our family. FOSS preferred, but not required. I'm even open to using two separate apps for it, one for calendar and another for lists. We just need them to live online so we can independently add to it while the other person is asleep or at work.

I'm hoping that somebody else has already done the legwork to find the best option?