Which digital calendar is best if you need your kids to use it, not just you
Most of the comparisons I found online were written for adults who want a shared family schedule. Like I get it it's useful but it's not the whole problem. My issue wasn't that my husband and I couldn't coordinate, he's a sweetheart and does an amazing job, it's that my kids had no relationship to the calendar at all. They didn't check it, they didn't know what was on it, they just waited for me to tell them what was happening and then forgot immediately 🥲
So I evaluated everything through that lens specifically. Which options work for kids, not just for parents trying to organize kids.
Google calendar and cozi: not even close, they have adult interfaces, require reading, no visual scaffolding, nothing a little one could navigate. Useful for adult coordination but your kids won't be able to use that
Skylight: much better, the display is clear and always visible and my younger kiddos could at least see the calendar even if they weren't really interacting with it. The calendar view is good for shared visibility. Routines are limited though and there's no real mechanism for kids to feel ownership over their day, it's still something the parent controls and the kid observes.
Hearth: similar as above but the thing that separated it for me was that it's designed with kids in mind (finally!) The routine icons work for pre readers and the reward system gives them a reason to engage. Also it gives you an option to see if routines are actually happening, like I can see who's participating and where things are falling apart, which is different from just seeing what's on the calendar. My 7 yo sweetheart now checks her routine without being asked. That didn't happen with anything else we tried.