I’m looking for an application for managing of time-sensitive reminders. For less time critical things, I’m perfectly fine with having e-mail reminders. But for those “do <X> at 18:00” kinds of reminders, I was always using the default iOS Reminders application.

Now I’m trying to reduce my dependency on Apple ecosystem, so I’m looking for something that:

1. is multiplatform (iOS + Android, no desktop application needed)
2. allows sharing of lists with other people (for example, grocery lists that I’m sharing with wife that we can both contribute to)

Nice bonus would be if it wasn’t behind a subscription, but rather a one-time payment. Is there something like that which is also European?