Greenlight
I use Greenlight with the kids - it’s an app/service that gives the kids a sort of bank account/savings/investments tool that parents have top level control of, but the kids can also utilize independently. They have their own isolated account that they can view and manage with an App. They also have their own bank cards they can use. The purpose of course is to give them access to their own resources, and let them learn how manage their own finances and set their own savings goals. It’s a bit pricey but it works pretty well and I have been happy with it.