You could try Craft CMS. It has a UI layer for configuring your content and is much more flexible then the likes of Wordpress.
It’s got a nice publishing experience which makes it easy for clients and it has a GraphQL API built in so that you can send content to a mobile app. It’s not free but it’s a great CMS that isn’t focused solely on blog publishing.
It’s got a nice publishing experience which makes it easy for clients and it has a GraphQL API built in so that you can send content to a mobile app. It’s not free but it’s a great CMS that isn’t focused solely on blog publishing.