App Record Details is built on Lightning Web Components and lightning data services. It has User Interface exactly similar to that of standard layouts in lightning experience. An intuitive UI for the configuration page where all customization is hasslefree.
More information can be found here https://quip.com/vG4wAO8OE0Bb
This app is designed to be installed in your Salesforce Licensing Org. You can install it from the AppExchange here https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3A00000FZGrDUAX