There are also some CRMs that integrate better with macOS tools like Apple Mail and Contacts than others. However, there are some Apple only CRMs such as Daylite which is designed specifically for macOS and Apple devices.
Nowadays, most Customer Relationship Management software are SaaS (Software as a Service) cloud based systems that run in any web browser on a Mac or PC. Rather surprisingly, Apple don’t make CRM tools for either macOS or iOS. There is currently no such thing as a CRM software made by Apple. Really Simple Systems CRM (Best CRM For Accounting) Less Annoying CRM (Best CRM For Small Business)