Porting an app using Core Data to Realm is very simple indeed. If you have an app that already uses Core Data, and have been considering the move to Realm, this step-by-step guide is for you!
Many of the developers featured on our Users page once had apps with deep Core Data integration (sometimes with thousands of LOC), and many will tell you that the conversion process took only a few hours. Core Data and Realm both handle your data as objects, so migration is usually very straight-forward: simply take your existing Core Data code and refactoring it to use the Realm API.
After migrating, you should be thrilled with the ease of use, speed, and stability that Realm can bring to your apps.