HRIS, HCM, and HRMS are very similar in functionality, and professionals often use the terms interchangeably. While these programs offer automated human resource processes and digital tools under the umbrella of an all-in-one HR software suite, the main distinction between programs is a matter of scope. HCM tend to have more functionality than HRIS, and HRMS typically are the most comprehensive of all. Also, while HRIS often service only the US, the other two options have varying global functionality.