What is the difference between HR automation software and an HRIS?

An HRIS (Human Resources Information System) is a centralised platform for managing all employee data, payroll, and HR functions. HR automation software specifically refers to the workflow and process automation layer — the technology that triggers actions, sends notifications, routes approvals, and eliminates manual steps. Many modern HRIS platforms include built-in automation capabilities, so the two often overlap. Omni, for example, is an HRIS with native workflow automation built in — no separate tool required.