HR is the people who work here: their record, their time off, what they are paid and how they arrived. These apps keep one file per person, rather than one spreadsheet per question somebody once asked.

The employee file your company runs on. Records, onboarding, time off and org insights.
Leave from the request to the day off, with a yearly balance summed from the requests behind it rather than typed. Approved leave shows up in the shared calendar.
A candidate pipeline from application to offer. Stages, interviews and notes on one page per person.
Run payroll month by month. Gross to net for each person, with the run itself kept as the record.
Review cycles with self, manager and peer feedback, where the person reviewed sees the averages and never the individual answers.
Every app here installs on its own and works on its own. Adding a companion is what makes both do more.