Project management is the work itself: the projects, the tasks under them, and the hours that went in. These apps answer what is being done, by whom, and how far along it actually is.

Plan and track delivery across projects. Tasks, sections, a board, a timeline and cost rollups.
Log hours against the projects the Projects app already tracks — one project list, not a second copy. Weekly entry, an approval step, and a report of where the time went. Install Projects alongside it.
Every app here installs on its own and works on its own. Adding a companion is what makes both do more.