Mac is the planning desk
Use the larger board, menu-bar quick-add and keyboard-friendly interactions to shape the week.
iPhone is the pocket check-in
Capture a task, check something off or see what is next without opening a full project system.
Why sync matters for a weekly planner
A weekly plan is useful only if it survives the moment you leave the desk. iCloud sync keeps the same list available instead of creating a second mobile inbox that needs reconciling later.

Private by default
There is no separate Cadence account to manage. The app uses your own iCloud account for the cross-device workflow, which keeps the product small and the responsibility clear.
Start with the Cadence product page, then read about the features or compare it with Todoist.