Use 'just now' to emphasize that an action occurred only seconds or minutes before speaking.

Immediate Past

Adding 'just' to 'now' highlights the recentness of an action more than using 'now' alone.

Emphasis on Recency

'Just now' is often used in casual conversations more than in formal contexts.

Suggests you're occupied at precisely this moment and cannot be disturbed.

Indicates an action will happen immediately or that you beg to delay a request for a short while.

Signals to the speaker that you will attend to them shortly, without specifying exactly when.