Use 'stop in' to imply your visit will be brief, not taking up a lot of time.

Short Duration

'Stop in' often indicates a casual, friendly visit rather than a formal one.

Friendly Gesture

Imply no need for elaborate preparations or formalities for the host when using 'stop in'.

Use 'stop in' when briefly interrupting an ongoing activity or journey.

'Stop in' can specify a particular place you visit temporarily during a trip.

'Stop in' is often used when describing breaks or pauses in travel plans.