Hi @AP, we actually have exit-intent popups built right into the Marketing tool! Indeed, Lead Flows (previously under the Leadin brand but, as of last week, belonging to Marketing Free) allow you to create a pop-up form upon exit intent. Read more about Lead Flows here: Boost Conversions with Free Lead Generation Tools | HubSpot.
You can select the Exit Intent option while configuring your Lead Flow, under Lead Flow Options:
We also have a few available integrations with softwares that offer exit-intent popups. OptinMonster is one of them; you can read more about this integration here: http://optinmonster.com/docs/connect-optinmonster-hubspot/
May