Free Geofencing
Free mobile location tools for user insights and creating audience segments. Use these segments in conjunction with your current marketing tools like email (MailChimp, Constant Contact) or push notiifications.
Geofences are generally for larger areas where you want to know if someone is walking by your store, by a competitor's, or coming into a particular location.
You would go onto a Google Map or some kind of other mapping product, you would identify the area that you want to geofence, and then the idea is you're creating these circular regions, or in some cases, creating shapes or polygons or in the buildings or locations you want to target.
Then the phone or your app is monitoring for that geofence, and as I go about my business, day to day, it's tracking that location in the background. You know immediately when someone breaches a fence, when they dwell there, or as they are about to leave.
Geofences can be used to target customers in physical locations, allowing you to trigger the right message, the right campaign, at the right time and place.