HomeSweetHome starts a timer automatically as you leave your home wifi network.
After that, it reminds you every 15 minutes* so you won't overspend time away from home.
HomeSweetHome relies on wifi information for sending reminders. It does not require cellphone data, does not acquire your GPS location** and is a not-for-profit public service.
** Location permission is requested for retrieving wifi ssid information (per SDK requirement)