My apps do not use any information that you do not explicitly give them.
The only information they may store is a name you typed in, reminders that you requested, or, in the case of PeePal, your current location. Even in those cases, all information is stored locally; I do not have access to it. PeePal uses your location (if you grant it) to show you restrooms near you, and it is sent (with no identifying information) to the Refuge Restrooms API. Refuge Restrooms reveives only a latitude and longitude, so it neither receives nor stores your personal information.