xCluster does not collect, store, or have access to any of your personal data. Individual settings relating to xCluster are not personal and are stored only on your device. Some non user data is stored in your iCloud account.
Location data is used to personalize your experience but is never tracked or stored, this can be turned off without affecting the apps functionality.
Credentials for the QRZ.com website are stored locally on your device if you have selected to use this feature.