Callbook

Callbook keeps track of your return visits, Bible studies, and service hours, and it does so without sending your data anywhere.

TRUE ENCRYPTION
Your calendar is stored encrypted on your phone with a key derived from your password, and that password never leaves the device. If you enable synchronization, the copy that travels is sealed with that same key: neither Google, which stores it, nor I, who created the app, can read it.

NO ANALYTICS AND NO ADS
There are no trackers, no advertising, and nothing is sold. The app connects to exactly three services, and all three are listed in Settings, under the Where Your Data Lives section.

WHAT IT DOES
• People, return visits, and courses, with the publication and lesson you're on
• Who you're due to see today, and who you haven't seen in a while
• Service timer, with hours by category
• The monthly report in form format, ready to copy
• Territories and map, with the addresses you saved
• Encrypted backup, and JSON export if you want it readable

Synchronization is optional and per device. Without it, your phone has the only copy.