My iOS and Mac apps do not share your personal information with me or other people. Information is only exported from your device when you choose to share or export data via email, save to Dropbox or iCloud, or backup to iTunes or iCloud. Attendance2 uses the Dropbox SDK (so that you can import CSV files from your Dropbox folder and backup/restore data to the folder) but they claim they don’t use your data. I do view crash reports collected by Apple if you chose to share those with developers when you set up your device but those do not contain any personal information about your device.