  Privacy labels -- standardized, compact representations of data collection
and data use practices -- are often presented as a solution to the shortcomings
of privacy policies. Apple introduced mandatory privacy labels for apps in its
App Store in December 2020; Google introduced mandatory labels for Android apps
in July 2022. iOS app privacy labels have been evaluated and critiqued in prior
work. In this work, we evaluated Android Data Safety Labels and explored how
differences between the two label designs impact user comprehension and label
utility. We conducted a between-subjects, semi-structured interview study with
12 Android users and 12 iOS users. While some users found Android Data Safety
Labels informative and helpful, other users found them too vague. Compared to
iOS App Privacy Labels, Android users found the distinction between data
collection groups more intuitive and found explicit inclusion of omitted data
collection groups more salient. However, some users expressed skepticism
regarding elided information about collected data type categories. Most users
missed critical information due to not expanding the accordion interface, and
they were surprised by collection practices excluded from Android's
definitions. Our findings also revealed that Android users generally
appreciated information about security practices included in the labels, and
iOS users wanted that information added.
