Hello!
The analytics team would like to announce that we have a new visualization for Unique Devices data. As you know Unique Devices [1] is our best proxy to calculate Unique Users. We would like to reiterate that the data is available in a public API that anyone can access [2]. We calculate Uniques daily and monthly.
See, for example, "Daily Unique Devices" for Spanish Wikipedia versus French wikipedia: https://vital-signs.wmflabs.org/#projects=frwiki,eswiki/metrics=UniqueDevice...
FYI that dashboard would not work on IE, only on Edge.
Thanks,
Nuria
[1] https://meta.wikimedia.org/wiki/Research:Unique_Devices [2] https://wikitech.wikimedia.org/wiki/Analytics/Unique_Devices