18 March 2026 · Isolde Venn
DAU is a coastline, not a score
Boards like a daily active number because it behaves like a score. It goes up, someone is winning; it goes down, someone should fetch a rescue. App Analytics, practised as survey work, cannot afford that metaphor. A coastline is wet twice a day and dry in between. Nobody calls the afternoon sand a failure of the island.
When a United Kingdom consumer app reports DAU to trustees, the missing plate is the tide table: which events count as “active,” whether a background refresh is allowed to wet the sand, and what the product’s real return rhythm is. A meditation guest who opens the app on Sunday night and a marketplace seller who lists stock every other Thursday will never share a honest daily score. Printing one anyway is how a quiet fortnight becomes a “crisis” in a pack.
In the Plot Room we ask students to draw seven days of the same users as a coastline: high water (the defining behaviour), slack water (opens that do not count), and the rocks (events that were never behaviours). The drawing is crude. It is also the first time many desks see that their DAU is mostly spray from push notifications.
None of this means you should hide the daily count. It means the weekly plot may show DAU only beside its window and its excluded verbs. If finance wants a single trophy, the honest answer is that App Analytics does not mint trophies. It surveys a shore.