DatapodsInsights

NINA App Install Spikes on Germany's Warning Day

Results as of

Review 2023–2025: NINA's daily install share spikes 4–8× its baseline every year on Germany's national warning day.

NINA App Install Spikes on Germany's Warning DayLine chart showing NINA's daily share of all Google Play installs from August 2023 to October 2025, with three sharp upward spikes aligned exactly to the Warntag dates in September 2023, 2024, and 2025. The y-axis shows the install share; the x-axis shows calendar date.Line chart showing NINA's daily share of all Google Play installs from August 2023 to October 2025, with three sharp upward spikes aligned exactly to the Warntag dates in September 2023, 2024, and 2025. The y-axis shows the install share; the x-axis shows calendar date.
Line chart showing NINA's daily share of all Google Play installs from August 2023 to October 2025, with three sharp upward spikes aligned exactly to the Warntag dates in September 2023, 2024, and 2025. The y-axis shows the install share; the x-axis shows calendar date.
Info
Sample size
n = 34,061
Data date
2023–2025
Segment
All segments
Platform
Play
Market
Germany

Analysis

Germany's NINA emergency app — operated by the Federal Office for Civil Protection and Disaster Assistance (BBK) — sees a sharp, predictable surge in Google Play installs every time the nationwide warning siren test triggers. The effect is consistent across all three observed Warntag dates: September 14, 2023; September 12, 2024; and September 11, 2025.

The alarm that sells itself

The Warntag reaches citizens through sirens, Cell Broadcast, and apps simultaneously — and the probe alarm is itself the most effective advertisement NINA has. In the BBK's post-event survey for Warntag 2025, 97% of respondents reported receiving a warning through at least one channel, with warning apps reaching 67%. Cell Broadcast has operated in Germany since February 2023 and now co-exists with NINA rather than replacing it: Cell Broadcast fires the initial alert, while NINA delivers location-specific detail and police warnings added in July 2025. Each September test reliably converts that moment of public awareness into a discrete install wave — a pattern now visible across three consecutive years.

This analysis is based on public segment data. For deeper cuts, use our Enterprise interface.

Methodology

The metric is NINA's share of all Android app installs recorded on a given day among German smartphone users tracked via Google Play activity logs, covering the period August 2023 to October 2025. Expressing installs as a daily share rather than raw counts controls for panel growth over time. The three Warntag dates — September 14, 2023; September 12, 2024; and September 11, 2025 — are compared against the surrounding daily baseline to derive the spike multiple.

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