Last updated: February 2026
Heimdallr is a real-time natural disaster monitoring application that displays publicly available data about earthquakes, volcanic activity, tsunamis, wildfires, cyclones, and severe weather alerts on an interactive map. This privacy policy explains how the app handles your data.
In short: Heimdallr does not collect, store, or share any personal data. Everything stays on your device.
Heimdallr stores the following data exclusively on your device using your browser's local storage. This data never leaves your device and is not accessible to us or any third party:
All locally stored data is deleted when you uninstall the app or clear the app's data through your device settings.
Heimdallr fetches publicly available data from the following government and scientific sources. These requests are read-only (the app only downloads data, it does not upload any information):
| Source | Data | Provider |
|---|---|---|
| USGS Earthquake Hazards | Earthquake data | U.S. Geological Survey |
| USGS Volcano Hazards | Volcano alert data | U.S. Geological Survey |
| INGV | Italian seismic data | Istituto Nazionale di Geofisica e Vulcanologia |
| EMSC | European seismic data | Euro-Mediterranean Seismological Centre |
| NWS | Tsunami alerts (US) | National Weather Service (NOAA) |
| GDACS | Global disaster alerts | Global Disaster Alerting Coordination System (UN/EC) |
| NASA FIRMS | Satellite fire hotspots | NASA |
| NIFC | US fire perimeters | National Interagency Fire Center |
| Smithsonian GVP | Global volcano catalog | Smithsonian Institution |
| WMO SWIC | Severe weather alerts | World Meteorological Organization |
| Where the ISS at? | ISS position | Open community API |
Heimdallr uses MapTiler for map rendering, weather overlays, and reverse geocoding of wildfire hotspot coordinates. When the app loads map tiles or performs geocoding, your device sends requests to MapTiler's servers that include the geographic coordinates being viewed or queried. MapTiler's handling of this data is governed by their privacy policy.
The web version of Heimdallr uses Cloudflare Web Analytics to collect anonymous, aggregate page view metrics (e.g. page loads, referrers, country). This service does not use cookies, does not collect personal data, and does not track individual users across sites. Cloudflare's handling of this data is governed by their privacy policy. The Android app does not include any analytics.
On the web version only, some API requests are routed through a self-hosted Cloudflare Worker that acts as a CORS proxy to work around browser security restrictions. This worker forwards requests to public data sources and returns the responses — it does not log, store, or inspect any request data. The worker's source code is part of this project. On the Android app, all requests go directly to the data sources via the native HTTP layer and no proxy is used.
Heimdallr can send local notifications to alert you about new natural disaster events. These notifications are generated entirely on your device based on data already fetched from public sources. No notification data is sent to any server. You can disable notifications at any time in the app's settings or through your device's notification settings.
On Android, Heimdallr can optionally run a background monitoring service to continue checking for new events while the app is not in the foreground. This service runs entirely on your device and does not transmit any data to us. You can enable or disable this feature in the app's settings.
Heimdallr does not knowingly collect any personal information from anyone, including children under 13. The app displays publicly available scientific data and does not contain advertising, in-app purchases, or social features.
All network communication uses HTTPS encryption. The app enforces a strict Content Security Policy and does not allow cleartext (unencrypted) traffic.
Since Heimdallr does not collect any personal data, there is no personal data to access, correct, or delete. All app data stored locally on your device can be cleared by:
We may update this privacy policy from time to time. Any changes will be reflected in the "Last updated" date at the top of this page.
If you have questions about this privacy policy, you can reach us at worldviewheimdall@gmail.com.