Tremula

Track earthquakes, weather alerts, floods, wildfires, asteroids, solar activity, APOD, and the ISS in one live Earth-and-sky awareness app.

Tremula helps you see what is happening around Earth and above it.

Track nearby earthquakes, official weather alerts, flood activity, wildfire and thermal hotspot detections, asteroid close approaches, solar activity, NASA astronomy images, and the live position of the International Space Station.

Tremula brings together public data sources into one simple app so you can quickly understand local and global activity.

Features include:

• Nearby earthquake activity
• Official weather alerts from the National Weather Service
• Flood and water-related awareness
• Wildfire and satellite thermal hotspot context
• Asteroid close approaches
• Solar flare and coronal mass ejection activity
• NASA Astronomy Picture of the Day
• Live ISS location with map follow mode
• Interactive map of Earth and sky activity
• Event details with source and freshness information
• Optional notifications for important activity
• Background checks when iOS allows them

Tremula uses public data sources including USGS, NOAA, NWS, NASA, and other public space and Earth science feeds. Some NASA-backed requests are routed through a small Cloudflare Worker to keep API keys out of the app.

Background checks and notifications are best effort. iOS decides when background refresh is allowed based on battery, network, device usage, and system settings. Tremula should not be used as a sole source for emergency decisions. Always follow official local guidance during severe weather, wildfire, flood, earthquake, or other emergency events.