Flashline

Support

Contact

Questions, bugs or suggestions: digitalstructures@proton.me

Getting started

Hold your phone up to the sky. The weapon, distance and burst height are in the panel at the bottom; tap it to change them.
Slide to detonate. The flash, heat, shock wave, sound and cloud arrive when the physics says they would at your distance.
Not near a window or outdoors? Turn on Settings › Preview without camera to use a generated landscape, and drag to look around.
Tap the map button to pick ground zero anywhere, and see the damage rings and casualty estimates.

Common questions

The flash is too bright. Lower Settings › Flash brightness. At 0% the flash is a soft fade. iOS Dim Flashing Lights and Reduce Motion are also respected.
The compass or sun looks wrong. Allow location access ("While Using"), and move the phone in a figure eight to recalibrate the compass.
No casualty estimate. The bundled population map covers North America. Elsewhere, Flashline shows the damage rings without casualty numbers.
Screen recording. Recording runs with sound needs iOS 27 or later.
Phone gets warm. The rendering is demanding. The experimental "Destruction in camera view" setting adds an on-device model and extra heat; leave it off for longer sessions.

About the numbers

Effects are computed on your device from declassified public models (Glasstone & Dolan 1977, Kingery–Bulmash; WSEG-10 for fallout). Casualty estimates use the OTA (1979) overpressure model and GHSL population data. They are estimates for understanding, not predictions.

Privacy

Flashline collects no personal data. Read the privacy policy.