BlastSim for iPhone

BlastSim — Tool summary

BlastSim is a no-cost utility designed to estimate the ground area impacted by a nuclear detonation. It provides rapid calculations to visualize blast footprints and supports quick scenario comparisons for different weapon sizes.

Intended users and scenarios

BlastSim is aimed at individuals performing independent research, educators preparing demonstrations, and planners considering evacuation or civil-protection measures. It’s not a decision-making authority but a learning and analysis aid.

Main features

• Built-in simulation engine that produces affected-area estimates from a weapon yield
• A searchable catalog of historically tested devices and their yields
• Support for entering a custom weapon yield (kilotons) for on-the-fly scenarios
• A streamlined interface for quick input and fast results suitable for classroom use or preliminary planning

Historical devices included

• Tsar Bomba (largest tested device)
• Fat Man (World War II-era implosion design)
• Little Boy (World War II-era gun-type device)

How to provide a custom yield

1. Select the custom-yield option in the app.
2. Enter the desired number representing yield in kilotons into the input field.
3. Press the Set control to apply the value and run the simulation.
4. Review the generated map and summary to see the estimated affected area.

Typical uses and limitations

• Useful for educational demonstrations, initial research comparisons, and preliminary evacuation planning
• Not a substitute for professional hazard assessment, emergency services directives, or classified modeling tools
• Results are estimations intended to illustrate scale and relative impacts rather than provide legally binding guidance