Free forever. Upgrade for multi-impact, tsunamis, and the big ones.
Historical + Hypothetical
Every scale of catastrophe.
20m
Chelyabinsk
2013
Airburst over Russia. Shattered windows across 6 cities.
60m
Tunguska
1908
Flattened 2,000 km² of Siberian forest. No crater.
150m
City Killer
~150m
1,000 Mt yield. Enough to erase a major metro.
370m
Apophis
2029 flyby
Near-miss in 2029. 1,200 Mt if it hit.
1km
Regional
~1km
Continental devastation. Global dust veil.
12km
Chicxulub
66M BP
The dinosaur killer. 100 trillion Mt. Mass extinction.
Backed by Real Models
Every impact, modeled.
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Kinetic Energy
Real physics. Mass × velocity² scaling. Atmospheric survival factor baked in.
🕳
Crater Scaling
Pi-group crater formation laws. Density and impact angle factored.
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Thermal + Blast
Cube-root yield scaling from nuclear test data. Severe / moderate / light rings.
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Ocean Tsunamis
Wave height and reach for ocean impacts. Water depth scaling (Pro).
☁
Impact Winter
Stratospheric dust, sun blocking, crop failure estimates for large impacts.
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Casualty Model
Population density raster + mortality rings. Real exposure numbers.
Simple Pricing
Free to play. Pro to go big.
Free users get 1 impact up to 5km, plus real crater/blast/thermal. Pro unlocks 3 simultaneous impacts, asteroids up to 20km, ocean tsunamis, side-by-side compare, CSV export.