Help and contact for the CHIRAKU app
Q. What devices are supported?
iPhone / iPad with iOS 13.0 or later, and Android 5.0 (API 21) or later. Phones and tablets are both supported.
Q. Does it work offline?
All simulations work offline. Network is used only to deliver ads.
Q. Is it OK to use in classrooms?
Yes. Free to use in schools, tutoring, and personal study.
Q. How accurate are the simulations?
They use simplified, textbook-level models (Omori's formula, Green's law, Snell's law, dipole field, and so on). Do not use them for disaster preparation, earthquake forecasting, or volcanic-activity assessment. Refer to official agencies (JMA in Japan, USGS, etc.) for real decisions.
Q. Are there in-app purchases or subscriptions?
No. All features are free. The app shows a single AdMob banner ad.
Please include the following when reporting issues:
CHIRAKU is an educational app with seven earth-science simulations: plate tectonics, seismic waves, epicenter location, volcanic eruption, lava flow, earth interior, and geomagnetism. Each runs in four discrete phases ending at a real-world endpoint.
Version: 1.0.0