Select hero (and enemy filter), calculate fighting results.
+ button is open registration activity.
This app supports English, Japanese, Chinese 繁体.
Calculate looks like FEH-Mass-Simulator, but this app has poor options.
Web App is here https://turanukimaru.github.io/FEHSIM/
Category : Tools
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Very unreliable, not customizable, cannot use for what it is intended, not recommended. UI is a mess.