Yes, クイズ検定 for ワイテルズ(white tails) is completely free and it doesn't have any in-app purchases or subscriptions.
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クイズ検定 for ワイテルズ(white tails) is free.
To get estimated revenue of クイズ検定 for ワイテルズ(white tails) app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.