No revenue estimate for the App Store: Apple publishes no install counts, and its star-rating counts don't calibrate to sales the way Steam's written reviews do. Reviews and prices only.
日本史の語呂合わせ暗記でフリック練習帳
ただフリック入力の練習をするよりも、ついでに日本史の年代順と語呂合わせで勉強もしちゃおう！フリック入力が上手くなる頃には日本史も時系列で暗記できてるかも。そんな時短を求める君にオススメのアプリです。 勉強の息抜きにも最適です！
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Price over time on the United States storefront, quoted in USD — from our own daily price tracking. Other markets are listed under "Price by market" in the Prices tab; they are not on this axis, because one line cannot be two currencies.
Showing the last 90 days (the review-based charts: the last 4 monthly points). Full history and CSV export come with a free account.