Studyplus(スタディプラス)勉強記録&集中タイマー is an education app by Studyplus Inc with 1,000,000+ downloads (about 2.7M estimated). +5.8K installs in the last 7 days. Rated 4.8 from 38K ratings. Released Apr 15, 2013. Install growth, rank history, SDKs and ad networks.
From the store listing: “◆A study tracking app used by over 10 million people◆
◆Measure and record your study time with a stopwatch and timer, and block out the temptation of your smartphone with a focus mode◆
◆For middle school students to working adults. For studying towards your goals, whether it's university entrance exams, regular tests,…”