Only the current version so far — new entries appear as the app ships updates.
カチリ|カチッと合わせる集中タイマー is a tools app by MOBILE TENT K.K. with 5+ downloads (about 7 estimated). +2 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “A study timer compatible with the Pomodoro Method. Simply click to focus, and it automatically takes a break when finished. In study rooms, it uses vibration and light to notify you silently. Includes customizable skins to suit your mood.”