This is an application that displays information on J-Cluster, an amateur radio web cluster used exclusively in Japan for amateur radio. * function - Cluster information display: Displays J-Cluster information. ・Selective display: Displays spots by all modes, CW, Phone, Digital, and commemorative stations. ・Custom display: Displays up to 3 types of arbitrary modes and band spots. ・Details display: Tap a spot to display the details of the spot. - Coloring of commemorative stations: Colors the call signs of special commemorative stations and commemorative stations (prefixes 8J, 8N, 8M). - JARL station coloring: Add color to the call signs of JARL stations (JA?RL, JA?YRL, JA1YAA, JA1TOKYO). ・Year, month, and day display: Displays the year, month, and day in spot information. ・Write: Write spot information. - Specify the number of latest data: You can select the number of latest data. ・Es latest information display: Displays the latest information of NICT's fxEs at the top of the spot information. ・Es display: Displays NICT's Es information and ionogram information. ・DXSCAPE display: Displays DXSCAPE information. * Limitations - Selection display selects and displays the applicable mode from up to 1000 data. * App permission information This app requires the following permissions. ・Network communication: J-Cluster website (http://qrv.jp/), DXSCAPE website (http://www.dxscape.com/) Access and get cluster information, NICT website (NICT website (https://wdc.nict.go.jp/Ionosphere/realtime/) and (https://wdc.nict.go.jp/Ionosphere/realtime/fxEs/latest-fxEs.html) Access and get Es information.