github.com/sagernet/sing-box@v1.2.7/docs/installation/clients/sfa.md (about)

     1  # SFA
     2  
     3  Experimental Android client for sing-box.
     4  
     5  #### Requirements
     6  
     7  * Android 5.0+
     8  
     9  #### Download
    10  
    11  * [AppCenter](https://install.appcenter.ms/users/nekohasekai/apps/sfa/distribution_groups/publictest)
    12  
    13  #### Note
    14  
    15  * User Agent in remote profile request is `SFA/$version ($version_code; sing-box $sing_box_version)`
    16  * The working directory is located at `/sdcard/Android/data/io.nekohasekai.sfa/files` (External files directory)
    17  * Crash logs is located in `$working_directory/stderr.log`