Map Apple modifiers (Ctrl, Option, Command) to Windows modifiers (Ctrl, Win, Alt) in Citrix Workspace using Karabiner Elements, with working Alt+Tab and Windows key shortcuts

citrix_ctrl_alt_win.json

{
    "title": "Citrix Receiver/Workspace modifiers for Ctrl, Alt, Windows order",
    "rules": [
        {
            "description": "In Citrix, add fn modifier to tab so it is forwarded",
            "manipulators": [
                {
                    "from": {
                        "key_code": "tab",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "tab",
                        "modifiers": [ "fn" ]
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }, {
            "description": "In Citrix, change left_option to Alt key via \"⌘⌥ Command (left)-Option\"",
            "manipulators": [
                {
                    "from": {
                        "key_code": "left_option",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "left_option",
                        "modifiers": [ "left_command", "fn" ]
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }, {
            "description": "In Citrix, change right_option to Alt key via \"⌘⌥ Command (left)-Option\"",
            "manipulators": [
                {
                    "from": {
                        "key_code": "right_option",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "right_option",
                        "modifiers": [ "left_command", "fn" ]
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }, {
            "description": "In Citrix, change left_command as well via \"Send Windows logo key using ⌘ Command (right)\"",
            "manipulators": [
                {
                    "from": {
                        "key_code": "left_command",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "right_command"
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }
    ]
}

citrix_ctrl_win_alt.json

{
    "title": "Citrix Receiver/Workspace modifiers for Ctrl, Windows, Alt order",
    "rules": [
        {
            "description": "In Citrix, add fn modifier to tab so it is forwarded",
            "manipulators": [
                {
                    "from": {
                        "key_code": "tab",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "tab",
                        "modifiers": [ "fn" ]
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }, {
            "description": "In Citrix, change left_command to Alt via \"⌘⌥ Command (left)-Option\"",
            "manipulators": [
                {
                    "from": {
                        "key_code": "left_command",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "left_command",
                        "modifiers": [ "left_option" ]
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }, {
            "description": "In Citrix, change right_command to Alt via \"⌘⌥ Command (left)-Option\"",
            "manipulators": [
                {
                    "from": {
                        "key_code": "right_command",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "left_command",
                        "modifiers": [ "left_option" ]
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }, {
            "description": "In Citrix, change left_option to Windows logo key via \"Send Windows logo key using ⌘ Command (right)\"",
            "manipulators": [
                {
                    "from": {
                        "key_code": "left_option",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "right_command"
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }, {
            "description": "In Citrix, change right_option to Windows logo key via \"Send Windows logo key using ⌘ Command (right)\"",
            "manipulators": [
                {
                    "from": {
                        "key_code": "right_option",
                        "modifiers": { "optional": [ "any" ] }
                    },
                    "to": {
                        "key_code": "right_command"
                    },
                    "type": "basic",
                    "conditions": [
                        {
                            "type": "frontmost_application_if",
                            "bundle_identifiers": [
                                "^com\\.citrix\\.XenAppViewer$",
                                "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                            ]
                        }
                    ]
                }
            ]
        }
    ]
}

citrix_home_end.json

{
  "title": "Home/End mapping compatible with Citrix Receiver/Workspace",
  "rules": [
      {
          /* In Citrix, the Windows remote handles this combination natively */
          "description": "Except in Citrix, change Control-Home to navigate to top of document via Command-Up",
          "manipulators": [
              {
                  "conditions": [
                      {
                          "bundle_identifiers": [
                              "^com\\.citrix\\.XenAppViewer$",
                              "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                          ],
                          "type": "frontmost_application_unless"
                      }
                  ],
                  "from": {
                      "key_code": "home",
                      "modifiers": {
                          "mandatory": [
                              "control"
                          ],
                          "optional": [
                              "shift"
                          ]
                      }
                  },
                  "to": [
                      {
                          "key_code": "up_arrow",
                          "modifiers": [
                              "left_command"
                          ]
                      }
                  ],
                  "type": "basic"
              }
          ]
      },
      {
          /* ibid */
          "description": "Except in Citrix, change Control-End to navigate to bottom of document via Command-Down",
          "manipulators": [
              {
                  "conditions": [
                      {
                          "bundle_identifiers": [
                              "^com\\.citrix\\.XenAppViewer$",
                              "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                          ],
                          "type": "frontmost_application_unless"
                      }
                  ],
                  "from": {
                      "key_code": "end",
                      "modifiers": {
                          "mandatory": [
                              "control"
                          ],
                          "optional": [
                              "shift"
                          ]
                      }
                  },
                  "to": [
                      {
                          "key_code": "down_arrow",
                          "modifiers": [
                              "left_command"
                          ]
                      }
                  ],
                  "type": "basic"
              }
          ]
      },
      {
          /* Fn-Left/Right maps to Home/End in Citrix, making it a better choice than Command-Left/Right for Citrix users.

             MacOS supports Home/End functionality in two ways:
               * Command-Left/Right: Maps to Control-Left/Right in Citrix (useless), behaves as expected in MacOS
               * Fn-Left/Right: Maps to Home/End correctly in Citrix, behaves as expected in MacOS

             Reference: https://www.cnet.com/how-to/two-mac-keyboard-shortcuts-for-missing-home-and-end-keys/
           */
          "description": "Change Home to navigate to start of line via Fn-Left (Fn-Left maps to Home in Citrix)",
          "manipulators": [
              {
                  "from": {
                      "key_code": "home",
                      "modifiers": {
                          "optional": [
                              "any"
                          ]
                      }
                  },
                  "to": [
                      {
                          "key_code": "left_arrow",
                          "modifiers": [
                              "fn"
                          ]
                      }
                  ],
                  "type": "basic"
              }
          ]
      },
      {
          /* ibid */
          "description": "Change End to navigate to end of line via Fn-Right (Fn-Right maps to End in Citrix)",
          "manipulators": [
              {
                  "from": {
                      "key_code": "end",
                      "modifiers": {
                          "optional": [
                              "any"
                          ]
                      }
                  },
                  "to": [
                      {
                          "key_code": "right_arrow",
                          "modifiers": [
                              "fn"
                          ]
                      }
                  ],
                  "type": "basic"
              }
          ]
      }
  ]
}

citrix_print_screen.json

{
  /* Based on https://gist.github.com/permil/ed5a66f7e0cb712b0a9c03532530b9dd */
  "title": "Print Screen mapping compatible with Citrix Receiver/Workspace",
  "rules": [
      {
        "description": "Except in Citrix, change print_screen to capture entire screen via Command-Shift-3",
        "manipulators": [
            {
                "conditions": [
                    {
                        "bundle_identifiers": [
                            "^com\\.citrix\\.XenAppViewer$",
                            "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                        ],
                        "type": "frontmost_application_unless"
                    }
                ],
                "from": {
                    "key_code": "print_screen"
                },
                "to": [
                    {
                        "key_code": "3",
                        "modifiers": [
                            "left_command",
                            "left_shift"
                        ]
                    }
                ],
                "type": "basic"
            }
        ]
    },
    {
        "description": "Except in Citrix, change print_screen to capture current window via Command-Shift-4",
        "manipulators": [
            {
                "conditions": [
                    {
                        "bundle_identifiers": [
                            "^com\\.citrix\\.XenAppViewer$",
                            "^com\\.citrix\\.receiver\\.icaviewer\\.mac$"
                        ],
                        "type": "frontmost_application_unless"
                    }
                ],
                "from": {
                    "key_code": "print_screen",
                    "modifiers": {
                        "mandatory": [
                            "option"
                        ]
                    }
                },
                "parameters": {
                    "basic.to_delayed_action_delay_milliseconds": 50
                },
                "to": [
                    {
                        "key_code": "4",
                        "modifiers": [
                            "left_command",
                            "left_shift"
                        ]
                    }
                ],
                "to_delayed_action": {
                    "to_if_invoked": [
                        {
                            "key_code": "spacebar"
                        }
                    ]
                },
                "type": "basic"
            }
        ]
    }
  ]
}

Can't you just use Cmd+Tab to alt-tab out of the full screen Citrix window and Option+Tab as "Alt+Tab" within Citrix? That's how I roll

Yeah, I have it setup to work that way too and it's nice. For whatever reason I still just keep it as a maximised window, I like having the Mac top toolbar visible. Also respect for responding to the year old query of the other guy ;)

If OP sees this then again, chef's kiss, I daily your config for work purposes.

Thank you so much for sharing this. Straightforward instructions and worked first time! Looking forward to using my Mac for my day job now! :D

What key combination gets a '#' please?

I've been able to workaround the above by disabling the rules for the right hand side of the keyboard and using opt + 3 as normal.

I am struggling to get the equivalent of hodling ALT and selecting text to select a rectangular block. Using my mapped to alt opt key results in a right click most of the time (I have seen it do a block select twice and I can't figure out why). Any ideas?

Is there any way to restrict these key maps to Citrix? I am also seeing these changes throughout MacOS.

@den3erw Yes you can limit this to just Citrix. In the scripts you will see the following:

"conditions": [
{
"type": "frontmost_application_if",
"bundle_identifiers": [
"^com\.citrix\.XenAppViewer$",
"^com\.citrix\.receiver\.icaviewer\.mac$"
]
}
]