diff --git a/boot.py b/boot.py
index 4cfb2c029..09691f6af 100644
--- a/boot.py
+++ b/boot.py
@@ -24,6 +24,7 @@
 from .plugin.core.panels import LspUpdateLogPanelCommand
 from .plugin.core.panels import WindowPanelListener
 from .plugin.core.protocol import Error
+from .plugin.color_picker import CloseColorPickerOnBlur
 from .plugin.core.protocol import Location
 from .plugin.core.protocol import LocationLink
 from .plugin.core.registry import LspRecheckSessionsCommand
@@ -39,6 +40,7 @@
 from .plugin.core.transports import kill_all_subprocesses
 from .plugin.core.typing import Any, Optional, List, Type, Dict, Union
 from .plugin.core.views import get_uri_and_position_from_location
+from .plugin.color_picker import LspChooseColorPicker
 from .plugin.core.views import LspRunTextCommandHelperCommand
 from .plugin.document_link import LspOpenLinkCommand
 from .plugin.documents import DocumentSyncListener
diff --git a/plugin/color_picker/__init__.py b/plugin/color_picker/__init__.py
new file mode 100644
index 000000000..a5028909c
--- /dev/null
+++ b/plugin/color_picker/__init__.py
@@ -0,0 +1,242 @@
+from ..core.protocol import Color, TextEdit, ColorInformation
+from ..core.typing import Callable, Optional, List, Any
+from ..core.views import lsp_color_to_hex
+from ..formatting import apply_text_edits_to_view
+from abc import ABCMeta
+import os
+import sublime
+import sublime_plugin
+import subprocess
+import sys
+import threading
+
+OnPickCallback = Callable[[Optional[Color]], None]
+
+
+class ColorPickerPlugin(metaclass=ABCMeta):
+    def pick(self, on_pick: OnPickCallback, preselect_color: Optional[Color] = None) -> None:
+        ...
+
+    def normalize_color(self, color: Any) -> Optional[Color]:
+        ...
+
+    def close(self) -> None:
+        ...
+
+
+if sublime.platform() == 'linux':
+    class LinuxColorPicker(ColorPickerPlugin):
+        process = None  # type: Optional[subprocess.Popen]
+
+        def pick(self, on_pick: OnPickCallback, preselect_color: Optional[Color] = None) -> None:
+            self.close()
+            t = threading.Thread(target=self._open_picker, args=(on_pick, preselect_color))
+            t.start()
+
+        def _open_picker(self, on_pick: OnPickCallback, color: Optional[Color] = None) -> None:
+            preselect_color_arg = ""
+            if color:
+                preselect_color_arg = "{},{},{},{}".format(
+                    color['red'], color['green'], color['blue'], color['alpha']
+                )
+            picker_cmd = [
+                os.path.join(sublime.packages_path(), "LSP", "plugin", "color_picker", "linux_executable.py"),
+                preselect_color_arg
+            ]
+            self.process = subprocess.Popen(picker_cmd, stdout=subprocess.PIPE)
+            output = self.process.communicate()[0].strip().decode('utf-8')
+            on_pick(self.normalize_color(output))
+
+        def normalize_color(self, color: Any) -> Optional[Color]:
+            if color and isinstance(color, str):
+                r, g, b, a = map(float, color.split(','))
+                return {
+                    "red": r,
+                    "green": g,
+                    "blue": b,
+                    "alpha": a,
+                }
+            return None
+
+        def close(self) -> None:
+            if self.process:
+                try:
+                    self.process.kill()
+                except:
+                    pass
+            self.process = None
+
+
+if sys.platform == "win32":
+    import ctypes
+
+    class CHOOSECOLOR(ctypes.Structure):
+        _fields_ = [
+            ("lStructSize", ctypes.c_uint32),
+            ("hwndOwner", ctypes.c_void_p),
+            ("hInstance", ctypes.c_void_p),
+            ("rgbResult", ctypes.c_uint32),
+            ("lpCustColors", ctypes.POINTER(ctypes.c_uint32)),
+            ("Flags", ctypes.c_uint32),
+            ("lCustData", ctypes.c_void_p),
+            ("lpfnHook", ctypes.c_void_p),
+            ("lpTemplateName", ctypes.c_wchar_p)]
+
+    CC_SOLIDCOLOR = 0x80
+    CC_RGBINIT = 0x01
+    CC_FULLOPEN = 0x02
+    ChooseColorW = ctypes.windll.Comdlg32.ChooseColorW
+    ChooseColorW.argtypes = [ctypes.POINTER(CHOOSECOLOR)]
+    ChooseColorW.restype = ctypes.c_int32
+
+
+    class WindowsColorPicker(ColorPickerPlugin):
+        def pick(self, on_pick: OnPickCallback, preselect_color: Optional[Color] = None) -> None:
+            self.close()
+            default_color = (255 << 16) | (255 << 8) | (255)
+            if preselect_color:
+                default_color = (round(255*preselect_color['blue']) << 16) | (round(255*preselect_color['green']) << 8) | round(255*preselect_color['red'])
+            cc = CHOOSECOLOR()
+            ctypes.memset(ctypes.byref(cc), 0, ctypes.sizeof(cc))
+            cc.lStructSize = ctypes.sizeof(cc)
+            cc.hwndOwner = sublime.active_window().hwnd()
+            CustomColors = ctypes.c_uint32 * 16
+            cc.lpCustColors = CustomColors() # uses 0 (black) for all 16 predefined custom colors
+            cc.rgbResult = ctypes.c_uint32(default_color)
+            cc.Flags = CC_SOLIDCOLOR | CC_FULLOPEN | CC_RGBINIT
+
+            # ST window will become unresponsive until color picker dialog is closed
+            output = ChooseColorW(ctypes.byref(cc))
+
+            if output == 1: # user clicked OK
+                on_pick(self.normalize_color(cc.rgbResult))
+            else:
+                on_pick(None)
+
+        def normalize_color(self, bgr_color: Any) -> Optional[Color]:
+
+            def bgr2color(bgr) -> Color:
+                # 0x00BBGGRR
+                byte_table = list(["{0:02X}".format(b) for b in range(256)])
+                b_hex = byte_table[(bgr >> 16) & 0xff]
+                g_hex = byte_table[(bgr >> 8) & 0xff]
+                r_hex = byte_table[(bgr) & 0xff]
+
+                r = int(r_hex, 16) / 255
+                g = int(g_hex, 16) / 255
+                b = int(b_hex, 16) / 255
+                return {
+                    "red": r,
+                    "green": g,
+                    "blue": b,
+                    "alpha": 1  # Windows color picker doesn't support alpha, so fallback to 1
+                }
+
+            if bgr_color:
+                return bgr2color(bgr_color)
+            return None
+
+        def close(self) -> None:
+            pass # on windows, the color picker will block until a color is choosen 
+
+
+if sublime.platform() == 'osx':
+    class OsxColorPicker(ColorPickerPlugin):
+        process = None  # type: Optional[subprocess.Popen]
+        script = '''
+        function run(argv) {{
+            var app = Application.currentApplication();
+            app.includeStandardAdditions = true;
+            var color = app.chooseColor({{defaultColor: [{red}, {green}, {blue}]}});
+            console.log(JSON.stringify(color));
+        }}
+        '''
+
+        def pick(self, on_pick: OnPickCallback, preselect_color: Optional[Color] = None) -> None:
+            self.close()
+            t = threading.Thread(target=self._open_picker, args=(on_pick, preselect_color))
+            t.start()
+
+        def _open_picker(self, on_pick: OnPickCallback, color: Optional[Color] = None) -> None:
+            script = self.script.format(red=0, green=0, blue=0)
+            if color:
+                script = self.script.format(red=color['red'], green=color['green'], blue=color['blue'])
+            picker_cmd = ["/usr/bin/osascript", "-l", "JavaScript", "-e", script]
+            self.process = subprocess.Popen(picker_cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+            output = self.process.communicate()[0].strip().decode('ascii')
+            on_pick(self.normalize_color(output))
+
+        def normalize_color(self, color: Any) -> Optional[Color]:
+            print('OSX output contains a warning:', color)
+            if color and isinstance(color, list):
+                r, g, b = 1, 1, 1 # hardcoded
+                return {
+                    "red": r,
+                    "green": g,
+                    "blue": b,
+                    "alpha": 1, # OSX color picker doesn't support alpha, so fallback to 1
+                }
+            return None
+
+        def close(self) -> None:
+            if self.process:
+                try:
+                    self.process.kill()
+                except:
+                    pass
+            self.process = None
+
+
+def get_color_picker() -> Optional[ColorPickerPlugin]:
+    if sublime.platform() == "linux":
+        return LinuxColorPicker()
+    if sublime.platform() == "windows":
+        return WindowsColorPicker()
+    if sublime.platform() == "osx":
+        return OsxColorPicker()
+    return None
+
+
+color_picker = get_color_picker()
+
+
+class CloseColorPickerOnBlur(sublime_plugin.EventListener):
+    def on_activated(self, view: sublime.View) -> None:
+        if color_picker:
+            color_picker.close()
+
+    def on_exit(self) -> None:
+        if color_picker:
+            color_picker.close()
+
+
+class LspChooseColorPicker(sublime_plugin.TextCommand):
+    def run(self, edit: sublime.Edit, color_information: ColorInformation, file_name: str) -> None:
+        if not color_picker:
+            sublime.status_message('Your platform does not support a ColorPicker yet.')
+            return
+        window = self.view.window()
+        if not window:
+            return
+
+        def on_select(color: Optional[Color]) -> None:
+            self.on_pick_color(color, color_information, file_name)
+
+        color_picker.pick(on_select, color_information['color'])
+
+    def on_pick_color(
+        self, selected_color: Optional[Color], color_information: ColorInformation, file_name: str
+    ) -> None:
+        if not selected_color:
+            return
+        window = self.view.window()
+        if not window:
+            return
+        view = window.find_open_file(file_name)
+        new_text = lsp_color_to_hex(selected_color)
+        text_edits = [{
+            "newText": new_text,
+            "range": color_information['range']
+        }]  # type: List[TextEdit]
+        if view:
+            apply_text_edits_to_view(text_edits, view)
diff --git a/plugin/color_picker/linux_executable.py b/plugin/color_picker/linux_executable.py
new file mode 100755
index 000000000..4d863b3e8
--- /dev/null
+++ b/plugin/color_picker/linux_executable.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+import gi
+import sys
+gi.require_version('Gtk', '3.0')
+from gi.repository import Gtk
+from gi.repository import Gdk
+
+color_chooser_dialog = Gtk.ColorChooserDialog(show_editor=True)
+color_chooser_dialog.set_title('LSP Color Picker')
+
+if len(sys.argv) > 1: # sys.argv[1] looks like '1,0.2,1,0.5'
+    r, g, b, a = map(float, sys.argv[1].split(','))
+    preselect_color = Gdk.RGBA(r, g, b, a)
+    color_chooser_dialog.set_rgba(preselect_color)
+
+def on_select_color():
+    color = color_chooser_dialog.get_rgba()
+    print('{},{},{},{}'.format(color.red, color.green, color.blue, color.alpha))
+
+if color_chooser_dialog.run() == Gtk.ResponseType.OK:
+    on_select_color()
+
+color_chooser_dialog.destroy()
diff --git a/plugin/core/protocol.py b/plugin/core/protocol.py
index a21880987..a8e7a0100 100644
--- a/plugin/core/protocol.py
+++ b/plugin/core/protocol.py
@@ -166,6 +166,18 @@ class SemanticTokenModifiers:
     'end': Position
 })
 
+Color = TypedDict('Color', {
+    'red': float,
+    'green': float,
+    'blue': float,
+    'alpha': float
+}, total=True)
+
+ColorInformation = TypedDict('ColorInformation', {
+    'range': RangeLsp,
+    'color': Color
+}, total=True)
+
 TextDocumentIdentifier = TypedDict('TextDocumentIdentifier', {
     'uri': DocumentUri,
 }, total=True)
diff --git a/plugin/core/views.py b/plugin/core/views.py
index 79d83853b..999e950e5 100644
--- a/plugin/core/views.py
+++ b/plugin/core/views.py
@@ -1,8 +1,8 @@
 from .css import css as lsp_css
-from .protocol import CodeAction
 from .protocol import CodeActionContext
 from .protocol import CodeActionParams
 from .protocol import CodeActionTriggerKind
+from .protocol import CodeAction, Color, ColorInformation
 from .protocol import Command
 from .protocol import CompletionItem
 from .protocol import CompletionItemKind
@@ -763,28 +763,46 @@ def run(self, view_id: int, command: str, args: Optional[Dict[str, Any]] = None)
 
 
 COLOR_BOX_HTML = """
-<style>html {{padding: 0; background-color: transparent}}</style>
+<style>
+    html {{padding: 0; background-color: transparent}}
+
+    #lsp-color-box a {{
+        border: 1px solid color(var(--foreground) alpha(0.25));
+        background-color: {backgroundColor};
+        margin-top: 0.1em;
+        height: 1rem;
+        width: 1rem;
+        display: block;
+    }}
+</style>
 <body id='lsp-color-box'>
-<div style='padding: 0.4em;
-            margin-top: 0.2em;
-            border: 1px solid color(var(--foreground) alpha(0.25));
-            background-color: rgba({}, {}, {}, {})'>
-</div>
+    <a href="{command}">&nbsp;</a>
 </body>"""
 
 
-def lsp_color_to_html(color_info: Dict[str, Any]) -> str:
-    color = color_info['color']
-    red = color['red'] * 255
-    green = color['green'] * 255
-    blue = color['blue'] * 255
-    alpha = color['alpha']
-    return COLOR_BOX_HTML.format(red, green, blue, alpha)
+def lsp_color_to_hex(color: Color) -> str:
+    red = int(color['red'] * 255)
+    green = int(color['green'] * 255)
+    blue = int(color['blue'] * 255)
+    alpha = int(color['alpha'] * 255)
 
+    if color['alpha'] < 1:
+        return "#{:02x}{:02x}{:02x}{:02x}".format(red, green, blue, alpha)
+    return "#{:02x}{:02x}{:02x}".format(red, green, blue)
 
-def lsp_color_to_phantom(view: sublime.View, color_info: Dict[str, Any]) -> sublime.Phantom:
-    region = range_to_region(Range.from_lsp(color_info['range']), view)
-    return sublime.Phantom(region, lsp_color_to_html(color_info), sublime.LAYOUT_INLINE)
+
+def lsp_color_to_html(view: sublime.View, color_information: ColorInformation) -> str:
+    color = lsp_color_to_hex(color_information['color'])
+    command = sublime.command_url('lsp_choose_color_picker', {
+        'color_information': color_information,
+        'file_name': view.file_name()
+    })
+    return COLOR_BOX_HTML.format(command=command, backgroundColor=color)
+
+
+def lsp_color_to_phantom(view: sublime.View, color_information: ColorInformation) -> sublime.Phantom:
+    region = range_to_region(Range.from_lsp(color_information['range']), view)
+    return sublime.Phantom(region, lsp_color_to_html(view, color_information), sublime.LAYOUT_INLINE)
 
 
 def document_color_params(view: sublime.View) -> Dict[str, Any]:
diff --git a/plugin/session_buffer.py b/plugin/session_buffer.py
index faad70479..c9a329f00 100644
--- a/plugin/session_buffer.py
+++ b/plugin/session_buffer.py
@@ -1,3 +1,4 @@
+from .core.protocol import ColorInformation
 from .core.protocol import Diagnostic
 from .core.protocol import DiagnosticSeverity
 from .core.protocol import DocumentLink
@@ -351,10 +352,9 @@ def _do_color_boxes_async(self, view: sublime.View, version: int) -> None:
                 Request.documentColor(document_color_params(view), view),
                 self._if_view_unchanged(self._on_color_boxes_async, version)
             )
-
-    def _on_color_boxes_async(self, view: sublime.View, response: Any) -> None:
+    def _on_color_boxes_async(self, view: sublime.View, response: List[ColorInformation]) -> None:
         color_infos = response if response else []
-        self.color_phantoms.update([lsp_color_to_phantom(view, color_info) for color_info in color_infos])
+        self.color_phantoms.update([lsp_color_to_phantom(view, color_information) for color_information in color_infos])
 
     # --- textDocument/documentLink ------------------------------------------------------------------------------------