diff --git a/.gitignore b/.gitignore
index 3a16dbbef6..7fcf843fb0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -132,4 +132,7 @@ gitversion
 eve.db
 
 # vscode settings
-.vscode
\ No newline at end of file
+.vscode
+
+# Local launcher (not for upstream)
+run.ps1
\ No newline at end of file
diff --git a/gui/app.py b/gui/app.py
index ac9ec9ed22..410bd83bbc 100644
--- a/gui/app.py
+++ b/gui/app.py
@@ -4,7 +4,7 @@
 import sys
 from logbook import Logger
 pyfalog = Logger(__name__)
-from service.settings import LocaleSettings
+from service.settings import LocaleSettings, ThemeSettings
 
 
 class PyfaApp(wx.App):
@@ -16,6 +16,9 @@ def OnInit(self):
         # Name for my application.
         self.appName = "pyfa"
 
+        # Windows can only apply appearance before any windows exist.
+        self.ApplyAppearance()
+
         #------------
 
         # # Simplified init method.
@@ -74,4 +77,25 @@ def UpdateLanguage(self, lang=None):
 
         else:
             pyfalog.debug("Cannot find langauge: " + lang)
-            self.locale = wx.Locale(wx.Locale.FindLanguageInfo(LocaleSettings.defaults['locale']).Language)
\ No newline at end of file
+            self.locale = wx.Locale(wx.Locale.FindLanguageInfo(LocaleSettings.defaults['locale']).Language)
+
+    def ApplyAppearance(self):
+        try:
+            appearance_map = {
+                ThemeSettings.SYSTEM: wx.App.Appearance.System,
+                ThemeSettings.LIGHT: wx.App.Appearance.Light,
+                ThemeSettings.DARK: wx.App.Appearance.Dark,
+            }
+        except AttributeError:
+            pyfalog.debug("wx.App.Appearance is not available; skipping theme setup")
+            return
+
+        mode = ThemeSettings.getInstance().get('appearance')
+        target = appearance_map.get(mode, wx.App.Appearance.System)
+        try:
+            result = self.SetAppearance(target)
+            pyfalog.info("Set appearance to {0} (result {1})", mode, result)
+        except (KeyboardInterrupt, SystemExit):
+            raise
+        except Exception as e:
+            pyfalog.warning("Failed to set application appearance: {0}", e)
\ No newline at end of file
diff --git a/gui/builtinPreferenceViews/pyfaDatabasePreferences.py b/gui/builtinPreferenceViews/pyfaDatabasePreferences.py
index 980b0bf655..9bce67d4cc 100644
--- a/gui/builtinPreferenceViews/pyfaDatabasePreferences.py
+++ b/gui/builtinPreferenceViews/pyfaDatabasePreferences.py
@@ -40,7 +40,7 @@ def populatePanel(self, panel):
         mainSizer.Add(self.stSetUserPath, 0, wx.ALL, 5)
         self.inputUserPath = wx.TextCtrl(panel, wx.ID_ANY, config.savePath, wx.DefaultPosition, wx.DefaultSize, 0)
         self.inputUserPath.SetEditable(False)
-        self.inputUserPath.SetBackgroundColour((200, 200, 200))
+        self.inputUserPath.SetBackgroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_BTNFACE))
         mainSizer.Add(self.inputUserPath, 0, wx.ALL | wx.EXPAND, 5)
 
         # Save DB
@@ -50,7 +50,7 @@ def populatePanel(self, panel):
 
         self.inputFitDB = wx.TextCtrl(panel, wx.ID_ANY, config.saveDB, wx.DefaultPosition, wx.DefaultSize, 0)
         self.inputFitDB.SetEditable(False)
-        self.inputFitDB.SetBackgroundColour((200, 200, 200))
+        self.inputFitDB.SetBackgroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_BTNFACE))
         mainSizer.Add(self.inputFitDB, 0, wx.ALL | wx.EXPAND, 5)
 
         # Game Data DB
@@ -60,7 +60,7 @@ def populatePanel(self, panel):
 
         self.inputGameDB = wx.TextCtrl(panel, wx.ID_ANY, config.gameDB, wx.DefaultPosition, wx.DefaultSize, 0)
         self.inputGameDB.SetEditable(False)
-        self.inputGameDB.SetBackgroundColour((200, 200, 200))
+        self.inputGameDB.SetBackgroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_BTNFACE))
         mainSizer.Add(self.inputGameDB, 0, wx.ALL | wx.EXPAND, 5)
 
         self.cbsaveInRoot.SetValue(config.saveInRoot)
diff --git a/gui/builtinPreferenceViews/pyfaGeneralPreferences.py b/gui/builtinPreferenceViews/pyfaGeneralPreferences.py
index 40c17083b2..b92bb0772a 100644
--- a/gui/builtinPreferenceViews/pyfaGeneralPreferences.py
+++ b/gui/builtinPreferenceViews/pyfaGeneralPreferences.py
@@ -6,7 +6,7 @@
 from gui.bitmap_loader import BitmapLoader
 from gui.preferenceView import PreferenceView
 from service.fit import Fit
-from service.settings import SettingsProvider, LocaleSettings
+from service.settings import SettingsProvider, LocaleSettings, ThemeSettings
 import eos.config
 import wx.lib.agw.hyperlink as hl
 
@@ -23,6 +23,7 @@ def populatePanel(self, panel):
         self.openFitsSettings = SettingsProvider.getInstance().getSettings("pyfaPrevOpenFits",
                                                                            {"enabled": False, "pyfaOpenFits": []})
         self.localeSettings = LocaleSettings.getInstance()
+        self.themeSettings = ThemeSettings.getInstance()
         mainSizer = wx.BoxSizer(wx.VERTICAL)
 
         self.stTitle = wx.StaticText(panel, wx.ID_ANY, self.title, wx.DefaultPosition, wx.DefaultSize, 0)
@@ -95,6 +96,17 @@ def langDisplay(langInfo):
                                   wx.DefaultPosition,
                                   wx.DefaultSize, 0), 0, wx.LEFT, 15)
 
+        self.appearanceChoices = [ThemeSettings.SYSTEM, ThemeSettings.LIGHT, ThemeSettings.DARK]
+        self.rbAppearance = wx.RadioBox(panel, -1, _t("Appearance (requires restart)"), wx.DefaultPosition, wx.DefaultSize,
+                                        [_t("System"), _t("Light"), _t("Dark")], 1, wx.RA_SPECIFY_COLS)
+        mainSizer.Add(self.rbAppearance, 0, wx.EXPAND | wx.TOP | wx.RIGHT | wx.BOTTOM, 10)
+        appearance = self.themeSettings.get('appearance')
+        try:
+            self.rbAppearance.SetSelection(self.appearanceChoices.index(appearance))
+        except ValueError:
+            self.rbAppearance.SetSelection(0)
+        self.rbAppearance.Bind(wx.EVT_RADIOBOX, self.OnAppearanceChange)
+
         self.cbGlobalChar = wx.CheckBox(panel, wx.ID_ANY, _t("Use global character"), wx.DefaultPosition, wx.DefaultSize,
                                         0)
         mainSizer.Add(self.cbGlobalChar, 0, wx.ALL | wx.EXPAND, 5)
@@ -281,6 +293,10 @@ def onCBExpMutants(self, event):
         fitID = self.mainFrame.getActiveFit()
         wx.PostEvent(self.mainFrame, GE.FitChanged(fitIDs=(fitID,)))
 
+    def OnAppearanceChange(self, event):
+        self.themeSettings.set('appearance', self.appearanceChoices[event.GetInt()])
+        event.Skip()
+
     def OnAddLabelsChange(self, event):
         self.sFit.serviceFittingOptions["additionsLabels"] = event.GetInt()
         fitID = self.mainFrame.getActiveFit()
diff --git a/gui/builtinPreferenceViews/pyfaLoggingPreferences.py b/gui/builtinPreferenceViews/pyfaLoggingPreferences.py
index a89d788cce..55dff81da1 100644
--- a/gui/builtinPreferenceViews/pyfaLoggingPreferences.py
+++ b/gui/builtinPreferenceViews/pyfaLoggingPreferences.py
@@ -40,7 +40,7 @@ def populatePanel(self, panel):
         mainSizer.Add(self.stLogPath, 0, wx.ALL, 5)
         self.inputLogPath = wx.TextCtrl(panel, wx.ID_ANY, config.logPath, wx.DefaultPosition, wx.DefaultSize, 0)
         self.inputLogPath.SetEditable(False)
-        self.inputLogPath.SetBackgroundColour((200, 200, 200))
+        self.inputLogPath.SetBackgroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_BTNFACE))
         mainSizer.Add(self.inputLogPath, 0, wx.ALL | wx.EXPAND, 5)
 
         import requests
@@ -49,7 +49,7 @@ def populatePanel(self, panel):
         mainSizer.Add(self.certPath, 0, wx.ALL, 5)
         self.certPathCtrl = wx.TextCtrl(panel, wx.ID_ANY, requests.certs.where(), wx.DefaultPosition, wx.DefaultSize, 0)
         self.certPathCtrl.SetEditable(False)
-        self.certPathCtrl.SetBackgroundColour((200, 200, 200))
+        self.certPathCtrl.SetBackgroundColour(wx.SystemSettings.GetColour(wx.SYS_COLOUR_BTNFACE))
         mainSizer.Add(self.certPathCtrl, 0, wx.ALL | wx.EXPAND, 5)
 
         # Debug Logging
diff --git a/gui/builtinShipBrowser/pfBitmapButton.py b/gui/builtinShipBrowser/pfBitmapButton.py
index 647e22debf..a88ff95cc7 100644
--- a/gui/builtinShipBrowser/pfBitmapButton.py
+++ b/gui/builtinShipBrowser/pfBitmapButton.py
@@ -5,7 +5,7 @@
 class PFGenBitmapButton(GenBitmapButton):
     def __init__(self, parent, id, bitmap, pos, size, style):
         GenBitmapButton.__init__(self, parent, id, bitmap, pos, size, style)
-        self.bgcolor = wx.Brush(wx.WHITE)
+        self.bgcolor = wx.Brush(wx.SystemSettings.GetColour(wx.SYS_COLOUR_BTNFACE))
 
     def SetBackgroundColour(self, color):
         self.bgcolor = wx.Brush(color)
diff --git a/gui/utils/dark.py b/gui/utils/dark.py
index 0d2739f30b..ca0ace86ea 100644
--- a/gui/utils/dark.py
+++ b/gui/utils/dark.py
@@ -2,8 +2,6 @@
 
 
 def isDark():
-    if 'wxMSW' in wx.PlatformInfo:
-        return False
     try:
         return wx.SystemSettings.GetAppearance().IsDark()
     except (KeyboardInterrupt, SystemExit):
diff --git a/requirements.txt b/requirements.txt
index 46ed9241b9..cdac806e2f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-wxPython==4.2.1
+wxPython==4.3.0
 logbook==1.7.0.post0
 numpy==1.26.2
 matplotlib==3.8.2
diff --git a/service/settings.py b/service/settings.py
index 9d24469033..b02553aa2c 100644
--- a/service/settings.py
+++ b/service/settings.py
@@ -600,3 +600,36 @@ def set(self, key, value):
         if key == 'locale' and value not in self.supported_languages():
             self.settings[key] = self.DEFAULT
         self.settings[key] = value
+
+
+class ThemeSettings:
+    _instance = None
+
+    SYSTEM = "system"
+    LIGHT = "light"
+    DARK = "dark"
+    VALUES = (SYSTEM, LIGHT, DARK)
+
+    defaults = {
+        'appearance': SYSTEM,
+    }
+
+    def __init__(self):
+        self.settings = SettingsProvider.getInstance().getSettings('pyfaTheme', self.defaults)
+
+    @classmethod
+    def getInstance(cls):
+        if cls._instance is None:
+            cls._instance = ThemeSettings()
+        return cls._instance
+
+    def get(self, key):
+        value = self.settings[key]
+        if key == 'appearance' and value not in self.VALUES:
+            return self.defaults['appearance']
+        return value
+
+    def set(self, key, value):
+        if key == 'appearance' and value not in self.VALUES:
+            value = self.defaults['appearance']
+        self.settings[key] = value