diff --git a/gui/src/components/OnnxWeb.tsx b/gui/src/components/OnnxWeb.tsx
index 6eee4329..8fec1da6 100644
--- a/gui/src/components/OnnxWeb.tsx
+++ b/gui/src/components/OnnxWeb.tsx
@@ -1,9 +1,13 @@
-import { doesExist } from '@apextoaster/js-utils';
+import { mustExist } from '@apextoaster/js-utils';
 import { TabContext, TabList, TabPanel } from '@mui/lab';
-import { Box, Container, Divider, Tab } from '@mui/material';
+import { Box, Container, Divider, PaletteMode, Tab, useMediaQuery, CssBaseline } from '@mui/material';
+import { createTheme, ThemeProvider } from '@mui/material/styles';
 import * as React from 'react';
+import { useContext, useMemo } from 'react';
 import { useHash } from 'react-use/lib/useHash';
+import { useStore } from 'zustand';
 
+import { StateContext } from '../state.js';
 import { ModelControl } from './control/ModelControl.js';
 import { ImageHistory } from './ImageHistory.js';
 import { Logo } from './Logo.js';
@@ -13,50 +17,68 @@ import { Inpaint } from './tab/Inpaint.js';
 import { Settings } from './tab/Settings.js';
 import { Txt2Img } from './tab/Txt2Img.js';
 import { Upscale } from './tab/Upscale.js';
-import { getTab, TAB_LABELS } from './utils.js';
+import { getTheme, getTab, TAB_LABELS } from './utils.js';
 
 export function OnnxWeb() {
+  /* checks for system light/dark mode preference */
+  const prefersDarkMode = useMediaQuery('(prefers-color-scheme: dark)');
+  const state = useStore(mustExist(useContext(StateContext)));
+
+  const theme = useMemo(
+    () => createTheme({
+      palette: {
+        mode: getTheme(state.theme, prefersDarkMode) as PaletteMode
+      }
+    }),
+    [prefersDarkMode, state.theme],
+  );
+
   const [hash, setHash] = useHash();
 
   return (
-    <Container>
-      <Box sx={{ my: 4 }}>
-        <Logo />
-      </Box>
-      <Box sx={{ mx: 4, my: 4 }}>
-        <ModelControl />
-      </Box>
-      <TabContext value={getTab(hash)}>
-        <Box sx={{ borderBottom: 1, borderColor: 'divider' }}>
-          <TabList onChange={(_e, idx) => {
-            setHash(idx);
-          }}>
-            {TAB_LABELS.map((name) => <Tab key={name} label={name} value={name} />)}
-          </TabList>
+    <ThemeProvider theme={theme}>
+      <CssBaseline />
+      <Container>
+        <Box sx={{ my: 4 }}>
+          <Logo />
         </Box>
-        <TabPanel value='txt2img'>
-          <Txt2Img />
-        </TabPanel>
-        <TabPanel value='img2img'>
-          <Img2Img />
-        </TabPanel>
-        <TabPanel value='inpaint'>
-          <Inpaint />
-        </TabPanel>
-        <TabPanel value='upscale'>
-          <Upscale />
-        </TabPanel>
-        <TabPanel value='blend'>
-          <Blend />
-        </TabPanel>
-        <TabPanel value='settings'>
-          <Settings />
-        </TabPanel>
-      </TabContext>
-      <Divider variant='middle' />
-      <Box sx={{ mx: 4, my: 4 }}>
-        <ImageHistory />
-      </Box>
-    </Container>
+        <Box sx={{ mx: 4, my: 4 }}>
+          <ModelControl />
+        </Box>
+
+        <TabContext value={getTab(hash)}>
+          <Box sx={{ borderBottom: 1, borderColor: 'divider' }}>
+            <TabList onChange={(_e, idx) => {
+              setHash(idx);
+            }}>
+              {TAB_LABELS.map((name) => <Tab key={name} label={name} value={name} />)}
+            </TabList>
+            <TabPanel value='txt2img'>
+              <Txt2Img />
+            </TabPanel>
+            <TabPanel value='img2img'>
+              <Img2Img />
+            </TabPanel>
+            <TabPanel value='inpaint'>
+              <Inpaint />
+            </TabPanel>
+            <TabPanel value='upscale'>
+              <Upscale />
+            </TabPanel>
+            <TabPanel value='blend'>
+              <Blend />
+            </TabPanel>
+            <TabPanel value='settings'>
+              <Settings />
+            </TabPanel>
+          </Box>
+        </TabContext>
+
+        <Divider variant='middle' />
+        <Box sx={{ mx: 4, my: 4 }}>
+          <ImageHistory />
+        </Box>
+      </Container>
+    </ThemeProvider>
   );
 }
diff --git a/gui/src/components/tab/Settings.tsx b/gui/src/components/tab/Settings.tsx
index 030a8880..5f09c1a2 100644
--- a/gui/src/components/tab/Settings.tsx
+++ b/gui/src/components/tab/Settings.tsx
@@ -1,6 +1,6 @@
 import { doesExist, mustExist } from '@apextoaster/js-utils';
 import { Refresh } from '@mui/icons-material';
-import { Alert, Button, Stack, TextField } from '@mui/material';
+import { Alert, Button, FormControlLabel, Stack, Switch, TextField, useMediaQuery } from '@mui/material';
 import * as React from 'react';
 import { useContext, useState } from 'react';
 import { useTranslation } from 'react-i18next';
@@ -8,6 +8,7 @@ import { useStore } from 'zustand';
 
 import { getApiRoot } from '../../config.js';
 import { ConfigContext, StateContext, STATE_KEY } from '../../state.js';
+import { getTheme } from '../utils.js';
 import { NumericField } from '../input/NumericField.js';
 
 function removeBlobs(key: string, value: unknown): unknown {
@@ -28,8 +29,10 @@ function removeBlobs(key: string, value: unknown): unknown {
 }
 
 export function Settings() {
+  const prefersDarkMode = useMediaQuery('(prefers-color-scheme: dark)');
   const config = mustExist(useContext(ConfigContext));
   const state = useStore(mustExist(useContext(StateContext)));
+  const theme = getTheme(state.theme, prefersDarkMode);
 
   const [json, setJson] = useState(JSON.stringify(state, removeBlobs));
   const [root, setRoot] = useState(getApiRoot(config));
@@ -80,6 +83,17 @@ export function Settings() {
         {t('setting.loadState')}
       </Button>
     </Stack>
+    <FormControlLabel control={
+      <Switch checked={theme === 'dark'}
+        onClick={() => {
+          if (theme === 'light') {
+            state.setTheme('dark');
+          } else {
+            state.setTheme('light');
+          }
+        }}
+      />
+    } label={t('setting.darkMode')} />
     <Stack direction='row' spacing={2}>
       <Button onClick={() => state.resetTxt2Img()} color='warning'>{t('setting.reset.txt2img')}</Button>
       <Button onClick={() => state.resetImg2Img()} color='warning'>{t('setting.reset.img2img')}</Button>
diff --git a/gui/src/components/utils.ts b/gui/src/components/utils.ts
index db59ffbd..2dc64cd1 100644
--- a/gui/src/components/utils.ts
+++ b/gui/src/components/utils.ts
@@ -17,3 +17,13 @@ export function getTab(hash: string): string {
 
   return TAB_LABELS[0];
 }
+
+export function getTheme(currentTheme: string, preferDark: boolean): string {
+  if (currentTheme === '') {
+    if (preferDark) {
+      return 'dark';
+    }
+    return 'light';
+  }
+  return currentTheme;
+}
diff --git a/gui/src/state.ts b/gui/src/state.ts
index 73123454..07184332 100644
--- a/gui/src/state.ts
+++ b/gui/src/state.ts
@@ -43,8 +43,10 @@ interface BrushSlice {
 
 interface DefaultSlice {
   defaults: TabState<BaseImgParams>;
+  theme: string;
 
   setDefaults(param: Partial<BaseImgParams>): void;
+  setTheme(theme: string): void;
 }
 
 interface HistorySlice {
@@ -490,6 +492,7 @@ export function createStateSlices(server: ServerParams) {
     defaults: {
       ...base,
     },
+    theme: '',
     setDefaults(params) {
       set((prev) => ({
         defaults: {
@@ -498,6 +501,11 @@ export function createStateSlices(server: ServerParams) {
         }
       }));
     },
+    setTheme(theme) {
+      set((prev) => ({
+        theme,
+      }));
+    }
   });
 
   const createModelSlice: Slice<ModelSlice> = (set) => ({
diff --git a/gui/src/strings/de.ts b/gui/src/strings/de.ts
index 6b8a0fcd..92b8b138 100644
--- a/gui/src/strings/de.ts
+++ b/gui/src/strings/de.ts
@@ -164,6 +164,7 @@ export const I18N_STRINGS_DE = {
         scheduler: 'Standardplaner',
         server: 'API-Server',
         state: 'Kundenstatus',
+        darkMode: 'Dunkelmodus',
       },
       sourceFilter: {
         none: '',
diff --git a/gui/src/strings/en.ts b/gui/src/strings/en.ts
index a7f9a644..ee382f78 100644
--- a/gui/src/strings/en.ts
+++ b/gui/src/strings/en.ts
@@ -226,6 +226,7 @@ export const I18N_STRINGS_EN = {
         scheduler: 'Default Scheduler',
         server: 'API Server',
         state: 'Client State',
+        darkMode: 'Dark Mode',
       },
       scheduler: {
         'ddim': 'DDIM',
diff --git a/gui/src/strings/es.ts b/gui/src/strings/es.ts
index 1bc0de07..e46fc0a8 100644
--- a/gui/src/strings/es.ts
+++ b/gui/src/strings/es.ts
@@ -164,6 +164,7 @@ export const I18N_STRINGS_ES = {
         scheduler: 'Programador predeterminado',
         server: 'Servidor API',
         state: 'Estado del cliente',
+        darkMode: 'Modo Oscuro',
       },
       sourceFilter: {
         none: '',
diff --git a/gui/src/strings/fr.ts b/gui/src/strings/fr.ts
index 3d983f0a..1c6a7e80 100644
--- a/gui/src/strings/fr.ts
+++ b/gui/src/strings/fr.ts
@@ -164,6 +164,7 @@ export const I18N_STRINGS_FR = {
         scheduler: '',
         server: '',
         state: '',
+        darkMode: 'Mode Sombre',
       },
       sourceFilter: {
         none: '',