diff --git a/src/core/theme.rs b/src/core/theme.rs
index 6d30d84..3fee5b1 100644
--- a/src/core/theme.rs
+++ b/src/core/theme.rs
@@ -1,11 +1,18 @@
+use dark_light;
 use iced::{color, Color};
 
 #[derive(Default, Debug, PartialEq, Eq, Copy, Clone)]
+/// Color scheme
 pub enum Theme {
     #[default]
+    /// `Dark`-ish and purple
     Lupin,
+    /// white on black
     Dark,
+    /// black on white
     Light,
+    /// `Dark` or `Light`, according to `dark_light`
+    Auto,
 }
 
 #[derive(Debug, Clone, Copy)]
@@ -39,62 +46,73 @@ pub struct ColorPalette {
 }
 
 impl Theme {
-    pub const ALL: [Self; 3] = [Self::Lupin, Self::Dark, Self::Light];
+    pub const ALL: [Self; 4] = [Self::Lupin, Self::Dark, Self::Light, Self::Auto];
+
     pub fn palette(self) -> ColorPalette {
+        const DARK: ColorPalette = ColorPalette {
+            base: BaseColors {
+                background: color!(0x111111),
+                foreground: color!(0x1C1C1C),
+            },
+            normal: NormalColors {
+                primary: color!(0x5E4266),
+                secondary: color!(0x386e50),
+                surface: color!(0x828282),
+                error: color!(0x992B2B),
+            },
+            bright: BrightColors {
+                primary: color!(0xBA84FC),
+                secondary: color!(0x49eb7a),
+                surface: color!(0xE0E0E0),
+                error: color!(0xC13047),
+            },
+        };
+        const LIGHT: ColorPalette = ColorPalette {
+            base: BaseColors {
+                background: color!(0xEEEEEE),
+                foreground: color!(0xE0E0E0),
+            },
+            normal: NormalColors {
+                primary: color!(0x818181),
+                secondary: color!(0xF9D659),
+                surface: color!(0x818181),
+                error: color!(0x992B2B),
+            },
+            bright: BrightColors {
+                primary: color!(0x673AB7),
+                secondary: color!(0x3797A4),
+                surface: color!(0x000000),
+                error: color!(0xC13047),
+            },
+        };
+        const LUPIN: ColorPalette = ColorPalette {
+            base: BaseColors {
+                background: color!(0x282a36),
+                foreground: color!(0x353746),
+            },
+            normal: NormalColors {
+                primary: color!(0x58406F),
+                secondary: color!(0x386e50),
+                surface: color!(0xa2a4a3),
+                error: color!(0xA13034),
+            },
+            bright: BrightColors {
+                primary: color!(0xbd94f9),
+                secondary: color!(0x49eb7a),
+                surface: color!(0xf4f8f3),
+                error: color!(0xE63E6D),
+            },
+        };
         match self {
-            Self::Dark => ColorPalette {
-                base: BaseColors {
-                    background: color!(0x111111),
-                    foreground: color!(0x1C1C1C),
-                },
-                normal: NormalColors {
-                    primary: color!(0x5E4266),
-                    secondary: color!(0x386e50),
-                    surface: color!(0x828282),
-                    error: color!(0x992B2B),
-                },
-                bright: BrightColors {
-                    primary: color!(0xBA84FC),
-                    secondary: color!(0x49eb7a),
-                    surface: color!(0xE0E0E0),
-                    error: color!(0xC13047),
-                },
-            },
-            Self::Light => ColorPalette {
-                base: BaseColors {
-                    background: color!(0xEEEEEE),
-                    foreground: color!(0xE0E0E0),
-                },
-                normal: NormalColors {
-                    primary: color!(0x818181),
-                    secondary: color!(0xF9D659),
-                    surface: color!(0x818181),
-                    error: color!(0x992B2B),
-                },
-                bright: BrightColors {
-                    primary: color!(0x673AB7),
-                    secondary: color!(0x3797A4),
-                    surface: color!(0x000000),
-                    error: color!(0xC13047),
-                },
-            },
-            Self::Lupin => ColorPalette {
-                base: BaseColors {
-                    background: color!(0x282a36),
-                    foreground: color!(0x353746),
-                },
-                normal: NormalColors {
-                    primary: color!(0x58406F),
-                    secondary: color!(0x386e50),
-                    surface: color!(0xa2a4a3),
-                    error: color!(0xA13034),
-                },
-                bright: BrightColors {
-                    primary: color!(0xbd94f9),
-                    secondary: color!(0x49eb7a),
-                    surface: color!(0xf4f8f3),
-                    error: color!(0xE63E6D),
-                },
+            Self::Dark => DARK,
+            Self::Light => LIGHT,
+            Self::Lupin => LUPIN,
+            Self::Auto => match dark_light::detect() {
+                dark_light::Mode::Dark => DARK,
+                dark_light::Mode::Light => LIGHT,
+                // we should use `default` somehow,
+                // rather than hard-coding Lupin
+                _ => LUPIN,
             },
         }
     }
@@ -109,6 +127,8 @@ impl std::fmt::Display for Theme {
                 Self::Dark => "Dark",
                 Self::Light => "Light",
                 Self::Lupin => "Lupin",
+                // should it be "Follow System"?
+                Self::Auto => "Auto (sync on startup)",
             }
         )
     }