diff --git a/app/src/main/java/ua/acclorite/book_story/ui/theme/Color.kt b/app/src/main/java/ua/acclorite/book_story/ui/theme/Color.kt
index a458ef2b..a123d2e1 100644
--- a/app/src/main/java/ua/acclorite/book_story/ui/theme/Color.kt
+++ b/app/src/main/java/ua/acclorite/book_story/ui/theme/Color.kt
@@ -17,6 +17,7 @@ import ua.acclorite.book_story.ui.theme.color.aquaTheme
 import ua.acclorite.book_story.ui.theme.color.blackTheme
 import ua.acclorite.book_story.ui.theme.color.blueTheme
 import ua.acclorite.book_story.ui.theme.color.dynamicTheme
+import ua.acclorite.book_story.ui.theme.color.grayTheme
 import ua.acclorite.book_story.ui.theme.color.green2Theme
 import ua.acclorite.book_story.ui.theme.color.greenGrayTheme
 import ua.acclorite.book_story.ui.theme.color.greenTheme
@@ -52,7 +53,8 @@ enum class Theme(
     PINK2(hasThemeContrast = false, title = R.string.pink2_theme),
     YELLOW(hasThemeContrast = true, title = R.string.yellow_theme),
     YELLOW2(hasThemeContrast = false, title = R.string.yellow2_theme),
-    AQUA(hasThemeContrast = true, title = R.string.aqua_theme);
+    AQUA(hasThemeContrast = true, title = R.string.aqua_theme),
+    GRAY(hasThemeContrast = false, title = R.string.gray_theme);
 
     companion object {
         fun entries(): List<Theme> {
@@ -158,6 +160,11 @@ fun colorScheme(
             /* Aqua Theme */
             aquaTheme(isDark = darkTheme, themeContrast = themeContrast)
         }
+
+        Theme.GRAY -> {
+            /* Gray Theme */
+            grayTheme(isDark = darkTheme)
+        }
     }
 
     return if (isPureDark && darkTheme) {
diff --git a/app/src/main/java/ua/acclorite/book_story/ui/theme/color/GrayTheme.kt b/app/src/main/java/ua/acclorite/book_story/ui/theme/color/GrayTheme.kt
new file mode 100644
index 00000000..909d3a11
--- /dev/null
+++ b/app/src/main/java/ua/acclorite/book_story/ui/theme/color/GrayTheme.kt
@@ -0,0 +1,168 @@
+/*
+ * Book's Story — free and open-source Material You eBook reader.
+ * Copyright (C) 2024-2025 Acclorite
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package ua.acclorite.book_story.ui.theme.color
+
+import androidx.compose.material3.ColorScheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
+
+private val primaryLight = Color(0xFF000000)
+private val onPrimaryLight = Color(0xFFE2E2E2)
+private val primaryContainerLight = Color(0xFF3B3B3B)
+private val onPrimaryContainerLight = Color(0xFFFFFFFF)
+private val secondaryLight = Color(0xFF5E5E5E)
+private val onSecondaryLight = Color(0xFFFFFFFF)
+private val secondaryContainerLight = Color(0xFFD4D4D4)
+private val onSecondaryContainerLight = Color(0xFF1B1B1B)
+private val tertiaryLight = Color(0xFF3B3B3B)
+private val onTertiaryLight = Color(0xFFE2E2E2)
+private val tertiaryContainerLight = Color(0xFF747474)
+private val onTertiaryContainerLight = Color(0xFFFFFFFF)
+private val errorLight = Color(0xFFB3261E)
+private val onErrorLight = Color(0xFFFFFFFF)
+private val errorContainerLight = Color(0xFFF9DEDC)
+private val onErrorContainerLight = Color(0xFF410E0B)
+private val backgroundLight = Color(0xFFF9F9F9)
+private val onBackgroundLight = Color(0xFF1B1B1B)
+private val surfaceLight = Color(0xFFF9F9F9)
+private val onSurfaceLight = Color(0xFF1B1B1B)
+private val surfaceVariantLight = Color(0xFFE2E2E2)
+private val onSurfaceVariantLight = Color(0xFF474747)
+private val outlineLight = Color(0xFF777777)
+private val outlineVariantLight = Color(0xFFC6C6C6)
+private val scrimLight = Color(0xFF000000)
+private val inverseSurfaceLight = Color(0xFF131313)
+private val inverseOnSurfaceLight = Color(0xFFE2E2E2)
+private val inversePrimaryLight = Color(0xFFFFFFFF)
+private val surfaceDimLight = Color(0xFFDADADA)
+private val surfaceBrightLight = Color(0xFFF9F9F9)
+private val surfaceContainerLowestLight = Color(0xFFFFFFFF)
+private val surfaceContainerLowLight = Color(0xFFF3F3F3)
+private val surfaceContainerLight = Color(0xFFEEEEEE)
+private val surfaceContainerHighLight = Color(0xFFE8E8E8)
+private val surfaceContainerHighestLight = Color(0xFFE2E2E2)
+
+
+private val primaryDark = Color(0xFFFFFFFF)
+private val onPrimaryDark = Color(0xFF1B1B1B)
+private val primaryContainerDark = Color(0xFFD4D4D4)
+private val onPrimaryContainerDark = Color(0xFF000000)
+private val secondaryDark = Color(0xFFC6C6C6)
+private val onSecondaryDark = Color(0xFF1B1B1B)
+private val secondaryContainerDark = Color(0xFF474747)
+private val onSecondaryContainerDark = Color(0xFFE2E2E2)
+private val tertiaryDark = Color(0xFFE2E2E2)
+private val onTertiaryDark = Color(0xFF1B1B1B)
+private val tertiaryContainerDark = Color(0xFF919191)
+private val onTertiaryContainerDark = Color(0xFF000000)
+private val errorDark = Color(0xFFF2B8B5)
+private val onErrorDark = Color(0xFF601410)
+private val errorContainerDark = Color(0xFF8C1D18)
+private val onErrorContainerDark = Color(0xFFF9DEDC)
+private val backgroundDark = Color(0xFF131313)
+private val onBackgroundDark = Color(0xFFE2E2E2)
+private val surfaceDark = Color(0xFF101010)
+private val onSurfaceDark = Color(0xFFE2E2E2)
+private val surfaceVariantDark = Color(0xFF474747)
+private val onSurfaceVariantDark = Color(0xFFC6C6C6)
+private val outlineDark = Color(0xFF919191)
+private val outlineVariantDark = Color(0xFF474747)
+private val scrimDark = Color(0xFF000000)
+private val inverseSurfaceDark = Color(0xFFF9F9F9)
+private val inverseOnSurfaceDark = Color(0xFF1B1B1B)
+private val inversePrimaryDark = Color(0xFF000000)
+private val surfaceDimDark = Color(0xFF131313)
+private val surfaceBrightDark = Color(0xFF393939)
+private val surfaceContainerLowestDark = Color(0xFF0A0A0A)
+private val surfaceContainerLowDark = Color(0xFF1B1B1B)
+private val surfaceContainerDark = Color(0xFF1F1F1F)
+private val surfaceContainerHighDark = Color(0xFF2A2A2A)
+private val surfaceContainerHighestDark = Color(0xFF353535)
+
+
+@Composable
+fun grayTheme(isDark: Boolean): ColorScheme {
+    return if (isDark) {
+        darkColorScheme(
+            primary = primaryDark,
+            onPrimary = onPrimaryDark,
+            primaryContainer = primaryContainerDark,
+            onPrimaryContainer = onPrimaryContainerDark,
+            secondary = secondaryDark,
+            onSecondary = onSecondaryDark,
+            secondaryContainer = secondaryContainerDark,
+            onSecondaryContainer = onSecondaryContainerDark,
+            tertiary = tertiaryDark,
+            onTertiary = onTertiaryDark,
+            tertiaryContainer = tertiaryContainerDark,
+            onTertiaryContainer = onTertiaryContainerDark,
+            error = errorDark,
+            onError = onErrorDark,
+            errorContainer = errorContainerDark,
+            onErrorContainer = onErrorContainerDark,
+            background = backgroundDark,
+            onBackground = onBackgroundDark,
+            surface = surfaceDark,
+            onSurface = onSurfaceDark,
+            surfaceVariant = surfaceVariantDark,
+            onSurfaceVariant = onSurfaceVariantDark,
+            outline = outlineDark,
+            outlineVariant = outlineVariantDark,
+            scrim = scrimDark,
+            inverseSurface = inverseSurfaceDark,
+            inverseOnSurface = inverseOnSurfaceDark,
+            inversePrimary = inversePrimaryDark,
+            surfaceDim = surfaceDimDark,
+            surfaceBright = surfaceBrightDark,
+            surfaceContainerLowest = surfaceContainerLowestDark,
+            surfaceContainerLow = surfaceContainerLowDark,
+            surfaceContainer = surfaceContainerDark,
+            surfaceContainerHigh = surfaceContainerHighDark,
+            surfaceContainerHighest = surfaceContainerHighestDark,
+        )
+    } else {
+        lightColorScheme(
+            primary = primaryLight,
+            onPrimary = onPrimaryLight,
+            primaryContainer = primaryContainerLight,
+            onPrimaryContainer = onPrimaryContainerLight,
+            secondary = secondaryLight,
+            onSecondary = onSecondaryLight,
+            secondaryContainer = secondaryContainerLight,
+            onSecondaryContainer = onSecondaryContainerLight,
+            tertiary = tertiaryLight,
+            onTertiary = onTertiaryLight,
+            tertiaryContainer = tertiaryContainerLight,
+            onTertiaryContainer = onTertiaryContainerLight,
+            error = errorLight,
+            onError = onErrorLight,
+            errorContainer = errorContainerLight,
+            onErrorContainer = onErrorContainerLight,
+            background = backgroundLight,
+            onBackground = onBackgroundLight,
+            surface = surfaceLight,
+            onSurface = onSurfaceLight,
+            surfaceVariant = surfaceVariantLight,
+            onSurfaceVariant = onSurfaceVariantLight,
+            outline = outlineLight,
+            outlineVariant = outlineVariantLight,
+            scrim = scrimLight,
+            inverseSurface = inverseSurfaceLight,
+            inverseOnSurface = inverseOnSurfaceLight,
+            inversePrimary = inversePrimaryLight,
+            surfaceDim = surfaceDimLight,
+            surfaceBright = surfaceBrightLight,
+            surfaceContainerLowest = surfaceContainerLowestLight,
+            surfaceContainerLow = surfaceContainerLowLight,
+            surfaceContainer = surfaceContainerLight,
+            surfaceContainerHigh = surfaceContainerHighLight,
+            surfaceContainerHighest = surfaceContainerHighestLight,
+        )
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/values-uk/strings.xml b/app/src/main/res/values-uk/strings.xml
index dc538b5f..a5b1c64a 100644
--- a/app/src/main/res/values-uk/strings.xml
+++ b/app/src/main/res/values-uk/strings.xml
@@ -342,6 +342,7 @@
     <string name="yellow_theme">Венера</string>
     <string name="yellow2_theme">Макемаке</string>
     <string name="aqua_theme">Уран</string>
+    <string name="gray_theme">Япет</string>
 
     <!-- Toast messages -->
     <string name="press_again_toast">Натисніть ще раз, щоб вийти</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 18644aee..1345c030 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -366,6 +366,7 @@
     <string name="yellow_theme">Venus</string>
     <string name="yellow2_theme">Makemake</string>
     <string name="aqua_theme">Uranus</string>
+    <string name="gray_theme">Iapetus</string>
 
     <!-- Toast messages -->
     <string name="press_again_toast">Press back again to exit</string>