diff --git a/app/src/main/java/com/sadellie/unitto/MainActivity.kt b/app/src/main/java/com/sadellie/unitto/MainActivity.kt
index c96ea6f0..c102910d 100644
--- a/app/src/main/java/com/sadellie/unitto/MainActivity.kt
+++ b/app/src/main/java/com/sadellie/unitto/MainActivity.kt
@@ -35,6 +35,9 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.sadellie.unitto.core.ui.LocalLocale
 import com.sadellie.unitto.core.ui.LocalWindowSize
 import com.sadellie.unitto.core.ui.calculateWindowSizeClass
+import com.sadellie.unitto.core.ui.theme.LocalNumberTypography
+import com.sadellie.unitto.core.ui.theme.NumberTypographySystem
+import com.sadellie.unitto.core.ui.theme.NumberTypographyUnitto
 import com.sadellie.unitto.data.model.repository.UserPreferencesRepository
 import dagger.hilt.android.AndroidEntryPoint
 import java.util.Locale
@@ -59,9 +62,14 @@ internal class MainActivity : AppCompatActivity() {
                 ConfigurationCompat.getLocales(configuration).get(0) ?: Locale.getDefault()
             }
 
+            val numbersTypography = remember(prefs?.systemFont) {
+                if (prefs?.systemFont == true) NumberTypographySystem else NumberTypographyUnitto
+            }
+
             CompositionLocalProvider(
                 LocalLocale provides locale,
-                LocalWindowSize provides calculateWindowSizeClass(this@MainActivity)
+                LocalWindowSize provides calculateWindowSizeClass(this@MainActivity),
+                LocalNumberTypography provides numbersTypography
             ) {
                 UnittoApp(prefs)
             }
diff --git a/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/textfield/FixedInputTextFIeld.kt b/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/textfield/FixedInputTextFIeld.kt
index e53cd2da..1629a32e 100644
--- a/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/textfield/FixedInputTextFIeld.kt
+++ b/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/textfield/FixedInputTextFIeld.kt
@@ -42,7 +42,7 @@ import androidx.compose.ui.text.TextRange
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
-import com.sadellie.unitto.core.ui.theme.NumberTypographyUnitto
+import com.sadellie.unitto.core.ui.theme.LocalNumberTypography
 
 @Composable
 fun FixedInputTextField(
@@ -83,7 +83,7 @@ fun FixedInputTextField(
                 .fillMaxWidth()
                 .padding(horizontal = 8.dp)
                 .horizontalScroll(rememberScrollState(), reverseScrolling = true),
-            textStyle = NumberTypographyUnitto.displaySmall.copy(color = textColor, textAlign = TextAlign.End),
+            textStyle = LocalNumberTypography.current.displaySmall.copy(color = textColor, textAlign = TextAlign.End),
             readOnly = true,
             visualTransformation = ExpressionTransformer(formatterSymbols),
             interactionSource = expressionInteractionSource
diff --git a/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/textfield/InputTextField.kt b/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/textfield/InputTextField.kt
index 06958920..c7d34da8 100644
--- a/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/textfield/InputTextField.kt
+++ b/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/textfield/InputTextField.kt
@@ -59,7 +59,7 @@ import androidx.compose.ui.text.input.VisualTransformation
 import androidx.compose.ui.unit.Constraints
 import androidx.compose.ui.unit.TextUnit
 import androidx.compose.ui.unit.sp
-import com.sadellie.unitto.core.ui.theme.NumberTypographyUnitto
+import com.sadellie.unitto.core.ui.theme.LocalNumberTypography
 import kotlin.math.ceil
 import kotlin.math.roundToInt
 
@@ -110,7 +110,7 @@ fun ExpressionTextField(
         modifier = modifier,
         value = value,
         formattedValue = value.text.formatExpression(formatterSymbols),
-        textStyle = NumberTypographyUnitto.displayLarge.copy(color = textColor),
+        textStyle = LocalNumberTypography.current.displayLarge.copy(color = textColor),
         minRatio = minRatio,
         onValueChange = { onCursorChange(it.selection) },
         readOnly = readOnly,
@@ -165,7 +165,7 @@ fun UnformattedTextField(
     AutoSizableTextField(
         modifier = modifier,
         value = value,
-        textStyle = NumberTypographyUnitto.displayLarge.copy(color = textColor),
+        textStyle = LocalNumberTypography.current.displayLarge.copy(color = textColor),
         minRatio = minRatio,
         onValueChange = { onCursorChange(it.selection) },
         readOnly = readOnly,
diff --git a/core/ui/src/main/java/com/sadellie/unitto/core/ui/theme/Type.kt b/core/ui/src/main/java/com/sadellie/unitto/core/ui/theme/Type.kt
index 91adc70e..cce35caa 100644
--- a/core/ui/src/main/java/com/sadellie/unitto/core/ui/theme/Type.kt
+++ b/core/ui/src/main/java/com/sadellie/unitto/core/ui/theme/Type.kt
@@ -24,7 +24,9 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.material3.Typography
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.Immutable
+import androidx.compose.runtime.staticCompositionLocalOf
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.font.Font
@@ -41,6 +43,14 @@ data class NumberTypography(
     val displaySmall: TextStyle,
 )
 
+val NumberTypographySystem by lazy {
+    NumberTypography(
+        displayLarge = TypographySystem.displayLarge,
+        displayMedium = TypographySystem.displayMedium,
+        displaySmall = TypographySystem.displaySmall,
+    )
+}
+
 val NumberTypographyUnitto by lazy {
     NumberTypography(
         displayLarge = TextStyle(
@@ -67,6 +77,8 @@ val NumberTypographyUnitto by lazy {
     )
 }
 
+val LocalNumberTypography = staticCompositionLocalOf { NumberTypographySystem }
+
 val TypographySystem by lazy { Typography() }
 
 private val FontFamily.Companion.lato: FontFamily
@@ -111,20 +123,24 @@ private fun PreviewSystemTypography() {
 @Preview(widthDp = 480)
 @Composable
 private fun PreviewNumberTypography() {
-    val textStyles = mapOf(
-        "displayLarge" to NumberTypographyUnitto.displayLarge,
-        "displayMedium" to NumberTypographyUnitto.displayMedium,
-        "displaySmall" to NumberTypographyUnitto.displaySmall,
-    )
+    CompositionLocalProvider(
+        LocalNumberTypography provides NumberTypographyUnitto
+    ) {
+        val textStyles = mapOf(
+            "displayLarge" to LocalNumberTypography.current.displayLarge,
+            "displayMedium" to LocalNumberTypography.current.displayMedium,
+            "displaySmall" to LocalNumberTypography.current.displaySmall,
+        )
 
-    LazyColumn(Modifier.background(MaterialTheme.colorScheme.background)) {
-        textStyles.forEach { (label, style) ->
-            item {
-                Text(
-                    text = "$label 123 Error 7 1⁄2",
-                    style = style,
-                    color = MaterialTheme.colorScheme.onBackground
-                )
+        LazyColumn(Modifier.background(MaterialTheme.colorScheme.background)) {
+            textStyles.forEach { (label, style) ->
+                item {
+                    Text(
+                        text = "$label 123 Error 7 1⁄2",
+                        style = style,
+                        color = MaterialTheme.colorScheme.onBackground
+                    )
+                }
             }
         }
     }
diff --git a/data/model/src/main/java/com/sadellie/unitto/data/model/repository/UserPreferencesRepository.kt b/data/model/src/main/java/com/sadellie/unitto/data/model/repository/UserPreferencesRepository.kt
index d8033c5f..95fcce03 100644
--- a/data/model/src/main/java/com/sadellie/unitto/data/model/repository/UserPreferencesRepository.kt
+++ b/data/model/src/main/java/com/sadellie/unitto/data/model/repository/UserPreferencesRepository.kt
@@ -81,6 +81,8 @@ interface UserPreferencesRepository {
 
     suspend fun updateUnitConverterSorting(sorting: UnitsListSorting)
 
+    suspend fun updateSystemFont(enabled: Boolean)
+
     suspend fun updatePartialHistoryView(enabled: Boolean)
 
     suspend fun updateAcButton(enabled: Boolean)
diff --git a/data/model/src/main/java/com/sadellie/unitto/data/model/userprefs/AppPreferences.kt b/data/model/src/main/java/com/sadellie/unitto/data/model/userprefs/AppPreferences.kt
index 0276ec17..82ba34fa 100644
--- a/data/model/src/main/java/com/sadellie/unitto/data/model/userprefs/AppPreferences.kt
+++ b/data/model/src/main/java/com/sadellie/unitto/data/model/userprefs/AppPreferences.kt
@@ -26,5 +26,6 @@ interface AppPreferences {
     val monetMode: String
     val startingScreen: String
     val enableToolsExperiment: Boolean
+    val systemFont: Boolean
     val rpnMode: Boolean
 }
diff --git a/data/model/src/main/java/com/sadellie/unitto/data/model/userprefs/DisplayPreferences.kt b/data/model/src/main/java/com/sadellie/unitto/data/model/userprefs/DisplayPreferences.kt
index 7cdd5b2b..d705f69c 100644
--- a/data/model/src/main/java/com/sadellie/unitto/data/model/userprefs/DisplayPreferences.kt
+++ b/data/model/src/main/java/com/sadellie/unitto/data/model/userprefs/DisplayPreferences.kt
@@ -19,6 +19,7 @@
 package com.sadellie.unitto.data.model.userprefs
 
 interface DisplayPreferences {
+    val systemFont: Boolean
     val middleZero: Boolean
     val acButton: Boolean
 }
diff --git a/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PreferenceExt.kt b/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PreferenceExt.kt
index 4bbf7f6f..e8593b33 100644
--- a/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PreferenceExt.kt
+++ b/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PreferenceExt.kt
@@ -55,6 +55,10 @@ fun Preferences.getEnableToolsExperiment(): Boolean {
     return this[PrefsKeys.ENABLE_TOOLS_EXPERIMENT] ?: false
 }
 
+fun Preferences.getSystemFont(): Boolean {
+    return this[PrefsKeys.SYSTEM_FONT] ?: false
+}
+
 fun Preferences.getEnableVibrations(): Boolean {
     return this[PrefsKeys.ENABLE_VIBRATIONS] ?: true
 }
diff --git a/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PreferenceModels.kt b/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PreferenceModels.kt
index f97e9279..03dc71e1 100644
--- a/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PreferenceModels.kt
+++ b/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PreferenceModels.kt
@@ -40,6 +40,7 @@ data class AppPreferencesImpl(
     override val monetMode: String,
     override val startingScreen: String,
     override val enableToolsExperiment: Boolean,
+    override val systemFont: Boolean,
     override val rpnMode: Boolean,
 ) : AppPreferences
 
@@ -76,6 +77,7 @@ data class ConverterPreferencesImpl(
 ) : ConverterPreferences
 
 data class DisplayPreferencesImpl(
+    override val systemFont: Boolean,
     override val middleZero: Boolean,
     override val acButton: Boolean,
 ) : DisplayPreferences
diff --git a/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PrefsKeys.kt b/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PrefsKeys.kt
index 2b01559a..fad50d08 100644
--- a/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PrefsKeys.kt
+++ b/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/PrefsKeys.kt
@@ -32,7 +32,7 @@ object PrefsKeys {
     val MONET_MODE = stringPreferencesKey("MONET_MODE_PREF_KEY")
     val STARTING_SCREEN = stringPreferencesKey("STARTING_SCREEN_PREF_KEY")
     val ENABLE_TOOLS_EXPERIMENT = booleanPreferencesKey("ENABLE_TOOLS_EXPERIMENT_PREF_KEY")
-    // val SYSTEM_FONT = booleanPreferencesKey("SYSTEM_FONT_PREF_KEY")
+    val SYSTEM_FONT = booleanPreferencesKey("SYSTEM_FONT_PREF_KEY")
     val ENABLE_VIBRATIONS = booleanPreferencesKey("ENABLE_VIBRATIONS_PREF_KEY")
     val MIDDLE_ZERO = booleanPreferencesKey("MIDDLE_ZERO_PREF_KEY")
     val AC_BUTTON = booleanPreferencesKey("AC_BUTTON_PREF_KEY")
diff --git a/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/UserPreferences.kt b/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/UserPreferences.kt
index 7296a273..3200e24f 100644
--- a/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/UserPreferences.kt
+++ b/data/userprefs/src/main/java/com/sadellie/unitto/data/userprefs/UserPreferences.kt
@@ -58,6 +58,7 @@ class UserPreferencesRepositoryImpl @Inject constructor(
                 monetMode = preferences.getMonetMode(),
                 startingScreen = preferences.getStartingScreen(),
                 enableToolsExperiment = preferences.getEnableToolsExperiment(),
+                systemFont = preferences.getSystemFont(),
                 rpnMode = preferences.getRpnMode(),
             )
         }
@@ -106,6 +107,7 @@ class UserPreferencesRepositoryImpl @Inject constructor(
     override val displayPrefs: Flow<DisplayPreferences> = data
         .map { preferences ->
             DisplayPreferencesImpl(
+                systemFont = preferences.getSystemFont(),
                 middleZero = preferences.getMiddleZero(),
                 acButton = preferences.getAcButton(),
             )
@@ -258,6 +260,12 @@ class UserPreferencesRepositoryImpl @Inject constructor(
         }
     }
 
+    override suspend fun updateSystemFont(enabled: Boolean) {
+        dataStore.edit { preferences ->
+            preferences[PrefsKeys.SYSTEM_FONT] = enabled
+        }
+    }
+
     override suspend fun updatePartialHistoryView(enabled: Boolean) {
         dataStore.edit { preferences ->
             preferences[PrefsKeys.PARTIAL_HISTORY_VIEW] = enabled
diff --git a/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/display/DisplayScreen.kt b/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/display/DisplayScreen.kt
index 39e03aad..3bd86c4f 100644
--- a/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/display/DisplayScreen.kt
+++ b/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/display/DisplayScreen.kt
@@ -37,6 +37,7 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Colorize
 import androidx.compose.material.icons.filled.DarkMode
 import androidx.compose.material.icons.filled.ExposureZero
+import androidx.compose.material.icons.filled.FontDownload
 import androidx.compose.material.icons.filled.Language
 import androidx.compose.material.icons.filled.Palette
 import androidx.compose.material.icons.outlined.DarkMode
@@ -112,6 +113,8 @@ internal fun DisplayRoute(
                     themmoController.setMonetMode(newValue)
                     viewModel.updateMonetMode(newValue)
                 },
+                systemFont = prefs.systemFont,
+                updateSystemFont = viewModel::updateSystemFont,
                 acButton = prefs.acButton,
                 updateAcButton = viewModel::updateAcButton,
                 middleZero = prefs.middleZero,
@@ -135,6 +138,8 @@ private fun DisplayScreen(
     onColorChange: (Color) -> Unit,
     monetMode: MonetMode,
     onMonetModeChange: (MonetMode) -> Unit,
+    systemFont: Boolean,
+    updateSystemFont: (Boolean) -> Unit,
     acButton: Boolean,
     updateAcButton: (Boolean) -> Unit,
     middleZero: Boolean,
@@ -256,6 +261,14 @@ private fun DisplayScreen(
 
             Header(stringResource(R.string.settings_additional))
 
+            UnittoListItem(
+                icon = Icons.Default.FontDownload,
+                headlineText = stringResource(R.string.settings_system_font),
+                supportingText = stringResource(R.string.settings_system_font_support),
+                switchState = systemFont,
+                onSwitchChange = updateSystemFont
+            )
+
             UnittoListItem(
                 icon = UnittoIcons.Clear,
                 headlineText = stringResource(R.string.settings_ac_button),
@@ -298,6 +311,8 @@ private fun Preview() {
             onColorChange = themmoController::setCustomColor,
             monetMode = themmoController.currentMonetMode,
             onMonetModeChange = themmoController::setMonetMode,
+            systemFont = false,
+            updateSystemFont = {},
             acButton = false,
             updateAcButton = {},
             middleZero = false,
diff --git a/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/display/DisplayViewModel.kt b/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/display/DisplayViewModel.kt
index 2c139fb8..d56198bf 100644
--- a/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/display/DisplayViewModel.kt
+++ b/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/display/DisplayViewModel.kt
@@ -67,6 +67,12 @@ class DisplayViewModel @Inject constructor(
         }
     }
 
+    fun updateSystemFont(enabled: Boolean) {
+        viewModelScope.launch {
+            userPrefsRepository.updateSystemFont(enabled)
+        }
+    }
+
     fun updateAcButton(enabled: Boolean) {
         viewModelScope.launch {
             userPrefsRepository.updateAcButton(enabled)
diff --git a/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/formatting/FormattingScreen.kt b/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/formatting/FormattingScreen.kt
index 5036fa6f..b52b90fa 100644
--- a/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/formatting/FormattingScreen.kt
+++ b/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/formatting/FormattingScreen.kt
@@ -62,7 +62,7 @@ import com.sadellie.unitto.core.ui.common.UnittoScreenWithLargeTopBar
 import com.sadellie.unitto.core.ui.common.UnittoSlider
 import com.sadellie.unitto.core.ui.common.textfield.FormatterSymbols
 import com.sadellie.unitto.core.ui.common.textfield.formatExpression
-import com.sadellie.unitto.core.ui.theme.NumberTypographyUnitto
+import com.sadellie.unitto.core.ui.theme.LocalNumberTypography
 import com.sadellie.unitto.data.common.format
 import kotlin.math.ceil
 import kotlin.math.roundToInt
@@ -137,7 +137,7 @@ fun FormattingScreen(
 
                     Text(
                         text = preview,
-                        style = NumberTypographyUnitto.displayMedium,
+                        style = LocalNumberTypography.current.displayMedium,
                         maxLines = 1,
                         modifier = Modifier
                             .fillMaxWidth()