diff --git a/wetter/app/src/main/java/app/wetter/ui/screens/SettingsScreen.kt b/wetter/app/src/main/java/app/wetter/ui/screens/SettingsScreen.kt
new file mode 100644
index 0000000..e9f3aa7
--- /dev/null
+++ b/wetter/app/src/main/java/app/wetter/ui/screens/SettingsScreen.kt
@@ -0,0 +1,120 @@
+package app.wetter.ui.screens
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.selection.selectableGroup
+import androidx.compose.foundation.selection.toggleable
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.rounded.ArrowBack
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SegmentedButton
+import androidx.compose.material3.SegmentedButtonDefaults
+import androidx.compose.material3.SingleChoiceSegmentedButtonRow
+import androidx.compose.material3.Switch
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.Role
+import androidx.compose.ui.semantics.heading
+import androidx.compose.ui.semantics.semantics
+import app.wetter.R
+import app.wetter.data.DistanceUnit
+import app.wetter.data.Graph
+import app.wetter.data.PrecipUnit
+import app.wetter.data.PressureUnit
+import app.wetter.data.Settings
+import app.wetter.data.TempUnit
+import app.wetter.data.ThemeMode
+import app.wetter.data.WindUnit
+import app.wetter.ui.theme.WSpace
+import app.wetter.ui.theme.WType
+import kotlinx.coroutines.launch
+
+/** S08 + S09: units, look, data sources. */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SettingsScreen(settings: Settings, onBack: () -> Unit) {
+    val scope = rememberCoroutineScope()
+    val set: ((Settings) -> Settings) -> Unit = { t -> scope.launch { Graph.settings.update(t) } }
+    Scaffold(
+        topBar = {
+            TopAppBar(
+                title = { Text(stringResource(R.string.settings)) },
+                navigationIcon = { IconButton(onClick = onBack) { Icon(Icons.AutoMirrored.Rounded.ArrowBack, stringResource(R.string.back)) } },
+            )
+        },
+    ) { pad ->
+        Column(Modifier.padding(pad).verticalScroll(rememberScrollState()).padding(horizontal = WSpace.s16)) {
+            Header(stringResource(R.string.set_units))
+            Choice(stringResource(R.string.set_temp), TempUnit.entries, settings.temp, { if (it == TempUnit.C) "°C" else "°F" }) { v -> set { it.copy(temp = v) } }
+            Choice(stringResource(R.string.set_wind), WindUnit.entries, settings.wind, {
+                when (it) { WindUnit.KMH -> "km/h"; WindUnit.MS -> "m/s"; WindUnit.MPH -> "mph"; WindUnit.KN -> "kn" }
+            }) { v -> set { it.copy(wind = v) } }
+            Choice(stringResource(R.string.set_precip), PrecipUnit.entries, settings.precip, { if (it == PrecipUnit.MM) "mm" else "in" }) { v -> set { it.copy(precip = v) } }
+            Choice(stringResource(R.string.set_pressure), PressureUnit.entries, settings.pressure, { if (it == PressureUnit.HPA) "hPa" else "inHg" }) { v -> set { it.copy(pressure = v) } }
+            Choice(stringResource(R.string.set_distance), DistanceUnit.entries, settings.distance, { if (it == DistanceUnit.KM) "km" else "mi" }) { v -> set { it.copy(distance = v) } }
+
+            Header(stringResource(R.string.set_look))
+            val themeLabels = mapOf(
+                ThemeMode.SYSTEM to stringResource(R.string.theme_system),
+                ThemeMode.LIGHT to stringResource(R.string.theme_light),
+                ThemeMode.DARK to stringResource(R.string.theme_dark),
+            )
+            Choice(stringResource(R.string.set_theme), ThemeMode.entries, settings.theme, { themeLabels.getValue(it) }) { v -> set { it.copy(theme = v) } }
+            Toggle(stringResource(R.string.set_animations), stringResource(R.string.set_animations_sub), settings.animations) { v -> set { it.copy(animations = v) } }
+            Toggle(stringResource(R.string.set_brief), null, settings.brief) { v -> set { it.copy(brief = v) } }
+
+            Header(stringResource(R.string.set_about))
+            Text(stringResource(R.string.attribution), style = WType.bodySm, color = MaterialTheme.colorScheme.onSurfaceVariant, modifier = Modifier.padding(bottom = WSpace.s32))
+        }
+    }
+}
+
+@Composable
+private fun Header(text: String) = Text(
+    text, style = WType.title, color = MaterialTheme.colorScheme.primary,
+    modifier = Modifier.padding(top = WSpace.s24, bottom = WSpace.s8).semantics { heading() },
+)
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun <T> Choice(label: String, options: List<T>, selected: T, name: (T) -> String, onPick: (T) -> Unit) {
+    Column(Modifier.padding(vertical = WSpace.s8)) {
+        Text(label, style = WType.body)
+        SingleChoiceSegmentedButtonRow(Modifier.fillMaxWidth().padding(top = WSpace.s8).selectableGroup()) {
+            options.forEachIndexed { i, o ->
+                SegmentedButton(
+                    selected = o == selected,
+                    onClick = { onPick(o) },
+                    shape = SegmentedButtonDefaults.itemShape(i, options.size),
+                ) { Text(name(o)) }
+            }
+        }
+    }
+}
+
+@Composable
+private fun Toggle(label: String, sub: String?, checked: Boolean, onChange: (Boolean) -> Unit) {
+    Row(
+        Modifier.fillMaxWidth().toggleable(checked, role = Role.Switch, onValueChange = onChange).padding(vertical = WSpace.s12),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        Column(Modifier.weight(1f)) {
+            Text(label, style = WType.body)
+            if (sub != null) Text(sub, style = WType.bodySm, color = MaterialTheme.colorScheme.onSurfaceVariant)
+        }
+        Switch(checked, onCheckedChange = null)
+    }
+}