diff --git a/app/src/main/java/pl/firmatpp/kierowca/data/sync/DriverSyncRepository.kt b/app/src/main/java/pl/firmatpp/kierowca/data/sync/DriverSyncRepository.kt
index 918b904..ee77139 100644
--- a/app/src/main/java/pl/firmatpp/kierowca/data/sync/DriverSyncRepository.kt
+++ b/app/src/main/java/pl/firmatpp/kierowca/data/sync/DriverSyncRepository.kt
@@ -70,6 +70,9 @@ class DriverSyncRepository(
         )
     }
 
+    suspend fun hasBootstrapCache(date: String?): Boolean =
+        dao.bootstrap(date ?: currentDateFallback()) != null
+
     suspend fun routeFromCache(routeId: String): CachedValue<RouteResponse>? {
         val cached = dao.route(routeId) ?: return null
         return CachedValue(
diff --git a/app/src/main/java/pl/firmatpp/kierowca/data/sync/StartupOfflineFallbackLoader.kt b/app/src/main/java/pl/firmatpp/kierowca/data/sync/StartupOfflineFallbackLoader.kt
new file mode 100644
index 0000000..09b51b5
--- /dev/null
+++ b/app/src/main/java/pl/firmatpp/kierowca/data/sync/StartupOfflineFallbackLoader.kt
@@ -0,0 +1,27 @@
+package pl.firmatpp.kierowca.data.sync
+
+import java.io.IOException
+import kotlinx.coroutines.withTimeoutOrNull
+import pl.firmatpp.kierowca.domain.StartupSessionPolicy
+
+class StartupOfflineFallbackLoader(
+    private val timeoutMillis: Long = StartupSessionPolicy.OFFLINE_FALLBACK_MILLIS,
+) {
+    suspend fun <T> load(
+        onlineLoad: suspend () -> T,
+        offlineLoad: suspend () -> T?,
+    ): T {
+        val onlineValue = withTimeoutOrNull(timeoutMillis) {
+            onlineLoad()
+        }
+        if (onlineValue != null) {
+            return onlineValue
+        }
+
+        return offlineLoad()
+            ?: throw IOException(
+                "Serwer nie odpowiedział w ciągu ${StartupSessionPolicy.OFFLINE_FALLBACK_SECONDS} sekund " +
+                    "i w telefonie nie ma zapisanych danych offline.",
+            )
+    }
+}
diff --git a/app/src/main/java/pl/firmatpp/kierowca/domain/StartupSessionPolicy.kt b/app/src/main/java/pl/firmatpp/kierowca/domain/StartupSessionPolicy.kt
new file mode 100644
index 0000000..c59b8f8
--- /dev/null
+++ b/app/src/main/java/pl/firmatpp/kierowca/domain/StartupSessionPolicy.kt
@@ -0,0 +1,51 @@
+package pl.firmatpp.kierowca.domain
+
+data class StartupSessionMessage(
+    val title: String,
+    val detail: String,
+)
+
+object StartupSessionPolicy {
+    const val OFFLINE_BUTTON_DELAY_SECONDS = 4
+    const val OFFLINE_FALLBACK_SECONDS = 15
+    const val OFFLINE_FALLBACK_MILLIS = OFFLINE_FALLBACK_SECONDS * 1_000L
+
+    fun remainingSeconds(elapsedSeconds: Int): Int =
+        (OFFLINE_FALLBACK_SECONDS - elapsedSeconds).coerceAtLeast(0)
+
+    fun shouldShowOfflineButton(elapsedSeconds: Int, offlineDataAvailable: Boolean): Boolean =
+        offlineDataAvailable && elapsedSeconds >= OFFLINE_BUTTON_DELAY_SECONDS
+
+    fun message(elapsedSeconds: Int): StartupSessionMessage = when {
+        elapsedSeconds < 3 -> StartupSessionMessage(
+            title = "Sprawdzamy zapisaną sesję",
+            detail = "Odczytujemy bezpieczne logowanie kierowcy.",
+        )
+        elapsedSeconds < 6 -> StartupSessionMessage(
+            title = "Potwierdzamy logowanie",
+            detail = "Łączymy telefon z serwerem.",
+        )
+        elapsedSeconds < 9 -> StartupSessionMessage(
+            title = "Pobieramy aktualne kursy",
+            detail = "Synchronizujemy plan dnia i ustawienia aplikacji.",
+        )
+        elapsedSeconds < 12 -> StartupSessionMessage(
+            title = "To trwa dłużej niż zwykle",
+            detail = "Przy słabym zasięgu skorzystamy z danych zapisanych w telefonie.",
+        )
+        else -> StartupSessionMessage(
+            title = "Przygotowujemy tryb offline",
+            detail = "Za chwilę pokażemy ostatnie zapisane kursy.",
+        )
+    }
+
+    fun countdownLabel(elapsedSeconds: Int): String {
+        val remaining = remainingSeconds(elapsedSeconds)
+
+        return if (remaining > 0) {
+            "Tryb offline najpóźniej za $remaining s"
+        } else {
+            "Otwieramy zapisane dane offline"
+        }
+    }
+}
diff --git a/app/src/main/java/pl/firmatpp/kierowca/ui/DriverApp.kt b/app/src/main/java/pl/firmatpp/kierowca/ui/DriverApp.kt
index b353aed..cf20c86 100644
--- a/app/src/main/java/pl/firmatpp/kierowca/ui/DriverApp.kt
+++ b/app/src/main/java/pl/firmatpp/kierowca/ui/DriverApp.kt
@@ -12,9 +12,12 @@ import android.location.LocationManager
 import android.net.Uri
 import android.os.Build
 import android.provider.Settings
+import androidx.compose.animation.AnimatedContent
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
+import androidx.compose.animation.togetherWith
+import androidx.compose.animation.core.tween
 import androidx.activity.compose.BackHandler
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.PickVisualMediaRequest
@@ -115,6 +118,7 @@ import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.ui.unit.Dp
@@ -159,6 +163,7 @@ import pl.firmatpp.kierowca.diagnostics.DiagnosticSeverity
 import pl.firmatpp.kierowca.sync.LiveSyncConnectionState
 import pl.firmatpp.kierowca.domain.OtpCodeExtractor
 import pl.firmatpp.kierowca.domain.RouteDisplayMapper
+import pl.firmatpp.kierowca.domain.StartupSessionPolicy
 import pl.firmatpp.kierowca.ui.theme.AppThemeMode
 import pl.firmatpp.kierowca.ui.theme.TppTheme
 
@@ -247,7 +252,10 @@ fun DriverApp(
 
     Box(Modifier.fillMaxSize().background(TppTheme.colors.surface)) {
         when (state.screen) {
-            DriverScreen.Initializing -> StartupScreen()
+            DriverScreen.Initializing -> StartupScreen(
+                offlineDataAvailable = state.startupOfflineAvailable,
+                onUseOfflineNow = viewModel::useOfflineStartupDataNow,
+            )
             DriverScreen.Phone -> PhoneScreen(state, viewModel::requestOtp)
             DriverScreen.Otp -> OtpScreen(state, viewModel::updateOtpCode, viewModel::verifyOtp, viewModel::back)
             DriverScreen.Routes -> RoutesScreen(
@@ -392,7 +400,21 @@ fun DriverApp(
 }
 
 @Composable
-private fun StartupScreen() {
+private fun StartupScreen(
+    offlineDataAvailable: Boolean,
+    onUseOfflineNow: () -> Unit,
+) {
+    var elapsedSeconds by remember { mutableStateOf(0) }
+    LaunchedEffect(Unit) {
+        while (elapsedSeconds < StartupSessionPolicy.OFFLINE_FALLBACK_SECONDS) {
+            delay(1_000L)
+            elapsedSeconds += 1
+        }
+    }
+    val sessionMessage = StartupSessionPolicy.message(elapsedSeconds)
+    val countdownLabel = StartupSessionPolicy.countdownLabel(elapsedSeconds)
+    val showOfflineButton = StartupSessionPolicy.shouldShowOfflineButton(elapsedSeconds, offlineDataAvailable)
+
     BoxWithConstraints(
         Modifier
             .fillMaxSize()
@@ -417,13 +439,100 @@ private fun StartupScreen() {
                 verticalArrangement = Arrangement.Center,
             ) {
                 CircularProgressIndicator(color = TppTheme.colors.forest)
-                Spacer(Modifier.height(20.dp))
+                Spacer(Modifier.height(22.dp))
                 Text(
-                    "Sprawdzanie sesji",
-                    color = TppTheme.colors.muted,
+                    "URUCHAMIAMY APLIKACJĘ",
+                    color = TppTheme.colors.forest,
                     fontFamily = FontFamily.Monospace,
-                    fontWeight = FontWeight.SemiBold,
+                    fontWeight = FontWeight.Bold,
+                    fontSize = 12.sp,
                 )
+                Spacer(Modifier.height(10.dp))
+                AnimatedContent(
+                    targetState = sessionMessage,
+                    transitionSpec = {
+                        fadeIn(animationSpec = tween(260)) togetherWith
+                            fadeOut(animationSpec = tween(220))
+                    },
+                    label = "startup-session-message",
+                ) { message ->
+                    Column(
+                        modifier = Modifier.heightIn(min = 72.dp),
+                        horizontalAlignment = Alignment.CenterHorizontally,
+                        verticalArrangement = Arrangement.Top,
+                    ) {
+                        Text(
+                            message.title,
+                            modifier = Modifier.fillMaxWidth(),
+                            color = TppTheme.colors.ink,
+                            fontWeight = FontWeight.Bold,
+                            style = MaterialTheme.typography.titleMedium,
+                            textAlign = TextAlign.Center,
+                        )
+                        Spacer(Modifier.height(6.dp))
+                        Text(
+                            message.detail,
+                            modifier = Modifier.fillMaxWidth(),
+                            color = TppTheme.colors.muted,
+                            style = MaterialTheme.typography.bodyMedium,
+                            textAlign = TextAlign.Center,
+                        )
+                    }
+                }
+                Spacer(Modifier.height(14.dp))
+                Card(
+                    colors = CardDefaults.cardColors(containerColor = TppTheme.colors.panel),
+                    border = BorderStroke(1.dp, TppTheme.colors.outline.copy(alpha = 0.72f)),
+                    shape = RoundedCornerShape(6.dp),
+                ) {
+                    Column(
+                        modifier = Modifier.padding(horizontal = 18.dp, vertical = 12.dp),
+                        horizontalAlignment = Alignment.CenterHorizontally,
+                    ) {
+                        AnimatedContent(
+                            targetState = countdownLabel,
+                            transitionSpec = {
+                                fadeIn(animationSpec = tween(180)) togetherWith
+                                    fadeOut(animationSpec = tween(140))
+                            },
+                            label = "startup-offline-countdown",
+                        ) { label ->
+                            Text(
+                                label,
+                                color = TppTheme.colors.forest,
+                                fontFamily = FontFamily.Monospace,
+                                fontWeight = FontWeight.Bold,
+                            )
+                        }
+                        Spacer(Modifier.height(4.dp))
+                        Text(
+                            "Jeśli kursy były wcześniej zapisane w telefonie.",
+                            color = TppTheme.colors.muted,
+                            fontSize = 12.sp,
+                        )
+                    }
+                }
+                AnimatedVisibility(
+                    visible = showOfflineButton,
+                    enter = fadeIn(animationSpec = tween(260)),
+                    exit = fadeOut(animationSpec = tween(160)),
+                ) {
+                    Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                        Spacer(Modifier.height(12.dp))
+                        OutlinedButton(
+                            onClick = onUseOfflineNow,
+                            modifier = Modifier.fillMaxWidth().heightIn(min = 48.dp),
+                            border = BorderStroke(1.dp, TppTheme.colors.forest),
+                            colors = ButtonDefaults.outlinedButtonColors(contentColor = TppTheme.colors.forest),
+                            shape = RoundedCornerShape(6.dp),
+                        ) {
+                            Text(
+                                "Przejdź do trybu offline teraz",
+                                fontWeight = FontWeight.Bold,
+                            )
+                        }
+                    }
+                }
             }
         }
     }
diff --git a/app/src/main/java/pl/firmatpp/kierowca/ui/DriverViewModel.kt b/app/src/main/java/pl/firmatpp/kierowca/ui/DriverViewModel.kt
index fa8d3f7..a63414f 100644
--- a/app/src/main/java/pl/firmatpp/kierowca/ui/DriverViewModel.kt
+++ b/app/src/main/java/pl/firmatpp/kierowca/ui/DriverViewModel.kt
@@ -22,6 +22,7 @@ import pl.firmatpp.kierowca.data.DriverRepository
 import pl.firmatpp.kierowca.data.PhotoUploadMetadata
 import pl.firmatpp.kierowca.data.sync.DriverSyncRepository
 import pl.firmatpp.kierowca.data.sync.NetworkMonitor
+import pl.firmatpp.kierowca.data.sync.StartupOfflineFallbackLoader
 import pl.firmatpp.kierowca.data.model.DispatchSheetReminderDto
 import pl.firmatpp.kierowca.data.model.DriverDto
 import pl.firmatpp.kierowca.data.model.DriverLeaveCalendarEntryDto
@@ -61,6 +62,7 @@ data class DriverUiState(
     val screen: DriverScreen = DriverScreen.Initializing,
     val loading: Boolean = true,
     val refreshing: Boolean = false,
+    val startupOfflineAvailable: Boolean = false,
     val phone: String = "",
     val otpCode: String = "",
     val maskedPhone: String = "",
@@ -188,6 +190,7 @@ class DriverViewModel(application: Application) : AndroidViewModel(application)
     private val appPreferencesStore = AppPreferencesStore(application)
     private val repository = DriverRepository(application)
     private val syncRepository = DriverSyncRepository(application, repository)
+    private val startupOfflineFallbackLoader = StartupOfflineFallbackLoader()
     private val networkMonitor = NetworkMonitor(application)
     private val photoUploadOutbox = PhotoUploadOutbox(application)
     private val routeActionOutbox = RouteActionOutbox(application)
@@ -215,6 +218,7 @@ class DriverViewModel(application: Application) : AndroidViewModel(application)
     private var leaveCalendarRequestGeneration: Long = 0
     private var routesRequestGeneration: Long = 0
     private var routeDetailRequestGeneration: Long = 0
+    private var routesLoadJob: Job? = null
     val state: StateFlow<DriverUiState> = _state
 
     init {
@@ -295,6 +299,8 @@ class DriverViewModel(application: Application) : AndroidViewModel(application)
         }
         viewModelScope.launch {
             if (repository.hasToken()) {
+                val offlineAvailable = syncRepository.hasBootstrapCache(_state.value.selectedDate)
+                _state.update { it.copy(startupOfflineAvailable = offlineAvailable) }
                 refreshRoutes()
             } else {
                 _state.update { it.copy(screen = DriverScreen.Phone, loading = false) }
@@ -338,6 +344,20 @@ class DriverViewModel(application: Application) : AndroidViewModel(application)
 
     fun refreshRoutesSilently() = loadRoutes(date = _state.value.selectedDate, showLoading = false, navigateToRoutes = false)
 
+    fun useOfflineStartupDataNow() {
+        val snapshot = _state.value
+        if (snapshot.screen != DriverScreen.Initializing || !snapshot.startupOfflineAvailable) {
+            return
+        }
+
+        loadRoutes(
+            date = snapshot.selectedDate,
+            showLoading = true,
+            navigateToRoutes = true,
+            startupOfflineOnly = true,
+        )
+    }
+
     fun onAppForegrounded() {
         DriverRuntimeSyncState.foreground = true
         liveSyncClient.setForeground(true)
@@ -365,17 +385,31 @@ class DriverViewModel(application: Application) : AndroidViewModel(application)
         _state.update { it.copy(routeDayLiveUpdateMessage = null) }
     }
 
-    private fun loadRoutes(date: String?, showLoading: Boolean, navigateToRoutes: Boolean) {
+    private fun loadRoutes(
+        date: String?,
+        showLoading: Boolean,
+        navigateToRoutes: Boolean,
+        startupOfflineOnly: Boolean = false,
+    ) {
         val generation = ++routesRequestGeneration
-        viewModelScope.launch {
+        routesLoadJob?.cancel()
+        routesLoadJob = viewModelScope.launch {
+            val isStartup = _state.value.screen == DriverScreen.Initializing
             _state.update { it.copy(loading = showLoading, refreshing = !showLoading, feedback = null, error = null) }
 
             runCatching {
-                val cached = if (_state.value.isOnline) {
-                    syncRepository.bootstrap(date)
-                } else {
-                    syncRepository.bootstrapFromCache(date)
+                val cached = when {
+                    startupOfflineOnly -> syncRepository.bootstrapFromCache(date)
                         ?: throw IOException("Brak zapisanych danych dla wybranego dnia.")
+                    !_state.value.isOnline -> syncRepository.bootstrapFromCache(date)
+                        ?: throw IOException("Brak zapisanych danych dla wybranego dnia.")
+                    isStartup -> {
+                        startupOfflineFallbackLoader.load(
+                            onlineLoad = { syncRepository.bootstrap(date) },
+                            offlineLoad = { syncRepository.bootstrapFromCache(date) },
+                        )
+                    }
+                    else -> syncRepository.bootstrap(date)
                 }
                 val response = cached.value
                 val settings = response.driverAppSettings
diff --git a/app/src/test/java/pl/firmatpp/kierowca/data/sync/StartupOfflineFallbackLoaderTest.kt b/app/src/test/java/pl/firmatpp/kierowca/data/sync/StartupOfflineFallbackLoaderTest.kt
new file mode 100644
index 0000000..e6dc503
--- /dev/null
+++ b/app/src/test/java/pl/firmatpp/kierowca/data/sync/StartupOfflineFallbackLoaderTest.kt
@@ -0,0 +1,70 @@
+package pl.firmatpp.kierowca.data.sync
+
+import java.io.IOException
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.test.runTest
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class StartupOfflineFallbackLoaderTest {
+    @Test
+    fun returnsServerDataBeforeTimeout() = runTest {
+        val loader = StartupOfflineFallbackLoader(timeoutMillis = 1_000L)
+
+        val result = loader.load(
+            onlineLoad = { "server" },
+            offlineLoad = { "cache" },
+        )
+
+        assertEquals("server", result)
+    }
+
+    @Test
+    fun returnsCachedDataWhenServerExceedsTimeout() = runTest {
+        val loader = StartupOfflineFallbackLoader(timeoutMillis = 1_000L)
+
+        val result = loader.load(
+            onlineLoad = {
+                delay(2_000L)
+                "server"
+            },
+            offlineLoad = { "cache" },
+        )
+
+        assertEquals("cache", result)
+    }
+
+    @Test
+    fun reportsMissingOfflineDataAfterTimeout() = runTest {
+        val loader = StartupOfflineFallbackLoader(timeoutMillis = 1_000L)
+
+        val error = runCatching {
+            loader.load(
+                onlineLoad = {
+                    delay(2_000L)
+                    "server"
+                },
+                offlineLoad = { null },
+            )
+        }.exceptionOrNull()
+
+        assertTrue(error is IOException)
+    }
+
+    @Test
+    fun doesNotHideAuthenticationFailures() = runTest {
+        val loader = StartupOfflineFallbackLoader(timeoutMillis = 1_000L)
+        val authenticationFailure = IllegalStateException("401")
+
+        val error = runCatching {
+            loader.load(
+                onlineLoad = { throw authenticationFailure },
+                offlineLoad = { "cache" },
+            )
+        }.exceptionOrNull()
+
+        assertTrue(error is IllegalStateException)
+        assertEquals(authenticationFailure.message, error?.message)
+    }
+}
diff --git a/app/src/test/java/pl/firmatpp/kierowca/domain/StartupSessionPolicyTest.kt b/app/src/test/java/pl/firmatpp/kierowca/domain/StartupSessionPolicyTest.kt
new file mode 100644
index 0000000..468b6cd
--- /dev/null
+++ b/app/src/test/java/pl/firmatpp/kierowca/domain/StartupSessionPolicyTest.kt
@@ -0,0 +1,32 @@
+package pl.firmatpp.kierowca.domain
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class StartupSessionPolicyTest {
+    @Test
+    fun rotatesStartupMessagesAsWaitingTimeIncreases() {
+        assertEquals("Sprawdzamy zapisaną sesję", StartupSessionPolicy.message(0).title)
+        assertEquals("Potwierdzamy logowanie", StartupSessionPolicy.message(3).title)
+        assertEquals("Pobieramy aktualne kursy", StartupSessionPolicy.message(6).title)
+        assertEquals("To trwa dłużej niż zwykle", StartupSessionPolicy.message(9).title)
+        assertEquals("Przygotowujemy tryb offline", StartupSessionPolicy.message(12).title)
+    }
+
+    @Test
+    fun countsDownToOfflineFallbackWithoutGoingBelowZero() {
+        assertEquals(15, StartupSessionPolicy.remainingSeconds(0))
+        assertEquals(7, StartupSessionPolicy.remainingSeconds(8))
+        assertEquals(0, StartupSessionPolicy.remainingSeconds(15))
+        assertEquals(0, StartupSessionPolicy.remainingSeconds(30))
+        assertEquals("Tryb offline najpóźniej za 5 s", StartupSessionPolicy.countdownLabel(10))
+        assertEquals("Otwieramy zapisane dane offline", StartupSessionPolicy.countdownLabel(15))
+    }
+
+    @Test
+    fun showsManualOfflineButtonAfterFourSecondsOnlyWhenCacheExists() {
+        assertEquals(false, StartupSessionPolicy.shouldShowOfflineButton(3, offlineDataAvailable = true))
+        assertEquals(true, StartupSessionPolicy.shouldShowOfflineButton(4, offlineDataAvailable = true))
+        assertEquals(false, StartupSessionPolicy.shouldShowOfflineButton(10, offlineDataAvailable = false))
+    }
+}