diff --git a/app/src/main/kotlin/com/subtracks/SubtracksApp.kt b/app/src/main/kotlin/com/subtracks/SubtracksApp.kt
index cd2ed7dc..44c95eb3 100644
--- a/app/src/main/kotlin/com/subtracks/SubtracksApp.kt
+++ b/app/src/main/kotlin/com/subtracks/SubtracksApp.kt
@@ -5,6 +5,7 @@ import coil3.ImageLoader
 import coil3.SingletonImageLoader
 import coil3.annotation.DelicateCoilApi
 import coil3.network.okhttp.OkHttpNetworkFetcherFactory
+import com.subtracks.data.LegacyDataCleanup
 import com.subtracks.data.prefs.UserPreferences
 import com.subtracks.data.repo.ArtworkSeedStore
 import com.subtracks.di.appModule
@@ -25,6 +26,7 @@ class SubtracksApp : Application() {
     override fun onCreate() {
         super.onCreate()
         Log.init(this)
+        LegacyDataCleanup.run(this)
         stopKoin()
         SingletonImageLoader.reset()
         val koin =
diff --git a/app/src/main/kotlin/com/subtracks/data/LegacyDataCleanup.kt b/app/src/main/kotlin/com/subtracks/data/LegacyDataCleanup.kt
new file mode 100644
index 00000000..157db816
--- /dev/null
+++ b/app/src/main/kotlin/com/subtracks/data/LegacyDataCleanup.kt
@@ -0,0 +1,41 @@
+package com.subtracks.data
+
+import android.content.Context
+import com.subtracks.log.Log
+import java.io.File
+
+// One-shot cleanup of the 1.x React Native app, which shipped as com.subtracks before this rewrite.
+// It left an AsyncStorage database (RKStorage), an older `servers` dump and a downloaded/cached
+// artwork+audio tree (under the app's external files dir) that v3 never reads. Only a real 1.x upgrade
+// has those paths, so a fresh install does nothing and an upgrade is cleaned exactly once.
+//
+// Delete this file and its call in SubtracksApp once installs can no longer be coming from 1.x.
+internal object LegacyDataCleanup {
+    fun run(context: Context) {
+        // The cached trees can be large, so keep the walk off the main thread.
+        Thread { run(context.dataDir, context.getExternalFilesDir(null)) }.start()
+    }
+
+    internal fun run(
+        dataDir: File,
+        externalFilesDir: File?,
+    ) {
+        val database = File(dataDir, "databases/RKStorage")
+        val servers = File(dataDir, "files/servers")
+        val cache = externalFilesDir?.let { File(it, "s") }
+        if (!database.exists() && !servers.exists() && cache?.exists() != true) return
+        deleteDatabase(database)
+        deleteTree(servers)
+        cache?.let(::deleteTree)
+    }
+
+    private fun deleteDatabase(database: File) {
+        listOf("", "-wal", "-shm", "-journal").forEach { deleteTree(File(database.path + it)) }
+    }
+
+    private fun deleteTree(target: File) {
+        if (!target.exists()) return
+        val removed = target.deleteRecursively()
+        Log.i("legacy", "removed ${target.path} ($removed)")
+    }
+}
diff --git a/app/src/test/kotlin/com/subtracks/data/LegacyDataCleanupTest.kt b/app/src/test/kotlin/com/subtracks/data/LegacyDataCleanupTest.kt
new file mode 100644
index 00000000..18b1ad2b
--- /dev/null
+++ b/app/src/test/kotlin/com/subtracks/data/LegacyDataCleanupTest.kt
@@ -0,0 +1,67 @@
+package com.subtracks.data
+
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Rule
+import org.junit.Test
+import org.junit.rules.TemporaryFolder
+import java.io.File
+
+class LegacyDataCleanupTest {
+    @get:Rule
+    val tmp = TemporaryFolder()
+
+    @Test
+    fun removesThe1xLeftoversAndLeavesTheNativeData() {
+        val dataDir = tmp.newFolder("data")
+        val external = tmp.newFolder("external")
+
+        val legacyDatabase = file(dataDir, "databases/RKStorage")
+        val legacyDatabaseWal = file(dataDir, "databases/RKStorage-wal")
+        val legacyServers = file(dataDir, "files/servers/0.json")
+        val legacyCache = file(external, "s/0/coverArt/cover")
+        val nativeDatabase = file(dataDir, "databases/subtracks.db")
+        val nativeDownload = file(external, "Music/downloads/song.mp3")
+
+        LegacyDataCleanup.run(dataDir, external)
+
+        assertFalse(legacyDatabase.exists())
+        assertFalse(legacyDatabaseWal.exists())
+        assertFalse(legacyServers.exists())
+        assertFalse(legacyCache.exists())
+        assertTrue(nativeDatabase.exists())
+        assertTrue(nativeDownload.exists())
+    }
+
+    @Test
+    fun leavesTheNativeDataAloneOnAFreshInstall() {
+        val dataDir = tmp.newFolder("data2")
+        val external = tmp.newFolder("external2")
+        val nativeDatabase = file(dataDir, "databases/subtracks.db")
+        val nativeDownload = file(external, "Music/downloads/song.mp3")
+
+        LegacyDataCleanup.run(dataDir, external)
+
+        assertTrue(nativeDatabase.exists())
+        assertTrue(nativeDownload.exists())
+    }
+
+    @Test
+    fun cleansUpEvenWhenExternalStorageIsUnavailable() {
+        val dataDir = tmp.newFolder("data3")
+        val legacyDatabase = file(dataDir, "databases/RKStorage")
+
+        LegacyDataCleanup.run(dataDir, null)
+
+        assertFalse(legacyDatabase.exists())
+    }
+
+    private fun file(
+        dir: File,
+        path: String,
+    ): File =
+        File(dir, path).apply {
+            parentFile?.mkdirs()
+            createNewFile()
+        }
+}