diff --git a/Sources/PowerSync/Kotlin/KotlinPowerSyncDatabaseImpl.swift b/Sources/PowerSync/Kotlin/KotlinPowerSyncDatabaseImpl.swift
index aa81d1d..5097007 100644
--- a/Sources/PowerSync/Kotlin/KotlinPowerSyncDatabaseImpl.swift
+++ b/Sources/PowerSync/Kotlin/KotlinPowerSyncDatabaseImpl.swift
@@ -62,7 +62,7 @@ final class KotlinPowerSyncDatabaseImpl: PowerSyncDatabaseProtocol,
             params: resolvedOptions.params.mapValues { $0.toKotlinMap() },
             options: createSyncOptions(
                 newClient: resolvedOptions.newClientImplementation,
-                userAgent: "PowerSync Swift SDK",
+                userAgent: userAgent(),
                 loggingConfig: resolvedOptions.clientConfiguration?.requestLogger?.toKotlinConfig()
             )
         )
diff --git a/Sources/PowerSync/Kotlin/sync/UserAgent.swift b/Sources/PowerSync/Kotlin/sync/UserAgent.swift
new file mode 100644
index 0000000..f56792b
--- /dev/null
+++ b/Sources/PowerSync/Kotlin/sync/UserAgent.swift
@@ -0,0 +1,25 @@
+import Foundation
+
+#if os(iOS)
+import UIKit
+#elseif os(macOS)
+import AppKit
+#endif
+
+func userAgent() -> String {
+    let libraryVersion = "1.0.0" // TODO: Replace with actual library version
+    
+    #if os(iOS)
+    let osName = "iOS"
+    let osVersion = UIDevice.current.systemVersion
+    #elseif os(macOS)
+    let osName = "macOS"
+    let version = ProcessInfo.processInfo.operatingSystemVersion
+    let osVersion = "\(version.majorVersion).\(version.minorVersion)"
+    #else
+    let osName = "unknown"
+    let osVersion = ProcessInfo.processInfo.operatingSystemVersionString
+    #endif
+    
+    return "powersync-swift/\(libraryVersion) \(osName)/\(osVersion)"
+}
\ No newline at end of file