diff --git a/nx/include/switch.h b/nx/include/switch.h
index 2745edc7..b687f14c 100644
--- a/nx/include/switch.h
+++ b/nx/include/switch.h
@@ -42,6 +42,7 @@ extern "C" {
 #include "switch/services/vi.h"
 #include "switch/services/nv.h"
 #include "switch/services/pm.h"
+#include "switch/services/set.h"
 
 #include "switch/gfx/gfx.h"
 #include "switch/gfx/binder.h"
diff --git a/nx/include/switch/services/set.h b/nx/include/switch/services/set.h
new file mode 100644
index 00000000..c21ae4ee
--- /dev/null
+++ b/nx/include/switch/services/set.h
@@ -0,0 +1,13 @@
+// Copyright 2018 plutoo
+#include "result.h"
+
+typedef enum {
+    ColorSetId_Light=0,
+    ColorSetId_Dark=1
+} ColorSetId;
+
+Result setsysInitialize(void);
+void setsysExit(void);
+
+/// Gets the current system theme.
+Result setsysGetColorSetId(ColorSetId* out);
diff --git a/nx/source/services/set.c b/nx/source/services/set.c
new file mode 100644
index 00000000..3953b722
--- /dev/null
+++ b/nx/source/services/set.c
@@ -0,0 +1,56 @@
+// Copyright 2018 plutoo
+#include "types.h"
+#include "result.h"
+#include "ipc.h"
+#include "services/set.h"
+#include "services/sm.h"
+
+static Service g_setsysSrv;
+
+Result setsysInitialize(void)
+{
+    if (serviceIsActive(&g_setsysSrv))
+        return MAKERESULT(Module_Libnx, LibnxError_AlreadyInitialized);
+
+    return smGetService(&g_setsysSrv, "set:sys");
+}
+
+void setsysExit(void)
+{
+    serviceClose(&g_setsysSrv);
+}
+
+Result setsysGetColorSetId(ColorSetId* out)
+{
+    IpcCommand c;
+    ipcInitialize(&c);
+
+    struct {
+        u64 magic;
+        u64 cmd_id;
+    } *raw;
+
+    raw = ipcPrepareHeader(&c, sizeof(*raw));
+
+    raw->magic = SFCI_MAGIC;
+    raw->cmd_id = 23;
+
+    Result rc = serviceIpcDispatch(&g_setsysSrv);
+
+    if (R_SUCCEEDED(rc)) {
+        IpcParsedCommand r;
+        ipcParse(&r);
+
+        struct {
+            u64 magic;
+            u64 result;
+            u32 color_set;
+        } *resp = r.Raw;
+
+        *out = resp->color_set;
+        rc = resp->result;
+    }
+
+    return rc;
+
+}