diff --git a/src/main/d3d9-monitor-check/main.c b/src/main/d3d9-monitor-check/main.c
new file mode 100644
index 0000000..4866986
--- /dev/null
+++ b/src/main/d3d9-monitor-check/main.c
@@ -0,0 +1,41 @@
+#include <string.h>
+
+#include "d3d9-monitor-check/cmdline.h"
+#include "d3d9-monitor-check/interactive.h"
+#include "d3d9-monitor-check/print-console.h"
+
+static void _print_synopsis()
+{
+    printfln_err("D3D9 monitor check tool");
+    printfln_err("");
+    printfln_err("A versatile tool for running various (music game relevant) monitor tests using the D3D9 rendering API");
+    printfln_err("");
+    printfln_err("Available commands:");
+    printfln_err("  cmdline: Run the tool in command line mode");
+    printfln_err("  interactive: Run the tool in interactive mode");
+}
+
+int main(int argc, char **argv)
+{
+    const char *command;
+    bool success;
+
+    if (argc < 2) {
+        _print_synopsis();
+        printfln_err("ERROR: Insufficient arguments");
+        return 1;
+    }
+
+    command = argv[1];
+
+    if (!strcmp(command, "cmdline")) {
+        success = cmdline_main(argc - 2, argv + 2);
+    } else if (!strcmp(command, "interactive")) {
+        success = interactive_main(argc - 2, argv + 2);
+    } else {
+        _print_synopsis();
+        success = false;
+    }
+
+    return success ? 0 : 1;
+}
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