diff --git a/OdbDesignLib/CMakeLists.txt b/OdbDesignLib/CMakeLists.txt
index e05b3879..3eb9310d 100644
--- a/OdbDesignLib/CMakeLists.txt
+++ b/OdbDesignLib/CMakeLists.txt
@@ -1,7 +1,7 @@
 # CMakeList.txt : CMake project for OdbDesignLib
 #
 
-add_library(OdbDesign SHARED "odbdesign_export.h" "ComponentLayerDirectory.cpp" "ComponentLayerDirectory.h" "EdaDataFile.cpp" "EdaDataFile.h" "LayerDirectory.cpp" "LayerDirectory.h" "NetlistFile.cpp" "NetlistFile.h" "FileArchive.cpp" "FileArchive.h" "StepDirectory.cpp" "StepDirectory.h" "Net.h" "Net.cpp" "Component.h" "Component.cpp" "Pin.h" "Pin.cpp" "PinConnection.h" "PinConnection.cpp" "Package.h" "Package.cpp" "Part.h" "Part.cpp" "Via.h" "Via.cpp" "Design.h" "Design.cpp" "BoardSide.h" "OdbDesign.h" "DesignCache.h" "DesignCache.cpp"   "win.h"   "proto/edadatafile.pb.h" "proto/edadatafile.pb.cc" "IProtoBuffable.h" "crow_win.h" "OdbFile.h" "OdbFile.cpp"  "OdbFileRecord.h" "OdbFileRecord.cpp"   "IOdbServerApp.h" "IOdbServerApp.cpp" "OdbServerAppBase.h" "OdbServerAppBase.cpp" "RouteController.h" "RouteController.cpp")
+add_library(OdbDesign SHARED "odbdesign_export.h" "ComponentLayerDirectory.cpp" "ComponentLayerDirectory.h" "EdaDataFile.cpp" "EdaDataFile.h" "LayerDirectory.cpp" "LayerDirectory.h" "NetlistFile.cpp" "NetlistFile.h" "FileArchive.cpp" "FileArchive.h" "StepDirectory.cpp" "StepDirectory.h" "Net.h" "Net.cpp" "Component.h" "Component.cpp" "Pin.h" "Pin.cpp" "PinConnection.h" "PinConnection.cpp" "Package.h" "Package.cpp" "Part.h" "Part.cpp" "Via.h" "Via.cpp" "Design.h" "Design.cpp" "BoardSide.h" "OdbDesign.h" "DesignCache.h" "DesignCache.cpp"   "win.h"   "proto/edadatafile.pb.h" "proto/edadatafile.pb.cc" "IProtoBuffable.h" "crow_win.h" "OdbFile.h" "OdbFile.cpp"  "OdbFileRecord.h" "OdbFileRecord.cpp"   "IOdbApp.h" "IOdbApp.cpp" "OdbAppBase.h" "OdbAppBase.cpp" "RouteController.h" "RouteController.cpp" "IOdbServerApp.h" "OdbServerAppBase.h" "OdbServerAppBase.cpp" "IOdbServerApp.cpp")
 
 # required for SWIG
 set_property(TARGET OdbDesign PROPERTY POSITION_INDEPENDENT_CODE ON)
diff --git a/OdbDesignLib/IOdbApp.cpp b/OdbDesignLib/IOdbApp.cpp
new file mode 100644
index 00000000..edc74ed1
--- /dev/null
+++ b/OdbDesignLib/IOdbApp.cpp
@@ -0,0 +1 @@
+#include "IOdbServerApp.h"
\ No newline at end of file
diff --git a/OdbDesignLib/IOdbApp.h b/OdbDesignLib/IOdbApp.h
new file mode 100644
index 00000000..8f1372d4
--- /dev/null
+++ b/OdbDesignLib/IOdbApp.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include "CommandLineArgs.h"
+#include "DesignCache.h"
+#include "ExitCode.h"
+#include "odbdesign_export.h"
+
+using namespace Utils;
+
+namespace Odb::Lib
+{
+	class ODBDESIGN_EXPORT IOdbApp
+	{
+	public:
+		virtual ~IOdbApp() {}
+
+		virtual const CommandLineArgs& arguments() const = 0;		
+		virtual DesignCache& design_cache() = 0;
+
+		virtual ExitCode Run() = 0;
+
+	protected:
+		// abstract class/interface
+		IOdbApp() = default;
+		
+	};
+}
diff --git a/OdbDesignLib/IOdbServerApp.h b/OdbDesignLib/IOdbServerApp.h
index 5951a763..7745cc12 100644
--- a/OdbDesignLib/IOdbServerApp.h
+++ b/OdbDesignLib/IOdbServerApp.h
@@ -1,27 +1,20 @@
 #pragma once
 
-#include "CommandLineArgs.h"
-#include "DesignCache.h"
-#include "ExitCode.h"
+#include "IOdbApp.h"
 #include "crow_win.h"
 #include "odbdesign_export.h"
 
 namespace Odb::Lib
 {
-	class ODBDESIGN_EXPORT IOdbServerApp
+	class ODBDESIGN_EXPORT IOdbServerApp : public virtual IOdbApp
 	{
 	public:
 		virtual ~IOdbServerApp() {}
 
-		virtual const Utils::CommandLineArgs& arguments() const = 0;
 		virtual crow::SimpleApp& crow_app() = 0;
-		virtual Odb::Lib::DesignCache& design_cache() = 0;
-
-		virtual Utils::ExitCode Run() = 0;
 
 	protected:
-		// abstract class/interface
 		IOdbServerApp() = default;
-		
+
 	};
 }
diff --git a/OdbDesignLib/OdbAppBase.cpp b/OdbDesignLib/OdbAppBase.cpp
new file mode 100644
index 00000000..e0257a23
--- /dev/null
+++ b/OdbDesignLib/OdbAppBase.cpp
@@ -0,0 +1,31 @@
+#include "OdbServerAppBase.h"
+
+namespace Odb::Lib
+{
+    OdbAppBase::OdbAppBase(int argc, char* argv[])
+        : m_designCache("designs")
+        , m_commandLineArgs(argc, argv)
+    {
+    }
+
+    OdbAppBase::~OdbAppBase()
+    {       
+    }
+
+    const CommandLineArgs& OdbAppBase::arguments() const
+    {
+        return m_commandLineArgs;
+    }
+
+    DesignCache& OdbAppBase::design_cache()
+    {
+        return m_designCache;
+    }
+
+    Utils::ExitCode OdbAppBase::Run()
+    {
+        //m_crowApp.loglevel(crow::LogLevel::Debug)        
+
+        return Utils::ExitCode::Success;
+    }   
+}
\ No newline at end of file
diff --git a/OdbDesignLib/OdbAppBase.h b/OdbDesignLib/OdbAppBase.h
new file mode 100644
index 00000000..b6dd1d70
--- /dev/null
+++ b/OdbDesignLib/OdbAppBase.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include "IOdbServerApp.h"
+#include "DesignCache.h"
+#include "Logger.h"
+#include "CommandLineArgs.h"
+#include "odbdesign_export.h"
+
+using namespace Utils;
+
+namespace Odb::Lib
+{
+	class ODBDESIGN_EXPORT OdbAppBase : public virtual IOdbApp
+	{
+	public:
+		OdbAppBase(int argc, char* argv[]);
+		virtual ~OdbAppBase();
+
+		static Logger m_logger;
+		
+		const CommandLineArgs& arguments() const override;
+		DesignCache& design_cache() override;
+
+		virtual Utils::ExitCode Run() override;
+
+	protected:
+		DesignCache m_designCache;		
+		CommandLineArgs m_commandLineArgs;		
+
+	};
+}
diff --git a/OdbDesignLib/OdbServerAppBase.cpp b/OdbDesignLib/OdbServerAppBase.cpp
index 0879725d..36551670 100644
--- a/OdbDesignLib/OdbServerAppBase.cpp
+++ b/OdbDesignLib/OdbServerAppBase.cpp
@@ -1,40 +1,47 @@
 #include "OdbServerAppBase.h"
 
+
 namespace Odb::Lib
 {
-    OdbServerAppBase::OdbServerAppBase(int argc, char* argv[])
-        : m_designCache("designs")
-        , m_commandLineArgs(argc, argv)
-    {
-    }
-
-    OdbServerAppBase::~OdbServerAppBase()
-    {
-        m_vecControllers.clear();
-    }
-
-    Utils::ExitCode OdbServerAppBase::Run()
-    {
-        //m_crowApp.loglevel(crow::LogLevel::Debug)
-        m_crowApp.use_compression(crow::compression::algorithm::GZIP);
-
-        // let subclasses add controller types
-        add_controllers();
-
-        // register all controllers' routes
-        register_routes();
-
-        // run the server
-        m_crowApp.port(18080).multithreaded().run();
-
-        return Utils::ExitCode::Success;
-    }
-
-    void OdbServerAppBase::register_routes()
-    {
-        for (const auto& pController : m_vecControllers)
-        {
-            pController->register_routes();
-        }
-    }
+	Odb::Lib::OdbServerAppBase::OdbServerAppBase(int argc, char* argv[])
+		: OdbAppBase(argc, argv)
+	{
+	}
+
+	Odb::Lib::OdbServerAppBase::~OdbServerAppBase()
+	{
+		m_vecControllers.clear();
+	}
+
+	ExitCode Odb::Lib::OdbServerAppBase::Run()
+	{
+		auto result = OdbAppBase::Run();
+		if (result != ExitCode::Success) return result;
+
+		m_crowApp.use_compression(crow::compression::algorithm::GZIP);
+
+		// let subclasses add controller types
+		add_controllers();
+
+		// register all added controllers' routes
+		register_routes();
+
+		// run the server
+		m_crowApp.port(18080).multithreaded().run();
+
+		return ExitCode::Success;
+	}
+
+	crow::SimpleApp& Odb::Lib::OdbServerAppBase::crow_app()
+	{
+		return m_crowApp;
+	}
+
+	void OdbServerAppBase::register_routes()
+	{
+		for (const auto& pController : m_vecControllers)
+		{
+			pController->register_routes();
+		}
+	}
 }
\ No newline at end of file
diff --git a/OdbDesignLib/OdbServerAppBase.h b/OdbDesignLib/OdbServerAppBase.h
index de32862e..a0a9974c 100644
--- a/OdbDesignLib/OdbServerAppBase.h
+++ b/OdbDesignLib/OdbServerAppBase.h
@@ -1,42 +1,31 @@
 #pragma once
 
 #include "IOdbServerApp.h"
-#include "crow_win.h"
-#include "DesignCache.h"
-#include "Logger.h"
-#include "CommandLineArgs.h"
+#include "OdbAppBase.h"
 #include "RouteController.h"
+#include "crow_win.h"
 #include "odbdesign_export.h"
 
-using namespace Utils;
-
 namespace Odb::Lib
 {
-	class ODBDESIGN_EXPORT OdbServerAppBase : public IOdbServerApp
+	class ODBDESIGN_EXPORT OdbServerAppBase : public OdbAppBase, public IOdbServerApp
 	{
 	public:
 		OdbServerAppBase(int argc, char* argv[]);
 		virtual ~OdbServerAppBase();
 
-		static Logger m_logger;
+		crow::SimpleApp& crow_app() override;
 
-		inline const CommandLineArgs& arguments() const override { return m_commandLineArgs; }
-		inline crow::SimpleApp& crow_app() override { return m_crowApp; }
-		inline DesignCache& design_cache() override { return m_designCache; }
-
-		virtual Utils::ExitCode Run() override;
+		ExitCode Run() override;		
 
 	protected:
-		DesignCache m_designCache;
 		crow::SimpleApp m_crowApp;
-		CommandLineArgs m_commandLineArgs;
-		RouteController::Vector m_vecControllers;		
-		
+		RouteController::Vector m_vecControllers;
+
 		// implement in subclasses to add route controllers
-		virtual void add_controllers() = 0;		
+		virtual void add_controllers() = 0;
 
 	private:
 		void register_routes();
-
 	};
 }