diff --git a/libsrc/core/archive.hpp b/libsrc/core/archive.hpp
index 6a4a0792..1fedde76 100644
--- a/libsrc/core/archive.hpp
+++ b/libsrc/core/archive.hpp
@@ -106,7 +106,7 @@ namespace ngcore
   protected:
     bool shallow_to_python = false;
     std::map<std::string, VersionInfo> version_map = GetLibraryVersions();
-    std::shared_ptr<spdlog::logger> logger = GetLogger("Archive");
+    std::shared_ptr<Logger> logger = GetLogger("Archive");
   public:
     Archive() = delete;
     Archive(const Archive&) = delete;
@@ -211,6 +211,7 @@ namespace ngcore
     // don't use it that often anyway)
     Archive& operator& (std::vector<bool>& v)
     {
+      logger->debug("In special archive for std::vector<bool>");
       size_t size;
       if(Output())
         size = v.size();
@@ -295,11 +296,11 @@ namespace ngcore
     {
       if(Output())
         {
-          NETGEN_DEBUG_LOG(logger, "Store shared ptr of type " + Demangle(typeid(T).name()));
+          logger->debug("Store shared ptr of type {}", Demangle(typeid(T).name()));
           // save -2 for nullptr
           if(!ptr)
             {
-              NETGEN_DEBUG_LOG(logger, "Storing nullptr");
+              logger->debug("Storing nullptr");
               return (*this) << -2;
             }
 
@@ -308,8 +309,9 @@ namespace ngcore
           // Downcasting is only possible for our registered classes
           if(typeid(T) != typeid(*ptr))
             {
-              NETGEN_DEBUG_LOG(logger, "Typids are different: " + Demangle(typeid(T).name()) + " vs. " +
-                               Demangle(typeid(*ptr).name()));
+              logger->debug("Typids are different: {} vs {}",
+                            Demangle(typeid(T).name()),
+                            Demangle(typeid(*ptr).name()));
               if(!IsRegistered(Demangle(typeid(*ptr).name())))
                   throw Exception(std::string("Archive error: Polymorphic type ")
                                   + Demangle(typeid(*ptr).name())
@@ -318,7 +320,7 @@ namespace ngcore
               // if there was a true downcast we have to store more information
               if(reg_ptr != static_cast<void*>(ptr.get()))
                 {
-                  NETGEN_DEBUG_LOG(logger, "Multiple/Virtual inheritance involved, need to cast pointer");
+                  logger->debug("Multiple/Virtual inheritance involved, need to cast pointer");
                   neededDowncast = true;
                 }
             }
@@ -326,8 +328,8 @@ namespace ngcore
           // if not found store -1 and the pointer
           if(pos == shared_ptr2nr.end())
             {
-              NETGEN_DEBUG_LOG(logger, "Didn't find the shared_ptr, create new registry entry at " +
-                               std::to_string(shared_ptr_count));
+              logger->debug("Didn't find the shared_ptr, create new registry entry at {}",
+                            shared_ptr_count);
               auto p = ptr.get();
               (*this) << -1;
               (*this) & neededDowncast & p;
@@ -338,27 +340,27 @@ namespace ngcore
               return *this;
             }
           // if found store the position and if it has to be downcasted and how
-          NETGEN_DEBUG_LOG(logger, "Found shared_ptr at position " + std::to_string(pos->second));
+          logger->debug("Found shared_ptr at position {}", pos->second);
           (*this) << pos->second << neededDowncast;
           if(neededDowncast)
             (*this) << Demangle(typeid(*ptr).name());
         }
       else // Input
         {
-          NETGEN_DEBUG_LOG(logger, "Reading shared_ptr of type " + Demangle(typeid(T).name()));
+          logger->debug("Reading shared_ptr of type {}", Demangle(typeid(T).name()));
           int nr;
           (*this) & nr;
           // -2 restores a nullptr
           if(nr == -2)
             {
-              NETGEN_DEBUG_LOG(logger, "Reading a nullptr");
+              logger->debug("Reading a nullptr");
               ptr = nullptr;
               return *this;
             }
           // -1 restores a new shared ptr by restoring the inner pointer and creating a shared_ptr to it
           if (nr == -1)
             {
-              NETGEN_DEBUG_LOG(logger, "Createing new shared_ptr");
+              logger->debug("Createing new shared_ptr");
               T* p = nullptr;
               bool neededDowncast;
               (*this) & neededDowncast & p;
@@ -366,7 +368,7 @@ namespace ngcore
               // if we did downcast we need to store a shared_ptr<void> to the true object
               if(neededDowncast)
                 {
-                  NETGEN_DEBUG_LOG(logger, "Shared pointer needed downcasting");
+                  logger->debug("Shared pointer needed downcasting");
                   std::string name;
                   (*this) & name;
                   auto info = GetArchiveRegister(name);
@@ -378,19 +380,19 @@ namespace ngcore
                 }
               else
                 {
-                  NETGEN_DEBUG_LOG(logger, "Shared pointer didn't need downcasting");
+                  logger->debug("Shared pointer didn't need downcasting");
                   nr2shared_ptr.push_back(ptr);
                 }
             }
           else
             {
-              NETGEN_DEBUG_LOG(logger, "Reading already existing pointer at entry " + std::to_string(nr));
+              logger->debug("Reading already existing pointer at entry {}", nr);
               auto other = nr2shared_ptr[nr];
               bool neededDowncast;
               (*this) & neededDowncast;
               if(neededDowncast)
                 {
-                  NETGEN_DEBUG_LOG(logger, "Shared pointer needed pointer downcast");
+                  logger->debug("Shared pointer needed pointer downcast");
                   // if there was a downcast we can expect the class to be registered (since archiving
                   // wouldn't have worked else)
                   std::string name;
@@ -404,7 +406,7 @@ namespace ngcore
                 }
               else
                 {
-                  NETGEN_DEBUG_LOG(logger, "Shared pointer didn't need pointer casts");
+                  logger->debug("Shared pointer didn't need pointer casts");
                   ptr = std::static_pointer_cast<T>(other);
                 }
             }
@@ -418,18 +420,19 @@ namespace ngcore
     {
       if (Output())
         {
-          NETGEN_DEBUG_LOG(logger, "Store pointer of type " + Demangle(typeid(T).name()));
+          logger->debug("Store pointer of type {}",Demangle(typeid(T).name()));
           // if the pointer is null store -2
           if (!p)
             {
-              NETGEN_DEBUG_LOG(logger, "Storing nullptr");
+              logger->debug("Storing nullptr");
               return (*this) << -2;
             }
           auto reg_ptr = static_cast<void*>(p);
           if(typeid(T) != typeid(*p))
             {
-              NETGEN_DEBUG_LOG(logger, "Typeids are different: " + Demangle(typeid(T).name()) + " vs. " +
-                               Demangle(typeid(*p).name()));
+              logger->debug("Typeids are different: {} vs {}",
+                            Demangle(typeid(T).name()),
+                            Demangle(typeid(*p).name()));
               if(!IsRegistered(Demangle(typeid(*p).name())))
                 throw Exception(std::string("Archive error: Polymorphic type ")
                                 + Demangle(typeid(*p).name())
@@ -437,20 +440,20 @@ namespace ngcore
               reg_ptr = GetArchiveRegister(Demangle(typeid(*p).name())).downcaster(typeid(T), static_cast<void*>(p));
               if(reg_ptr != static_cast<void*>(p))
                 {
-                  NETGEN_DEBUG_LOG(logger, "Multiple/Virtual inheritance involved, need to cast pointer");
+                  logger->debug("Multiple/Virtual inheritance involved, need to cast pointer");
                 }
             }
           auto pos = ptr2nr.find(reg_ptr);
           // if the pointer is not found in the map create a new entry
           if (pos == ptr2nr.end())
             {
-              NETGEN_DEBUG_LOG(logger, "Didn't find pointer, create new registry entry at " +
-                               std::to_string(ptr_count));
+              logger->debug("Didn't find pointer, create new registry entry at {}",
+                            ptr_count);
               ptr2nr[reg_ptr] = ptr_count++;
               if(typeid(*p) == typeid(T))
                 if (std::is_constructible<T>::value)
                                {
-                                 NETGEN_DEBUG_LOG(logger, "Store standard class pointer (no virt. inh,...)");
+                                 logger->debug("Store standard class pointer (no virt. inh,...)");
                                  return (*this) << -1 & (*p);
                                }
                 else
@@ -466,7 +469,7 @@ namespace ngcore
                     throw Exception(std::string("Archive error: Polymorphic type ")
                                     + Demangle(typeid(*p).name())
                                     + " not registered for archive");
-                  NETGEN_DEBUG_LOG(logger, "Store a possibly more complicated pointer");
+                  logger->debug("Store a possibly more complicated pointer");
                   return (*this) << -3 << Demangle(typeid(*p).name()) & (*p);
                 }
             }
@@ -474,39 +477,37 @@ namespace ngcore
             {
               (*this) & pos->second;
               bool downcasted = !(reg_ptr == static_cast<void*>(p) );
-              NETGEN_DEBUG_LOG(logger, "Store a the existing position in registry at " +
-                               std::to_string(pos->second));
-              NETGEN_DEBUG_LOG(logger, std::string("Pointer ") + (downcasted ? "needs " : "doesn't need ") +
-                               "downcasting");
+              logger->debug("Store a the existing position in registry at {}", pos->second);
+              logger->debug("Pointer {} downcasting", downcasted ? "needs" : "doesn't need");
               // store if the class has been downcasted and the name
               (*this) << downcasted << Demangle(typeid(*p).name());
             }
         }
       else
         {
-          NETGEN_DEBUG_LOG(logger, "Reading pointer of type " + Demangle(typeid(T).name()));
+          logger->debug("Reading pointer of type {}", Demangle(typeid(T).name()));
           int nr;
           (*this) & nr;
           if (nr == -2) // restore a nullptr
             {
-              NETGEN_DEBUG_LOG(logger, "Loading a nullptr");
+              logger->debug("Loading a nullptr");
               p = nullptr;
             }
           else if (nr == -1) // create a new pointer of standard type (no virtual or multiple inheritance,...)
             {
-              NETGEN_DEBUG_LOG(logger, "Load a new pointer to a simple class");
+              logger->debug("Load a new pointer to a simple class");
               p = detail::constructIfPossible<T>();
               nr2ptr.push_back(p);
               (*this) & *p;
             }
           else if(nr == -3) // restore one of our registered classes that can have multiple inheritance,...
             {
-              NETGEN_DEBUG_LOG(logger, "Load a new pointer to a potentially more complicated class "
-                               "(allows for multiple/virtual inheritance,...)");
+              logger->debug("Load a new pointer to a potentially more complicated class "
+                            "(allows for multiple/virtual inheritance,...)");
               // As stated above, we want this special behaviour only for our classes that implement DoArchive
               std::string name;
               (*this) & name;
-              NETGEN_DEBUG_LOG(logger, "Name = " + name);
+              logger->debug("Name = {}", name);
               auto info = GetArchiveRegister(name);
               // the creator creates a new object of type name, and returns a void* pointing
               // to T (which may have an offset)
@@ -518,13 +519,11 @@ namespace ngcore
             }
           else
             {
-              NETGEN_DEBUG_LOG(logger, "Restoring pointer to already existing object at registry position " +
-                               std::to_string(nr));
+              logger->debug("Restoring pointer to already existing object at registry position {}", nr);
               bool downcasted;
               std::string name;
               (*this) & downcasted & name;
-              NETGEN_DEBUG_LOG(logger, std::string(downcasted ? "Downcasted" : "Not downcasted") +
-                               " object of type " + name);
+              logger->debug("{} object of type {}", downcasted ? "Downcasted" : "Not downcasted", name);
               if(downcasted)
                 {
                   // if the class has been downcasted we can assume it is in the register
diff --git a/libsrc/core/logging.cpp b/libsrc/core/logging.cpp
index 467255cd..eaaedf02 100644
--- a/libsrc/core/logging.cpp
+++ b/libsrc/core/logging.cpp
@@ -1,15 +1,29 @@
-
 #include "logging.hpp"
 
 #ifdef NETGEN_USE_SPDLOG
 
+#include <spdlog/spdlog.h>
 #include <spdlog/sinks/ansicolor_sink.h>
 #include <spdlog/sinks/basic_file_sink.h>
 
+#else // NETGEN_USE_SPDLOG
+#include <iostream>
 #endif // NETGEN_USE_SPDLOG
 
+
 namespace ngcore
 {
+
+  void Logger::log(level::level_enum level, std::string && s)
+  {
+#ifdef NETGEN_USE_SPDLOG
+    logger->log(spdlog::level::level_enum(level), s);
+#else // NETGEN_USE_SPDLOG
+    if(level>level::debug)
+      std::clog << s << '\n';
+#endif // NETGEN_USE_SPDLOG
+  }
+
 #ifdef NETGEN_USE_SPDLOG
   namespace detail
   {
@@ -28,12 +42,12 @@ namespace ngcore
     }
   } // namespace detail
 
-  std::shared_ptr<spdlog::logger> GetLogger(const std::string& name)
+  std::shared_ptr<Logger> GetLogger(const std::string& name)
   {
     auto logger = spdlog::get(name);
     if(!logger)
       logger = detail::CreateDefaultLogger(name);
-    return logger;
+    return std::make_shared<Logger>(logger);
   }
 
   void SetLoggingLevel(spdlog::level::level_enum level, const std::string& name)
@@ -49,7 +63,7 @@ namespace ngcore
     auto sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>(filename);
     sink->set_level(level);
     if(!logger.empty())
-      GetLogger(logger)->sinks().push_back(sink);
+      GetLogger(logger)->logger->sinks().push_back(sink);
     else
       {
         detail::GetDefaultSinks().push_back(sink);
@@ -62,7 +76,7 @@ namespace ngcore
     auto sink = std::make_shared<spdlog::sinks::ansicolor_stdout_sink_mt>();
     sink->set_level(level);
     if(!logger.empty())
-      GetLogger(logger)->sinks().push_back(sink);
+      GetLogger(logger)->logger->sinks().push_back(sink);
     else
       {
         detail::GetDefaultSinks().push_back(sink);
@@ -73,7 +87,7 @@ namespace ngcore
   void ClearLoggingSinks(const std::string& logger)
   {
     if(!logger.empty())
-      GetLogger(logger)->sinks().clear();
+      GetLogger(logger)->logger->sinks().clear();
     else
       {
         detail::GetDefaultSinks().clear();
@@ -84,26 +98,40 @@ namespace ngcore
   void FlushOnLoggingLevel(spdlog::level::level_enum level, const std::string& logger)
   {
     if(!logger.empty())
-      GetLogger(logger)->flush_on(level);
+      GetLogger(logger)->logger->flush_on(level);
     else
       spdlog::flush_on(level);
   }
 
 #else // NETGEN_USE_SPDLOG
+} //namespace ngcore
+
+namespace spdlog
+{
+  class logger
+  {
+    public:
+    logger() = default;
+  };
+} // namespace spdlog
+
+namespace ngcore
+{
 
   // Dummy functions if no spdlog is available
 
-  std::shared_ptr<spdlog::logger> GetLogger(const std::string& /*unused*/)
+  std::shared_ptr<Logger> GetLogger(const std::string& /*unused*/)
   {
-    return std::make_shared<spdlog::logger>();
+    return std::make_shared<Logger>(std::make_shared<spdlog::logger>());
   }
-  void SetLoggingLevel(spdlog::level::level_enum /*unused*/, const std::string& /*unused*/) {}
-  void AddFileSink(const std::string& /*unused*/, spdlog::level::level_enum /*unused*/,
-                   const std::string& /*unused*/)
+
+  void SetLoggingLevel(level::level_enum /*unused*/, const std::string& /*unused*/) {}
+  void AddFileSink(const std::string& /*unused*/, level::level_enum /*unused*/,
+      const std::string& /*unused*/)
   {}
-  void AddConsoleSink(spdlog::level::level_enum /*unused*/, const std::string& /*unused*/) {}
+  void AddConsoleSink(level::level_enum /*unused*/, const std::string& /*unused*/) {}
   void ClearLoggingSinks(const std::string& /*unused*/) {}
-  void FlushOnLoggingLevel(spdlog::level::level_enum /*unused*/, const std::string& /*unused*/) {}
+  void FlushOnLoggingLevel(level::level_enum /*unused*/, const std::string& /*unused*/) {}
+} //namespace ngcore
 
 #endif // NETGEN_USE_SPDLOG
-} //namespace ngcore
diff --git a/libsrc/core/logging.hpp b/libsrc/core/logging.hpp
index d5fbf1ac..1553ad54 100644
--- a/libsrc/core/logging.hpp
+++ b/libsrc/core/logging.hpp
@@ -1,108 +1,124 @@
 #ifndef NETGEN_CORE_LOGGING_HPP
 #define NETGEN_CORE_LOGGING_HPP
 
+#undef NETGEN_USE_SPDLOG
+#include <iostream>
 #include <memory>
 #include <string>
 #include <vector>
 
+#include "exception.hpp"
 #include "ngcore_api.hpp"
+#include "utils.hpp"
 
 #ifdef NETGEN_USE_SPDLOG
-
+#include <spdlog/fmt/fmt.h>
+#include <spdlog/fmt/ostr.h> // to be able to parse anything to logger that implements operator << ostream
 #ifdef NETGEN_LOG_DEBUG
 #define SPDLOG_DEBUG_ON
-#endif // NETGEN_LOG_DEBUG
-
-#include <spdlog/logger.h>
-#include <spdlog/sinks/sink.h>
-#include <spdlog/spdlog.h>
-
 #define NETGEN_DEBUG_LOG(logger, ...) SPDLOG_DEBUG(logger, __VA_ARGS__)
+#endif // NETGEN_LOG_DEBUG
+#endif // NETGEN_USE_SPDLOG
 
-#else // NETGEN_USE_SPDLOG
-
-#include <iostream>
+#ifndef NETGEN_DEBUG_LOG
+#define NETGEN_DEBUG_LOG(logger, ...)
+#endif  // NETGEN_DEBUG_LOG
 
 namespace spdlog
 {
-  // Dummys if Netgen is compiled with USE_SPDLOG=OFF.
-  namespace level
-  {
-    enum level_enum
-      {
-       trace = 0,
-       debug = 1,
-       info = 2,
-       warn = 3,
-       err = 4,
-       critical = 5,
-       off = 6
-      };
-  } // namespace level
-
-  class logger
-  {
-  public:
-    void log_helper() {}
-
-    template<typename T>
-    void log_helper( T t) { std::clog << t; }
-
-    template<typename T, typename ... Args>
-    void log_helper( T t, Args ... args)
-    {
-        std::clog << t;
-        log_helper(args...);
-        std::clog << ", ";
-    }
-
-    template<typename ... Args>
-    void log( level::level_enum level, const char* fmt, Args ... args)
-    {
-        std::clog << level << ": " << fmt << "\t Arguments: ";
-        log_helper(args...);
-        std::clog << "\n";
-    }
-
-    template<typename ... Args>
-    void trace( const char* fmt, Args ... args) { log(level::level_enum::trace, fmt, args...); }
-    template<typename ... Args>
-    void debug( const char* fmt, Args ... args) { log(level::level_enum::debug, fmt, args...); }
-    template<typename ... Args>
-    void info( const char* fmt, Args ... args) { log(level::level_enum::info, fmt, args...); }
-    template<typename ... Args>
-    void warn( const char* fmt, Args ... args) { log(level::level_enum::warn, fmt, args...); }
-    template<typename ... Args>
-    void error( const char* fmt, Args ... args) { log(level::level_enum::err, fmt, args...); }
-    template<typename ... Args>
-    void critical( const char* fmt, Args ... args) { log(level::level_enum::critical, fmt, args...); }
-  };
-
-  namespace sinks
-  {
-    class sink {};
-  } // namespace sinks
-
-} //namespace spdlog
-
-#define NETGEN_DEBUG_LOG(logger, ...)
-
-#endif // NETGEN_USE_SPDLOG
+  class logger;
+} // namespace spdlog
 
 namespace ngcore
 {
-  namespace detail
+  namespace level
   {
-    std::vector<std::shared_ptr<spdlog::sinks::sink>>& GetDefaultSinks();
-    inline std::shared_ptr<spdlog::logger> CreateDefaultLogger(const std::string& name);
-  } //namespace detail
+    enum level_enum
+    {
+      trace = 0,
+      debug = 1,
+      info = 2,
+      warn = 3,
+      err = 4,
+      critical = 5,
+      off = 6
+    };
+  } // namespace level
 
-  NGCORE_API std::shared_ptr<spdlog::logger> GetLogger(const std::string& name);
-  NGCORE_API void SetLoggingLevel(spdlog::level::level_enum level, const std::string& name);
-  NGCORE_API void AddFileSink(const std::string& filename, spdlog::level::level_enum level, const std::string& logger);
-  NGCORE_API void AddConsoleSink(spdlog::level::level_enum level, const std::string& logger);
+  class Logger
+  {
+  public:
+    std::shared_ptr<spdlog::logger> logger;
+
+    Logger(std::shared_ptr<spdlog::logger> l) : logger(std::move(l)) {}
+
+    void NGCORE_API log( level::level_enum level, std::string && s);
+
+#ifdef NETGEN_USE_SPDLOG
+    template<typename ... Args>
+    void log( level::level_enum level, const char* str, Args ... args)
+    {
+      log(level, fmt::format(str, args...));
+    }
+#else // NETGEN_USE_SPDLOG
+    template<typename T>
+    std::string replace(std::string s, const T & t)
+    {
+      auto p0 = s.find_first_of('{');
+      auto p1 = s.find_first_of('}', p0);
+      if(p0==std::string::npos || p1==std::string::npos)
+        throw Exception("invalid format string");
+      s.replace(p0, p1-p0+1, ToString(t));
+      return s;
+    }
+
+    std::string log_helper(std::string s)
+    {
+      return s;
+    }
+
+    template<typename T>
+    std::string log_helper(std::string s,  const T &t)
+    {
+      return replace(s,t);
+    }
+
+    template<typename T, typename ... Args>
+    std::string log_helper( std::string s, const T &t, Args ... args)
+    {
+      return log_helper(replace(s,t), args...);
+    }
+
+    template<typename ... Args>
+    void log( level::level_enum level, const char* str, Args ... args)
+    {
+      log(level, log_helper(std::string(str), args...));
+    }
+#endif // NETGEN_USE_SPDLOG
+
+    template<typename ... Args>
+    void trace( const char* str, Args ... args) { log(level::level_enum::trace, str, args...); }
+    template<typename ... Args>
+    void debug( const char* str, Args ... args) { log(level::level_enum::debug, str, args...); }
+    template<typename ... Args>
+    void info( const char* str, Args ... args) { log(level::level_enum::info, str, args...); }
+    template<typename ... Args>
+    void warn( const char* str, Args ... args) { log(level::level_enum::warn, str, args...); }
+    template<typename ... Args>
+    void error( const char* str, Args ... args) { log(level::level_enum::err, str, args...); }
+    template<typename ... Args>
+    void critical( const char* str, Args ... args) { log(level::level_enum::critical, str, args...); }
+  };
+
+
+
+
+  NGCORE_API std::shared_ptr<Logger> GetLogger(const std::string& name);
+  NGCORE_API void SetLoggingLevel(level::level_enum level, const std::string& name);
+  NGCORE_API void AddFileSink(const std::string& filename, level::level_enum level, const std::string& logger);
+  NGCORE_API void AddConsoleSink(level::level_enum level, const std::string& logger);
   NGCORE_API void ClearLoggingSinks(const std::string& logger);
-  NGCORE_API void FlushOnLoggingLevel(spdlog::level::level_enum level, const std::string& logger);
+  NGCORE_API void FlushOnLoggingLevel(level::level_enum level, const std::string& logger);
 } // namespace ngcore
 
 #endif // NETGEN_CORE_LOGGING_HPP
diff --git a/libsrc/core/paje_trace.cpp b/libsrc/core/paje_trace.cpp
index 23d9e49e..29a84d04 100644
--- a/libsrc/core/paje_trace.cpp
+++ b/libsrc/core/paje_trace.cpp
@@ -92,7 +92,7 @@ namespace ngcore
 
       FILE * ctrace_stream;
       TTimePoint start_time;
-      std::shared_ptr<spdlog::logger> logger = GetLogger("PajeTrace");
+      std::shared_ptr<Logger> logger = GetLogger("PajeTrace");
 
 
       double ConvertTime(TTimePoint t) {
diff --git a/libsrc/core/paje_trace.hpp b/libsrc/core/paje_trace.hpp
index c5169fdf..96684285 100644
--- a/libsrc/core/paje_trace.hpp
+++ b/libsrc/core/paje_trace.hpp
@@ -18,7 +18,7 @@ namespace ngcore
       using TClock = std::chrono::system_clock;
 
     protected:
-      std::shared_ptr<spdlog::logger> logger = GetLogger("PajeTrace");
+      std::shared_ptr<Logger> logger = GetLogger("PajeTrace");
     private:
       NGCORE_API static size_t max_tracefile_size;
       NGCORE_API static bool trace_thread_counter;
diff --git a/libsrc/core/profiler.cpp b/libsrc/core/profiler.cpp
index 29a69182..3302342d 100644
--- a/libsrc/core/profiler.cpp
+++ b/libsrc/core/profiler.cpp
@@ -13,7 +13,7 @@ namespace ngcore
   size_t NgProfiler::dummy_thread_flops[NgProfiler::SIZE];
   size_t * NgProfiler::thread_flops = NgProfiler::dummy_thread_flops; // NOLINT
 
-  std::shared_ptr<spdlog::logger> NgProfiler::logger = GetLogger("Profiler"); // NOLINT
+  std::shared_ptr<Logger> NgProfiler::logger = GetLogger("Profiler"); // NOLINT
 
   NgProfiler :: NgProfiler()
   {
diff --git a/libsrc/core/profiler.hpp b/libsrc/core/profiler.hpp
index 96a3fc44..5a9b16e1 100644
--- a/libsrc/core/profiler.hpp
+++ b/libsrc/core/profiler.hpp
@@ -34,7 +34,7 @@ namespace ngcore
 
     NGCORE_API static TTimePoint * thread_times;
     NGCORE_API static TTimePoint * thread_flops;
-    NGCORE_API static std::shared_ptr<spdlog::logger> logger;
+    NGCORE_API static std::shared_ptr<Logger> logger;
     NGCORE_API static size_t dummy_thread_times[NgProfiler::SIZE];
     NGCORE_API static size_t dummy_thread_flops[NgProfiler::SIZE];
   private:
diff --git a/libsrc/core/python_ngcore.cpp b/libsrc/core/python_ngcore.cpp
index b7624e43..47c16740 100644
--- a/libsrc/core/python_ngcore.cpp
+++ b/libsrc/core/python_ngcore.cpp
@@ -8,14 +8,14 @@ using namespace ngcore;
 
 PYBIND11_MODULE(pyngcore, m) // NOLINT
 {
-  py::enum_<spdlog::level::level_enum>(m, "LOG_LEVEL", "Logging level")
-    .value("Trace", spdlog::level::trace)
-    .value("Debug", spdlog::level::debug)
-    .value("Info", spdlog::level::info)
-    .value("Warn", spdlog::level::warn)
-    .value("Error", spdlog::level::err)
-    .value("Critical", spdlog::level::critical)
-    .value("Off", spdlog::level::off);
+  py::enum_<level::level_enum>(m, "LOG_LEVEL", "Logging level")
+    .value("Trace", level::trace)
+    .value("Debug", level::debug)
+    .value("Info", level::info)
+    .value("Warn", level::warn)
+    .value("Error", level::err)
+    .value("Critical", level::critical)
+    .value("Off", level::off);
 
   m.def("SetLoggingLevel", &SetLoggingLevel, py::arg("level"), py::arg("logger")="",
         "Set logging level, if name is given only to the specific logger, else set the global logging level");