diff --git a/plugins/devtoolsplugin/devtoolsplugin.cpp b/plugins/devtoolsplugin/devtoolsplugin.cpp
index db8ffd3..df80d05 100644
--- a/plugins/devtoolsplugin/devtoolsplugin.cpp
+++ b/plugins/devtoolsplugin/devtoolsplugin.cpp
@@ -1,15 +1,34 @@
 #include "devtoolsplugin.h"
 
+#include <memory>
+
 #include <QDebug>
 #include <QDir>
 #include <QCoreApplication>
 #include <QLocale>
+#include <QMenu>
+#include <QAction>
 
 #include "mainwindow.h"
 
+#include "logmodel.h"
+#include "logdialog.h"
+
+std::shared_ptr<LogModel> model;
+QtMessageHandler previousHandler;
+
+void myMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &message)
+{
+    previousHandler(type, context, message);
+
+    if(!model)
+        model = std::make_shared<LogModel>();
+    model->log(type, context.file, context.line, context.function, context.category, message);
+}
+
 void registerMessageHandler()
 {
-    qDebug() << "called";
+    previousHandler = qInstallMessageHandler(myMessageHandler);
 }
 
 Q_COREAPP_STARTUP_FUNCTION(registerMessageHandler)
@@ -36,5 +55,7 @@ DevToolsPlugin::DevToolsPlugin(QObject *parent) :
 
 void DevToolsPlugin::attachTo(MainWindow &mainWindow)
 {
-    //TODO
+    auto dialog = new LogDialog(&mainWindow);
+    dialog->setModel(model.get());
+    mainWindow.menuTools()->addAction(tr("Show log"), dialog, &QDialog::open);
 }
diff --git a/plugins/devtoolsplugin/devtoolsplugin.pro b/plugins/devtoolsplugin/devtoolsplugin.pro
index b22008b..d856846 100644
--- a/plugins/devtoolsplugin/devtoolsplugin.pro
+++ b/plugins/devtoolsplugin/devtoolsplugin.pro
@@ -14,11 +14,16 @@ DEPENDPATH += $$PWD/../../zeiterfassungcorelib $$PWD/../../zeiterfassungguilib
 
 DEFINES += QT_DEPRECATED_WARNINGS QT_DISABLE_DEPRECATED_BEFORE=0x060000 QT_MESSAGELOGCONTEXT
 
-HEADERS += devtoolsplugin.h
+HEADERS += devtoolsplugin.h \
+    logmodel.h \
+    logdialog.h
 
-SOURCES += devtoolsplugin.cpp
+SOURCES += devtoolsplugin.cpp \
+    logmodel.cpp \
+    logdialog.cpp
 
-FORMS +=
+FORMS += \
+    logdialog.ui
 
 RESOURCES +=
 
diff --git a/plugins/devtoolsplugin/logdialog.cpp b/plugins/devtoolsplugin/logdialog.cpp
new file mode 100644
index 0000000..8605398
--- /dev/null
+++ b/plugins/devtoolsplugin/logdialog.cpp
@@ -0,0 +1,19 @@
+#include "logdialog.h"
+#include "ui_logdialog.h"
+
+LogDialog::LogDialog(QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::LogDialog)
+{
+    ui->setupUi(this);
+}
+
+LogDialog::~LogDialog()
+{
+    delete ui;
+}
+
+void LogDialog::setModel(QAbstractItemModel *model)
+{
+    ui->treeView->setModel(model);
+}
diff --git a/plugins/devtoolsplugin/logdialog.h b/plugins/devtoolsplugin/logdialog.h
new file mode 100644
index 0000000..52ae161
--- /dev/null
+++ b/plugins/devtoolsplugin/logdialog.h
@@ -0,0 +1,24 @@
+#ifndef LOGDIALOG_H
+#define LOGDIALOG_H
+
+#include <QDialog>
+
+class QAbstractItemModel;
+
+namespace Ui { class LogDialog; }
+
+class LogDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit LogDialog(QWidget *parent = 0);
+    ~LogDialog();
+
+    void setModel(QAbstractItemModel *model);
+
+private:
+    Ui::LogDialog *ui;
+};
+
+#endif // LOGDIALOG_H
diff --git a/plugins/devtoolsplugin/logdialog.ui b/plugins/devtoolsplugin/logdialog.ui
new file mode 100644
index 0000000..eb5c262
--- /dev/null
+++ b/plugins/devtoolsplugin/logdialog.ui
@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>LogDialog</class>
+ <widget class="QDialog" name="LogDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>400</width>
+    <height>300</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Log</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout" stretch="1,0">
+   <item>
+    <widget class="QTreeView" name="treeView"/>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Close</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>LogDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>LogDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>
diff --git a/plugins/devtoolsplugin/logmodel.cpp b/plugins/devtoolsplugin/logmodel.cpp
new file mode 100644
index 0000000..2da7363
--- /dev/null
+++ b/plugins/devtoolsplugin/logmodel.cpp
@@ -0,0 +1,70 @@
+#include "logmodel.h"
+
+LogModel::LogModel(QObject *parent) :
+    QAbstractListModel(parent)
+{
+}
+
+void LogModel::log(QtMsgType type, const char *fileName, int lineNumber, const char *functionName, const char *categoryName, const QString &message)
+{
+    beginInsertRows(QModelIndex(), m_entries.count(), m_entries.count());
+    m_entries.append(Entry { QDateTime::currentDateTime(), type, fileName, lineNumber, functionName, categoryName, message });
+    endInsertRows();
+}
+
+int LogModel::rowCount(const QModelIndex &parent) const
+{
+    Q_UNUSED(parent)
+    return m_entries.count();
+}
+
+int LogModel::columnCount(const QModelIndex &parent) const
+{
+    Q_UNUSED(parent)
+    return 4;
+}
+
+QVariant LogModel::data(const QModelIndex &index, int role) const
+{
+    Q_ASSERT(index.row() < m_entries.count());
+    const auto &entry = m_entries.at(index.row());
+
+    switch(role)
+    {
+    case Qt::DisplayRole:
+    case Qt::EditRole:
+        switch(index.column())
+        {
+        case 0: return entry.type;
+        case 1: return entry.dateTime.toString(QStringLiteral("dd.MM.yyyy HH:mm:ss.zzz"));
+        case 2: return entry.functionName;
+        case 3: return entry.message;
+        }
+    }
+
+    return QVariant();
+}
+
+QVariant LogModel::headerData(int section, Qt::Orientation orientation, int role) const
+{
+    switch(orientation)
+    {
+    case Qt::Horizontal:
+        switch(role)
+        {
+        case Qt::DisplayRole:
+        case Qt::EditRole:
+            switch(section)
+            {
+            case 0: return tr("Type");
+            case 1: return tr("Timestamp");
+            case 2: return tr("Function");
+            case 3: return tr("Message");
+            }
+        }
+    default:
+        qt_noop();
+    }
+
+    return QVariant();
+}
diff --git a/plugins/devtoolsplugin/logmodel.h b/plugins/devtoolsplugin/logmodel.h
new file mode 100644
index 0000000..75d9eb5
--- /dev/null
+++ b/plugins/devtoolsplugin/logmodel.h
@@ -0,0 +1,39 @@
+#ifndef LOGMODEL_H
+#define LOGMODEL_H
+
+#include <QAbstractListModel>
+#include <QDateTime>
+#include <qlogging.h>
+#include <QList>
+
+class LogModel : public QAbstractListModel
+{
+    Q_OBJECT
+
+public:
+    explicit LogModel(QObject *parent = Q_NULLPTR);
+
+    void log(QtMsgType type, const char *fileName, int lineNumber, const char *functionName, const char *categoryName, const QString &message);
+
+    // QAbstractItemModel interface
+    int rowCount(const QModelIndex &parent) const Q_DECL_OVERRIDE;
+    int columnCount(const QModelIndex &parent) const Q_DECL_OVERRIDE;
+    QVariant data(const QModelIndex &index, int role) const Q_DECL_OVERRIDE;
+    QVariant headerData(int section, Qt::Orientation orientation, int role) const Q_DECL_OVERRIDE;
+
+private:
+    struct Entry
+    {
+        QDateTime dateTime;
+        QtMsgType type;
+        const char *fileName;
+        int lineNumber;
+        const char *functionName;
+        const char *categoryName;
+        QString message;
+    };
+
+    QList<Entry> m_entries;
+};
+
+#endif // LOGMODEL_H