diff --git a/README.md b/README.md
index 2333e8a..797e438 100644
--- a/README.md
+++ b/README.md
@@ -175,6 +175,24 @@ The main exceptions are
 
 Support for JSON References is in development. It is mostly working, however some of the test cases added to [JSON Schema Test Suite](https://github.com/json-schema/JSON-Schema-Test-Suite) for v6/v7 are still failing.
 
+## JSON Inspector
+
+An example application based on Qt is also included under [inspector](./inspector). It can be used to experiment with JSON Schemas and target documents. JSON Inspector is a self-contained CMake project, so it must be built separately:
+
+```bash
+    cd inspector
+    mkdir build
+    cd build
+    cmake ..
+    make
+```
+
+Schemas and target documents can be loaded from file or entered manually. Content is parsed dynamically, so you get rapid feedback.
+
+Here is a screenshot of JSON Inspector in action:
+
+![JSON Inspector in action](./doc/inspector/screenshot.png)
+
 ## Documentation ##
 
 Doxygen documentation can be built by running 'doxygen' from the project root directory. Generated documentation will be placed in 'doc/html'. Other relevant documentation such as schemas and specifications have been included in the 'doc' directory.
diff --git a/doc/inspector/screenshot.png b/doc/inspector/screenshot.png
new file mode 100644
index 0000000..4294040
Binary files /dev/null and b/doc/inspector/screenshot.png differ
diff --git a/inspector/.gitignore b/inspector/.gitignore
new file mode 100644
index 0000000..af21fe5
--- /dev/null
+++ b/inspector/.gitignore
@@ -0,0 +1,3 @@
+build/
+cmake-build-*/
+CMakeFiles/
diff --git a/inspector/CMakeLists.txt b/inspector/CMakeLists.txt
new file mode 100644
index 0000000..8320921
--- /dev/null
+++ b/inspector/CMakeLists.txt
@@ -0,0 +1,39 @@
+# Reference: http://qt-project.org/doc/qt-5.0/qtdoc/cmake-manual.html
+
+cmake_minimum_required(VERSION 3.0)
+
+# Add folder where are supportive functions
+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+# Include Qt basic functions
+include(QtCommon)
+
+# Basic information about project
+
+project(inspector VERSION 1.0)
+
+# Set PROJECT_VERSION_PATCH and PROJECT_VERSION_TWEAK to 0 if not present, needed by add_project_meta
+fix_project_version()
+
+# Set additional project information
+set(COPYRIGHT "Copyright (c) 2020 Tristan Penman. All rights reserved.")
+set(IDENTIFIER "com.tristanpenman.valijson.inspector")
+
+set(SOURCE_FILES
+    src/highlighter.cpp
+    src/main.cpp
+    src/window.cpp
+)
+
+include_directories(SYSTEM ../include)
+
+add_project_meta(META_FILES_TO_INCLUDE)
+
+find_package(Qt5 COMPONENTS Widgets REQUIRED)
+
+add_executable(${PROJECT_NAME} ${OS_BUNDLE} # Expands to WIN32 or MACOS_BUNDLE depending on OS
+    ${SOURCE_FILES} ${META_FILES_TO_INCLUDE} ${RESOURCE_FILES}
+)
+
+target_link_libraries(${PROJECT_NAME} Qt5::Widgets)
diff --git a/inspector/cmake/MacOSXBundleInfo.plist.in b/inspector/cmake/MacOSXBundleInfo.plist.in
new file mode 100644
index 0000000..ce11313
--- /dev/null
+++ b/inspector/cmake/MacOSXBundleInfo.plist.in
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleDevelopmentRegion</key>
+    <string>English</string>
+    <key>CFBundleExecutable</key>
+    <string>${MACOSX_BUNDLE_EXECUTABLE_NAME}</string>
+    <key>CFBundleGetInfoString</key>
+    <string>${MACOSX_BUNDLE_INFO_STRING}</string>
+    <key>CFBundleIconFile</key>
+    <string>${MACOSX_BUNDLE_ICON_FILE}</string>
+    <key>CFBundleIdentifier</key>
+    <string>${MACOSX_BUNDLE_GUI_IDENTIFIER}</string>
+    <key>CFBundleInfoDictionaryVersion</key>
+    <string>6.0</string>
+    <key>CFBundleLongVersionString</key>
+    <string>${MACOSX_BUNDLE_LONG_VERSION_STRING}</string>
+    <key>CFBundleName</key>
+    <string>JSON Inspector</string>
+    <key>CFBundlePackageType</key>
+    <string>APPL</string>
+    <key>CFBundleShortVersionString</key>
+    <string>${MACOSX_BUNDLE_SHORT_VERSION_STRING}</string>
+    <key>CFBundleSignature</key>
+    <string>????</string>
+    <key>CFBundleVersion</key>
+    <string>${MACOSX_BUNDLE_BUNDLE_VERSION}</string>
+    <key>CSResourcesFileMapped</key>
+    <true/>
+    <key>LSRequiresCarbon</key>
+    <true/>
+    <key>NSHumanReadableCopyright</key>
+    <string>${MACOSX_BUNDLE_COPYRIGHT}</string>
+    <key>NSPrincipalClass</key>
+    <string>NSApplication</string>
+</dict>
+</plist>
diff --git a/inspector/cmake/QtCommon.cmake b/inspector/cmake/QtCommon.cmake
new file mode 100644
index 0000000..ef633ba
--- /dev/null
+++ b/inspector/cmake/QtCommon.cmake
@@ -0,0 +1,82 @@
+macro(fix_project_version)
+if (NOT PROJECT_VERSION_PATCH)
+    set(PROJECT_VERSION_PATCH 0)
+endif()
+
+if (NOT PROJECT_VERSION_TWEAK)
+    set(PROJECT_VERSION_TWEAK 0)
+endif()
+endmacro()
+
+macro(add_project_meta FILES_TO_INCLUDE)
+if (NOT RESOURCE_FOLDER)
+    set(RESOURCE_FOLDER res)
+endif()
+
+if (NOT ICON_NAME)
+    set(ICON_NAME AppIcon)
+endif()
+
+if (APPLE)
+    set(ICON_FILE ${RESOURCE_FOLDER}/${ICON_NAME}.icns)
+elseif (WIN32)
+    set(ICON_FILE ${RESOURCE_FOLDER}/${ICON_NAME}.ico)
+endif()
+
+if (WIN32)
+    configure_file("${PROJECT_SOURCE_DIR}/cmake/windows_metafile.rc.in"
+      "windows_metafile.rc"
+    )
+    set(RES_FILES "windows_metafile.rc")
+    set(CMAKE_RC_COMPILER_INIT windres)
+    ENABLE_LANGUAGE(RC)
+    SET(CMAKE_RC_COMPILE_OBJECT "<CMAKE_RC_COMPILER> <FLAGS> -O coff <DEFINES> -i <SOURCE> -o <OBJECT>")
+endif()
+
+if (APPLE)
+    set_source_files_properties(${ICON_FILE} PROPERTIES MACOSX_PACKAGE_LOCATION Resources)
+
+    # Identify MacOS bundle
+    set(MACOSX_BUNDLE_BUNDLE_NAME ${PROJECT_NAME})
+    set(MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION})
+    set(MACOSX_BUNDLE_LONG_VERSION_STRING ${PROJECT_VERSION})
+    set(MACOSX_BUNDLE_SHORT_VERSION_STRING "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}")
+    set(MACOSX_BUNDLE_COPYRIGHT ${COPYRIGHT})
+    set(MACOSX_BUNDLE_GUI_IDENTIFIER ${IDENTIFIER})
+    set(MACOSX_BUNDLE_ICON_FILE ${ICON_NAME})
+endif()
+
+if (APPLE)
+    set(${FILES_TO_INCLUDE} ${ICON_FILE})
+elseif (WIN32)
+    set(${FILES_TO_INCLUDE} ${RES_FILES})
+endif()
+endmacro()
+
+macro(init_os_bundle)
+if (APPLE)
+    set(OS_BUNDLE MACOSX_BUNDLE)
+elseif (WIN32)
+    set(OS_BUNDLE WIN32)
+endif()
+endmacro()
+
+macro(fix_win_compiler)
+if (MSVC)
+    set_target_properties(${PROJECT_NAME} PROPERTIES
+        WIN32_EXECUTABLE YES
+        LINK_FLAGS "/ENTRY:mainCRTStartup"
+    )
+endif()
+endmacro()
+
+macro(init_qt)
+# Let's do the CMake job for us
+set(CMAKE_AUTOMOC ON) # For meta object compiler
+set(CMAKE_AUTORCC ON) # Resource files
+set(CMAKE_AUTOUIC ON) # UI files
+endmacro()
+
+init_os_bundle()
+init_qt()
+fix_win_compiler()
diff --git a/inspector/cmake/windows_metafile.rc.in b/inspector/cmake/windows_metafile.rc.in
new file mode 100644
index 0000000..0200869
--- /dev/null
+++ b/inspector/cmake/windows_metafile.rc.in
@@ -0,0 +1,28 @@
+#include "winver.h"
+
+IDI_ICON1               ICON    DISCARDABLE     "@ICON_FILE@"
+
+VS_VERSION_INFO VERSIONINFO
+ FILEVERSION @PROJECT_VERSION_MAJOR@,@PROJECT_VERSION_MINOR@,@PROJECT_VERSION_PATCH@,@PROJECT_VERSION_TWEAK@
+ PRODUCTVERSION @PROJECT_VERSION_MAJOR@,@PROJECT_VERSION_MINOR@,@PROJECT_VERSION_PATCH@,@PROJECT_VERSION_TWEAK@
+ FILEFLAGS 0x0L
+ FILEFLAGSMASK 0x3fL
+ FILEOS 0x00040004L
+ FILETYPE 0x1L
+ FILESUBTYPE 0x0L
+BEGIN
+    BLOCK "StringFileInfo"
+    BEGIN
+        BLOCK "000004b0"
+        BEGIN
+            VALUE "CompanyName", "@COMPANY@"
+            VALUE "FileDescription", "@PROJECT_NAME@"
+            VALUE "FileVersion", "@PROJECT_VERSION@"
+            VALUE "LegalCopyright", "@COPYRIGHT@"
+            VALUE "InternalName", "@PROJECT_NAME@"
+            VALUE "OriginalFilename", "@PROJECT_NAME@.exe"
+            VALUE "ProductName", "@PROJECT_NAME@"
+            VALUE "ProductVersion", "@PROJECT_VERSION@"
+        END
+    END
+END
diff --git a/inspector/inspector.qrc b/inspector/inspector.qrc
new file mode 100644
index 0000000..7072e5a
--- /dev/null
+++ b/inspector/inspector.qrc
@@ -0,0 +1,4 @@
+<RCC version="1.0">
+	<qresource prefix="/">
+	</qresource>
+</RCC>
diff --git a/inspector/res/AppIcon.icns b/inspector/res/AppIcon.icns
new file mode 100644
index 0000000..b9854d3
Binary files /dev/null and b/inspector/res/AppIcon.icns differ
diff --git a/inspector/res/AppIcon.ico b/inspector/res/AppIcon.ico
new file mode 100644
index 0000000..20777aa
Binary files /dev/null and b/inspector/res/AppIcon.ico differ
diff --git a/inspector/src/highlighter.cpp b/inspector/src/highlighter.cpp
new file mode 100644
index 0000000..556d187
--- /dev/null
+++ b/inspector/src/highlighter.cpp
@@ -0,0 +1,12 @@
+#include "highlighter.h"
+
+Highlighter::Highlighter(QTextDocument *parent)
+  : QSyntaxHighlighter(parent)
+{
+    // TODO
+}
+
+void Highlighter::highlightBlock(const QString &text)
+{
+    // TODO
+}
diff --git a/inspector/src/highlighter.h b/inspector/src/highlighter.h
new file mode 100644
index 0000000..5eafd58
--- /dev/null
+++ b/inspector/src/highlighter.h
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <QSyntaxHighlighter>
+
+class Highlighter : public QSyntaxHighlighter
+{
+    Q_OBJECT
+
+public:
+    Highlighter(QTextDocument * parent = 0);
+
+protected:
+    void highlightBlock(const QString & text) override;
+};
diff --git a/inspector/src/main.cpp b/inspector/src/main.cpp
new file mode 100644
index 0000000..b294385
--- /dev/null
+++ b/inspector/src/main.cpp
@@ -0,0 +1,12 @@
+#include <QApplication>
+#include "window.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+
+    QApplication app(argc, argv);
+    Window window;
+    window.show();
+    return app.exec();
+}
diff --git a/inspector/src/window.cpp b/inspector/src/window.cpp
new file mode 100644
index 0000000..c59db24
--- /dev/null
+++ b/inspector/src/window.cpp
@@ -0,0 +1,206 @@
+#include <sstream>
+#include <stdexcept>
+
+#include <QFile>
+#include <QFileDialog>
+#include <QMenu>
+#include <QSplitter>
+#include <QStatusBar>
+#include <QString>
+#include <QTabWidget>
+#include <QTextEdit>
+#include <QToolBar>
+#include <QToolButton>
+
+#include <valijson/adapters/qtjson_adapter.hpp>
+#include <valijson/schema.hpp>
+#include <valijson/schema_parser.hpp>
+#include <valijson/validation_results.hpp>
+#include <valijson/validator.hpp>
+
+#include "highlighter.h"
+#include "window.h"
+
+Window::Window(QWidget * parent)
+  : QMainWindow(parent)
+  , m_schema(nullptr)
+{
+    setWindowTitle("JSON Inspector");
+
+    m_documentEditor = createEditor(false);
+    m_schemaEditor = createEditor(false);
+    m_errors = createEditor(true);
+
+    auto documentTabWidget = createTabWidget(m_documentEditor, "Document");
+    auto schemaTabWidget = createTabWidget(m_schemaEditor, "Schema");
+    auto horizontalSplitter = createSplitter(schemaTabWidget, documentTabWidget, true);
+
+    auto errorsTabWidget = createTabWidget(m_errors, "Errors");
+    auto verticalSplitter = createSplitter(horizontalSplitter, errorsTabWidget, false);
+    verticalSplitter->setStretchFactor(0, 2);
+    verticalSplitter->setStretchFactor(1, 1);
+
+    auto toolBar = createToolBar();
+    auto statusBar = createStatusBar();
+
+    addToolBar(toolBar);
+    setCentralWidget(verticalSplitter);
+    setStatusBar(statusBar);
+
+    connect(m_documentEditor, SIGNAL(textChanged()), this, SLOT(refreshDocumentJson()));
+    connect(m_schemaEditor, SIGNAL(textChanged()), this, SLOT(refreshSchemaJson()));
+}
+
+QTextEdit * Window::createEditor(bool readOnly)
+{
+    QFont font;
+    font.setFamily("Courier");
+    font.setFixedPitch(true);
+    font.setPointSize(12);
+
+    auto editor = new QTextEdit();
+    editor->setFont(font);
+    editor->setReadOnly(readOnly);
+
+    auto highlighter = new Highlighter(editor->document());
+
+    return editor;
+}
+
+QSplitter * Window::createSplitter(QWidget * left, QWidget * right, bool horizontal)
+{
+    auto splitter = new QSplitter(horizontal ? Qt::Horizontal : Qt::Vertical);
+    splitter->setChildrenCollapsible(false);
+    splitter->insertWidget(0, left);
+    splitter->insertWidget(1, right);
+
+    return splitter;
+}
+
+QStatusBar * Window::createStatusBar()
+{
+    return new QStatusBar();
+}
+
+QTabWidget * Window::createTabWidget(QWidget * child, const QString & name)
+{
+    auto tabWidget = new QTabWidget();
+    tabWidget->addTab(child, name);
+    tabWidget->setDocumentMode(true);
+
+    return tabWidget;
+}
+
+QToolBar * Window::createToolBar()
+{
+    auto toolbar = new QToolBar();
+    toolbar->setMovable(false);
+
+    auto openMenu = new QMenu("Open");
+    auto openSchemaAction = openMenu->addAction("Open Schema...");
+    auto openDocumentAction = openMenu->addAction("Open Document...");
+
+    auto openButton = new QToolButton();
+    openButton->setMenu(openMenu);
+    openButton->setPopupMode(QToolButton::MenuButtonPopup);
+    openButton->setText("Open");
+    openButton->setToolButtonStyle(Qt::ToolButtonTextOnly);
+    toolbar->addWidget(openButton);
+
+    connect(openButton, &QToolButton::clicked, openButton, &QToolButton::showMenu);
+    connect(openDocumentAction, SIGNAL(triggered()), this, SLOT(showOpenDocumentDialog()));
+    connect(openSchemaAction, SIGNAL(triggered()), this, SLOT(showOpenSchemaDialog()));
+
+    return toolbar;
+}
+
+void Window::refreshDocumentJson()
+{
+    QJsonParseError error;
+    m_document = QJsonDocument::fromJson(m_documentEditor->toPlainText().toUtf8(), &error);
+    if (m_document.isNull()) {
+        m_errors->setText(error.errorString());
+        return;
+    }
+
+    if (m_schema) {
+        validate();
+    } else {
+        m_errors->setText("");
+    }
+}
+
+void Window::refreshSchemaJson()
+{
+    QJsonParseError error;
+    auto schemaDoc = QJsonDocument::fromJson(m_schemaEditor->toPlainText().toUtf8(), &error);
+    if (schemaDoc.isNull()) {
+        m_errors->setText(error.errorString());
+        return;
+    }
+
+    try {
+        valijson::adapters::QtJsonAdapter adapter(schemaDoc.object());
+        valijson::SchemaParser parser;
+        delete m_schema;
+        m_schema = new valijson::Schema();
+        parser.populateSchema(adapter, *m_schema);
+        m_errors->setText("");
+
+    } catch (std::runtime_error error) {
+        delete m_schema;
+        m_schema = nullptr;
+        m_errors->setText(error.what());
+    }
+
+    validate();
+}
+
+void Window::showOpenDocumentDialog()
+{
+    const QString fileName = QFileDialog::getOpenFileName(this, "Open Document", QString(), QString("*.json"));
+    if (!fileName.isEmpty()) {
+        QFile file(fileName);
+        file.open(QFile::ReadOnly | QFile::Text);
+        m_documentEditor->setText(file.readAll());
+    }
+}
+
+void Window::showOpenSchemaDialog()
+{
+    const QString fileName = QFileDialog::getOpenFileName(this, "Open Schema", QString(), QString("*.json"));
+    if (!fileName.isEmpty()) {
+        QFile file(fileName);
+        file.open(QFile::ReadOnly | QFile::Text);
+        m_schemaEditor->setText(file.readAll());
+    }
+}
+
+void Window::validate()
+{
+    valijson::ValidationResults results;
+    valijson::Validator validator;
+    valijson::adapters::QtJsonAdapter adapter(m_document.object());
+
+    if (validator.validate(*m_schema, adapter, &results)) {
+        m_errors->setText("Document is valid.");
+        return;
+    }
+
+    valijson::ValidationResults::Error error;
+    unsigned int errorNum = 1;
+    std::stringstream ss;
+    while (results.popError(error)) {
+        std::string context;
+        for (auto itr = error.context.begin(); itr != error.context.end(); itr++) {
+            context += *itr;
+        }
+
+        ss << "Error #" << errorNum << std::endl
+            << "  context: " << context << std::endl
+            << "  desc:    " << error.description << std::endl;
+        ++errorNum;
+    }
+
+    m_errors->setText(QString::fromStdString(ss.str()));
+}
\ No newline at end of file
diff --git a/inspector/src/window.h b/inspector/src/window.h
new file mode 100644
index 0000000..5315126
--- /dev/null
+++ b/inspector/src/window.h
@@ -0,0 +1,48 @@
+#pragma once
+
+#include <QJsonDocument>
+#include <QMainWindow>
+
+class QJsonDocument;
+class QSplitter;
+class QStatusBar;
+class QTabWidget;
+class QTextEdit;
+class QToolBar;
+
+namespace valijson {
+    class Schema;
+}
+
+class Window : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    Window(QWidget * parent = 0);
+
+public slots:
+    void refreshDocumentJson();
+    void refreshSchemaJson();
+
+    void showOpenDocumentDialog();
+    void showOpenSchemaDialog();
+
+private:
+    QTextEdit * createEditor(bool readOnly);
+    QSplitter * createSplitter(QWidget * left, QWidget * right, bool horizontal);
+    QStatusBar * createStatusBar();
+    QTabWidget * createTabWidget(QWidget * child, const QString & name);
+    QToolBar * createToolBar();
+
+    void validate();
+
+    QTextEdit * m_documentEditor;
+    QTextEdit * m_schemaEditor;
+
+    QTextEdit * m_errors;
+
+    QJsonDocument m_document;
+
+    valijson::Schema * m_schema;
+};