GammaRay is a tool to poke around in a Qt-application and also to manipulate the application to some extent.
C++ CMake QML GLSL Shell C
Latest commit 1f95312 Aug 26, 2016 @dfaure-kdab dfaure-kdab toolchains: use CMAKE_CXX_FLAGS rather than CMAKE_CXX_COMPILER_ARG1
The latter breaks when $CXX="ccache gcc", it replaces "gcc" instead of
adding -m32.
Failed to load latest commit information.
3rdparty Merge remote-tracking branch 'github/2.5' Aug 3, 2016
app Fix coding style Jun 22, 2016
client Fix compilation on ARM when building against Qt 4 Aug 23, 2016
cmake toolchains: use CMAKE_CXX_FLAGS rather than CMAKE_CXX_COMPILER_ARG1 Aug 26, 2016
common objectidfilterproxymodel.h - fix include guard Aug 23, 2016
compat Reduce memory allocation and string conversion. Mar 7, 2016
core Code cleanup Aug 19, 2016
docs docs/CMakeLists.txt - minor improvement to status message Aug 24, 2016
examples Fix QNX 6.6 build Aug 15, 2016
inprocessui Use generator expressions to get pdb names Jul 18, 2016
launcher add a trademarked GammaRay image to the About pages Aug 23, 2016
plugins normalize SIGNALs/SLOTs Aug 23, 2016
probe Use generator expressions to get pdb names Jul 18, 2016
resources add a trademarked GammaRay image to the About pages Aug 23, 2016
tests Fix highdpi issue in quickinspectortest Aug 19, 2016
translations Update translations for upcoming 2.6 release Aug 19, 2016
ui ui/helpcontroller.cpp - better search for "assistant" with QLibraryInfo Aug 24, 2016
.emacs-dirvars For us XEmacs people Sep 22, 2011
.gitignore Extract messages from JSON plug-in meta data for translation. Jun 18, 2016
.kateconfig Prefer Qt coding style for new code. May 15, 2016
.krazy ECMFindModuleHelpers.cmake - insert full license text, as required. Aug 23, 2016
CHANGES Add 2.6.0 changelog Aug 19, 2016
CMakeLists.txt Bump version for 2.7 development in master Aug 23, 2016
GammaRay.appdata.xml GammaRay.appdata.xml - update as requested by AppStream folks Aug 11, 2016
GammaRay.desktop GammaRay.desktop - add keywords Jan 8, 2016 Propagate build options to external plugins as well. Jul 14, 2016
Install.txt Install.txt - a little more detail for MSVC and MinGW builds Jul 18, 2016
LICENSE.BSD3.txt cmake/ - insert full BSD-3 license text, add LICENSE.BSD3.txt Jun 4, 2016
LICENSE.GPL.txt update copyright year 2016 Jan 2, 2016
LICENSE.US.txt Update ReadMe's and License files for GPL and commercial variants. May 11, 2015
LICENSE.txt update copyright year Jan 3, 2016
ReadMe-commercial.txt improve the trademark statement Jun 4, 2016 - make it a symlink to Readme.txt again May 11, 2015
ReadMe.txt improve the trademark statement Jun 4, 2016 Add CC-BY-SA license for the docs. Jun 2, 2016
config-gammaray-version.h.cmake second half of rename commit - sorry for the early push :( Sep 22, 2011
config-gammaray.h.cmake Initialize Path::rootPath based on our DLL location Jul 14, 2016
debian.changelog prep for the 2.5.1 release Jul 27, 2016
debian.control OBS packagefiles - no longer need graphviz Aug 6, 2016
debian.rules merge from 1.2 branch Jun 28, 2012
format.config.uncrustify.4_spaces Tweak uncrustify config a more to match Qt style Jun 22, 2016
format_sources Add uncrustify coding style template Jun 22, 2016
gammaray-qt4-debian.control Qt4 packagefiles - no longer needs graphviz Aug 6, 2016
gammaray-qt4.dsc Qt4 packagefiles - no longer needs graphviz Aug 6, 2016
gammaray-qt4.spec prep for the 2.5.1 release Jul 27, 2016
gammaray.dsc OBS packagefiles - no longer need graphviz Aug 6, 2016
gammaray.spec OBS packagefiles - no longer need graphviz Aug 6, 2016



GammaRay is a software introspection tool for Qt applications developed by KDAB. Leveraging the QObject introspection mechanism it allows you to observe and manipulate your application at runtime. This works both locally on your workstation and remotely on an embedded target.

Augmenting your instruction-level debugger, GammaRay allows you to work on a much higher level, with the same concepts as the frameworks you use. This is especially useful for the more complex Qt frameworks such as model/view, state machines or scene graphs.

Among other things GammaRay can:

  • Browse the QObject tree with live updates.
  • View and edit object properties.
  • View and invoke slots of a QObject, and monitor its signals.
  • List all QObject inbound and outbound signal/slot connections.
  • Provide a layout information overlay for QWidget and QtQuick2 applications.
  • Inspect all QPainter operations used to draw a specific widget.
  • Browse the QtQuick2 item tree and scenegraph.
  • Inspect shaders and geometry data of QtQuick2 items.
  • Plot object lifetime and emitted signals.
  • Browse the QAbstractProxyModel hierarchy and inspect intermediate results in a proxy model chain.
  • Visual live inspection of QStateMachines.
  • Browse the item tree of any QGraphicsView scene.
  • Show a live preview of QGraphicsView items, including showing their coordinate system, transformation origin, rotate/zoom/pan, etc.
  • Intercept translations and change them at runtime.
  • Inspect all building blocks of a QStyle.
  • Show all QTimers and their statistics (number of wakeups, wakeup time, ...)
  • Browse all QTextDocuments, along with the ability to edit them and view their internal structures.
  • Act as a complete java script debugger, attachable to any QScriptEngine (including the usually not accessible one used by QtQuick1 internally).
  • Perform HTML/CSS/DOM/JS introspection/editing/profiling on any QWebPage, thanks to QWebInspector.
  • Browse the QResource tree and its content.
  • Show all registered meta types.
  • Show all installed fonts.
  • Show all available codecs.


Get Involved

If you want to contribute, please check out:

KDAB will happily accept external contributions, but substantial contributions will require a signed Copyright Assignment Agreement. Contact for more information.


The GammaRay Software is (C) 2010-2016 Klarälvdalens Datakonsult AB (KDAB), and is available under the terms of the GPL version 2 (or any later version, at your option). See LICENSE.GPL.txt for license details.

Commercial use is also permitted as described in ReadMe-commercial.txt.

About KDAB

GammaRay is supported and maintained by Klarälvdalens Datakonsult AB (KDAB).

KDAB, the Qt experts, provide consulting and mentoring for developing Qt applications from scratch and in porting from all popular and legacy frameworks to Qt. We continue to help develop parts of Qt and are one of the major contributors to the Qt Project. We can give advanced or standard trainings anywhere around the globe.

If you would like to have a custom plugin for GammaRay to visualize, profile or debug your own specific components or applications, get in touch with us via KDAB engineers have a lot of experience writing GammaRay plugins and can be contracted to help you get yours working and improve your development efficiency.

GammaRay and the GammaRay logo are registered trademarks of Klarälvdalens Datakonsult AB in the European Union, the United States and/or other countries. Other product and company names and logos may be trademarks or registered trademarks of their respective companies.