Qwt - Qt Widgets for Technical Applications

The Qwt library contains GUI Components and utility classes which are primarily useful for programs with a technical background. Beside a framework for 2D plots it provides scales, sliders, dials, compasses, thermometers, wheels and knobs to control or display values, arrays, or ranges of type double.



Qwt is distributed under the terms of the Qwt License, Version 1.0.


Qwt 6.1 might be usable in all environments where you find Qt. It is compatible with Qt4 ( >= 4.4 ) and Qt5.

What's new

Read the summary of the most important changes.



Stable releases or prereleases are available at the Qwt project page.

For getting a snapshot with all bugfixes for the latest 5.2 release:

svn checkout svn://svn.code.sf.net/p/qwt/code/branches/qwt-5.2

For getting a snapshot with all bugfixes for the latest 6.1 release:

svn checkout svn://svn.code.sf.net/p/qwt/code/branches/qwt-6.1

For getting a development snapshot from the SVN repository:

svn checkout svn://svn.code.sf.net/p/qwt/code/trunk/qwt


Qwt doesn't distribute binary packages, but today all major Linux distributors offer one. Note, that these packages often don't include the examples.

When no binary packages are available ( f.e. on Windows ) Qwt needs to be compiled and installed on the target system.


  • Mailing list
    For all kind of Qwt related questions use the Qwt mailing list.
    If you prefer newsgroups use the mail to news gateway of Gmane.
  • Forum
    Qt Centre is a great resource for Qt related questions. It has a sub forum, that is dedicated to Qwt related questions.
  • Individual support
    If you are looking for individual support, or need someone who implements your Qwt component/application contact suppo.nosp@m.rt@q.nosp@m.wt-pr.nosp@m.ojec.nosp@m.t.org. Sending requests to this address without a good reason for not using public support channels might be silently ignored.

Related Projects

QwtPolar, a polar plot widget.
QwtPlot3D, an OpenGL 3D plot widget.


Sourceforge offers a Donation System via PayPal. You can use it, if you like to support the development of Qwt.


Uwe Rathmann, Josef Wilgen ( <= Qwt 0.2 )
Project admin:
Uwe Rathmann <rathm.nosp@m.ann@.nosp@m.users.nosp@m..sou.nosp@m.rcefo.nosp@m.rge..nosp@m.net>