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Using a Dual Licensing licensing model, Qt products are available under commercial licenses for proprietary development and under the GPL for free and open source development.

  Open source Commercial
Develop open source applications

Qt is available under the GPL (General Public License)
for open source development. Applications built with the
Open Source version of Qt are subject to the terms of the
GPL, as are any applications built with it.
Get access to complete Qt source code

Complete source code is available with both Open
Source and Commercial evaluation versions of Qt.
Develop proprietary/closed source applications

Choosing the Qt commercial license secures you
the right to develop, use and distribute your
application under flexible commercial licensing terms.
Visual Studio integration and Commercial database drivers

The Commercial License provides you with access to
Qt’s integration with Microsoft Visual Studio, plus the
drivers to access Oracle, DB2 and Sybase databases
from a Qt-based application.
Access to Qt Software technical support

All commercial license holders are granted access
to Qt Software’s support and maintenance program
while their license is active.
Flexible licensing terms for your application

Open Source version of Qt are subject to the terms of the
GPL (General Public License), as are any applications buit
with it.  If you want to be free to choose other licenses,
including commercial licensing, choose a commercial evaluation.
 

 

 

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Qt is a cross-platform application framework. Using Qt, you can write applications and user interfaces once, and deploy them across many desktop and embedded operating systems, without rewriting the source code.

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