How does Qt licensing work?
Qt for Application Development is dual-licensed under commercial and open source licenses. The commercial Qt license gives you the full rights to create and distribute software on your own terms without any open source license obligations. Qt tools and some libraries are only available under GPL.
Do I need a license for Qt?
Yes. You can install Qt and our development tools on five devices per designated users. Our licenses are per individual, so all members of your project team using Qt need to have a commercial license.
Will Qt stay free?
KDE develops Free, Open Source Software. Most of the KDE software uses the Qt library, which is available under compatible free licenses. The continued availability of Qt as Free Software is safeguarded by the KDE Free Qt Foundation, founded in 1998.
How much does a Qt license cost?
The Qt Small Business license has all the Qt features for mobile, desktop, and embedded development for 499 USD per year. What is so excellent about this offering is that you can distribute your applications to all our supported platforms (excluding MCUs, which is sold separately).
Is Qt going closed source?
‘There’ll be no more work from external/unpaid contributors’ – dev. The Qt Company has followed up on its plan to make long-term support releases commercial-only by closing the source for 5.15 today, earning protests from open-source contributors who say that the 6.0 release, which remains open, is not yet usable.
Can a Qt product be developed under a commercial license?
Products distributed under the commercial version of Qt must also be developed under the commercial version of Qt. If you have already started the development with an open-source version of Qt and wish to move to a commercial license you need to have a written explicit permission from The Qt Company to facilitate this change.
Do you need a license to use Qt WebEngine?
This module is available under commercial licensing terms and doesn’t introduce a dependency to LGPL licensed code. As a commercial license user, in practice, you only need to consider license obligations of LGPLv2.1, and only if you make use of Qt WebEngine or Qt WebKit .
Is the Qt Script licensed under the LGPL?
Usually, not. When using the commercially licensed version of Qt, we provide almost all of Qt under a commercial license terms. A few modules in Qt, however, use code from the WebKit project licensed under LGPLv2.1. These modules are Qt Script, Qt WebKit and Qt WebEngine.
Is it legal to use Qt with open source?
In case there is any doubt on whether the requirements of the open source licenses can be met in full, the commercial licensing option of Qt is often the best choice to avoid legal setbacks. We’re also happy to talk to you about your situation, but we aren’t in the position to provide any legal guidance.