About Desktop Commercial Licence



  • Hello dear all,

    I wanna write a desktop app which communicates with a PCB board. The PCB will be a commercial product. But, I wanna give the desktop app freely.

    I have a few questions.

    1-) Do I need to buy a commercial licence for this desktop app?
    2-) If the 1 is necessary, I wanna start with open-source qt and switch to commercial version when the project growth. Is it possible?
    3-) How the Qt company determines if the app is written with commercial version of Qt? Because, dynamic linking is possible also for open source version.

    Thanks.

    **Please do not give LGPL page links, I do not understand that damn papers.
    **Please do not give advice like "write to Qt directly". I have written 2 days ago but there is no response yet.


  • Moderators

    @biomed12 said in About Desktop Commercial Licence:

    1-) Do I need to buy a commercial licence for this desktop app?

    If you do make any changes to the Qt source code nor statically link against Qt, you can develop with the open source license (LGPL).
    So use the unmodified Qt dlls/libs and you are good to go

    2-) If the 1 is necessary, I wanna start with open-source qt and switch to commercial version when the project growth. Is it possible?

    Thats sometimes hard to prove when development really starts, but they do want you to take the full license already in development phase.



  • @raven-worx

    No, The application just will be simple application for some simple task. Also, I will not chance any source code of QT, I will use as it is.

    Thanks for reply.


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