Based off of Qt's comparison between their commercial and open source licenses, you would only absolutely need the commercial license if you were making modific

Based off of Qt's comparison between their commercial and open source licenses, you would only absolutely need the commercial license if you were making modifications to Qt itself instead of linking to the shared libraries. Even in that case you could simply publish your Qt modifications as GPL seperetly. https://www.qt.io/download https://www.qt.io/download