"Slint employee here -..." <- > <@aurindam:matrix.org> Slint employee here - > The startup and individual license is 5€/month and 1 device royalty (MCU) is 0.90€ > > https://slint.dev/pricing But in your case, I believe the GPL should be also OK. I assume that the device on which the display runs is not being distributed (since its installed in your own spa), the software stack remains inhouse and you don’t need to provide source code. So you should be able to use Slint for free in this case.