Came here to say the same thing. Sorry to be “that guy” but it’s really hard for me to have any positive thoughts of a front-end web project when it’s website doesn’t work on mobile.
I don't know the motive for the site design, but I wonder if perhaps it wasn't coded for mobile because the app is not compatible with mobile devices but rather only Windows, Mac, and Linux.
Even if you’re making a CLI application the website still needs to work on mobile. Responsive design is the only web interface design that is relevant.
You couldn't just tick the "Request desktop site" box available in every browser? But yeah I guess you know enough already, the dev should apologize because the website of their free product is not mobile friendly.
I'm also a developer, and if you're not mobile-first let alone mobile friendly, you're doing it wrong in 2019. Why do I want to pan and scroll around a tiny site rendered in desktop mode on my mobile for your brand new product?
It's either lazy or ignorant and neither gives me confidence in their software.