I love a cohesive theme for my laptop, and when you have many different apps that you work with on the day to day (Slack, terminal, text editor, and so on) it can be frustrating and time consuming to create that cohesive theme experience.
I've also been meaning to try out making my own colorscheme for Vim, but have been frozen a few times with "where to begin paralysis".
I used the web version because setting up a colour palette is a new task for me and I enjoyed the visual interface, although I could have substituted the experience with another visual tool. I found it to be a good introduction to potentially using the command line themer tool in the future.
All in all this tool saved me hours of time that would have been spent editing a vim colorscheme, generated matching wallpapers and other editor themes for me, and produced readable code that allowed me to make some really easy tweaks to said vim colorscheme, so I thought I'd share in case you are also interested in making your own theme(s) but are uncertain of where to start.