Not yet, it still lives only on my computer, but the designs are still meh or in best case utilitarian. I've started to build this product for exact reason you mentioned: finally build something substaintial with Vue, learn how to work with Webpacker (and other Rails 6 features) and build Flutter app (yet to be done).
I am going to do big rewrite of my saas app this year, this is my attempt to learn couple of new technologies to see if they are fit for me and as a place to make mistakes before coding something I care about.