To be honest, I haven't paid much attention to mobile - mostly because I am nearly always on a desktop. Obviously a large screen is better when you are making changes to a big story map, but I get your point. Thanks for the detailed feedback, it really means a lot to me.
Thanks! I know that Featmap is not unique in the space, there are a lot of similar products. What I was missing was a free and open sourced tool with just the right feature set. After a couple of months of ambivalence, I decided to scratch my own itch. Would love to get your feedback once you've tried it.
My idea is that the tool can be used to quickly communicate product vision and current progress to the team or external stake holders. I can also imagine teams using it as their primary tracking tool, if the company is small enough. If you end up using it, please let me know how I can improve it and how you are using it.
Trello is often good enough. With Featmap, I wanted to create the user story mapping tool that is juuust perfect for my use cases. Hopefully, other people will also find it useful!