> Honestly, it just tries to be a free Soulver alternative in your browser.
For people on macOS, Soulver is excellent and worth checking out: https://soulver.app . I almost always have a Soulver window open on my screen.
The ultimate interface _for me_ would be somewhere in between Calca (which I think has superior support for functions/graphing/logical calculations) and Soulver (which I think has better usability/readability) and a graph-based note-taking system like Obsidian/Zettlr. I'm sure somebody will say "there is a Vim plugin that'll do that" but… yea.
Not sure if Soulver is newer or less “complete” than Calca, but it is being updated at lot more often. The updates for Calca are very sparse and leads me to think it’s more in a maintenance mode.