Just wanted to also drop a recommendation for soulver, but I have been split between it and Calca (http://calca.io/) which I think is _also_ worth checking out, if you like this kind of hybrid notes/calculator like interface.

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.

Love Soulver and Calca looks great too, thanks for pointing that out! Personally I would love a tool like one of those but with built in unit handling/dimensional analysis capabilities equal or better to the Google search bar...

Calca does look like a really nice mix of note-taking and calculations. The screenshots made me realise I was missing variables in Soulver... until I looked at the Soulver docs and realised that it does have variables, I just hadn't thought to look. Thanks for the prompt!

A big plus for Calca is the mobile app and automatic syncing via iCloud on Apple devices.

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.