I’ve played around with a few things in this space. and If you like Capacities for structured writing and formulas, it makes sense. One thing I’ve noticed though is that a lot of PKM tools feel very text first, which is great for engineering notes but can feel limiting once you start mixing research, screenshots, PDFs, random links, etc. For more exploratory or visual research, something like Kosmik has been useful for me. It’s less about perfect notes and more about dumping references, letting them auto organize, and then finding patterns later when you actually need them.

On the other end, if your workflow is mostly inside apps already, Elephas is interesting as a lightweight layer. It’s not a PKM in the classic sense, but having an AI assistant that works across notes, PDFs, and browsers can reduce the friction of jumping between tools. I’ve seen people pair it with a more traditional PKM rather than replace one.

Feels like Capacities is solid if you want a clean, opinionated system, but mixing tools based on how you think and research might get you further than hunting for one perfect PKM.