@RusaPen I think you're looking for https://fpc.ink by @ujh It will let you catalog your inks (you can't upload your own swatches, though), pens, and track what ink is in which pen. Perfectly fine if all you want to do is keep a list of inks.

@edebill @ujh oooh I've seen this! It's definitely really close. The only problem is that I have so many inks, I sometimes accidentally buy one that's very similar to what I already have. That's why the swatches would be important. 😩 If only I was smart enough to code lol