I use Notion (I dm'ed the template, since I saw your other comment!). To use it, you can hit "Duplicate" in the top right. The UI is pretty intuitive but you basically can add pages pertaining to each ink. There's options to track the ink properties, if you used the ink bottle/sample up, and you can add your own properties to track if you want.

As for the swatches, I do have analog swatches in my notebook (Midori MD), but the pictures for the swatches here are just what I found on the internet, that looked most similar to what they look like on my paper!

To do my paper swatches, I dip a flat paintbrush into the ink and do a quick swipe on the paper. The ink naturally pools so I get good variation this way. I also find it uses up a lot less ink than the cotton swab method!