That being said, there are free alternatives like Obsidian that are really great. Sync with your favorite cloud provider you are already paying for. Sync with Git. Lots of plugins.
Obsidian is not open source. Its free for offline use, but thats about it.
I just love Notable due to it's simplicity and performance. The UI looks just right, every note can have it's own tab, there are no themes for now (apart from light and dark one), but they are nice and contrasty, the keyboard shortcuts are just right, the app is fast and responsive. I don't need anything more. Fabio (the author) knows whats he's doing and I like that he respects his users. Obsidian is more like: lets throw everything we can think of in, damned the performance, UI, or usability. The only good thing I can say is that I've managed to get both of them to play well together in iCloud Drive (or any "cloud" drive would be fine). So on my computers I use Notable, and on mobile devices I have Obsidian to edit the same notes.
Didn't find it bloated at all as it contains mostly functionality directly related to notes. The ability to support community driven JS plug-ins is just icing on the cake and search is blazing fast. I've got 10,000 notes in there and I can search through all of them using full and partial text search in less than a second.
Fascinating how we had such a completely different user experience.
Although it's not as much an editor as an outliner; notes are strongly hierarchical, and it's difficult to use for writing plain markdown files. But that shouldn't be a problem if your main need is note-taking.
"You need to pay for Obsidian if and only if you use it for revenue-generating, work-related activities in a company that has two or more people."
Not sure how to read that if you are, let's say, a freelancer. My guess is you are a one-man "company" and the other company is your customer?
But practically speaking, if you have an employment contract or have employees and any of your notes are work related you are supposed to pay for obsidian.