This is quite a competitive space now. It's also price competitive - with orgs like Notion offering free use to individuals. Interesting to see a different spin though - I'm not sure any similar services offer spaced repetition, for example. Good luck.

Good point! I'm still not sure that spaced repetition is done right. Some notes doesn't make sense to review at all. And the pacing is also the question.

do you have any insight on why this space is becoming so competitive?

Another pedant here: "I have recently wrote an article on learning and knowledge management, have a look" Clearly you are in a rush. But slow down a little and quash these terribilities.

Quick note, there's a typo in the first paragraph. "Writting good notes takes some experience"

thank you, will fix that