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All I want is Notion with data privacy like Bear.

Exactly, something like Notion that keeps my data encrypted on my iCloud like Bear with native iOS and Mac app similar to Things3. I could easily pay 100 bucks for this kind of setup.

https://github.com/outline/outline

outline is pretty close, big drawback is that the only auth method is over slack

https://github.com/kjk/notionapi