Hey! I have been using many note managers for years: Onenote, Workflowy, Notion... but none of them were perfect for me.
That's why I made Fluski. Some of its characteristics are an infinite outline of pages, and that all blocks are collapsible and expandable.
Coming soon bi-directional links, offline mode, databases, and much more!
If you find it interesting, I would love for you to try it and hear your feedback! - https://fluski.com.
Also, there is a short Demo video in the Product Hunt post: https://www.producthunt.com/products/fluski