Coda is the better alternative, pretty much on the same level, but with a different focus and polished at other parts I would say.

Appflowy (open source) might become some day an alternative, but it's still in development, and somewhat lacking. I would give it another 1-2 years.

There are also many other direct alternatives, in the sense to be a 1:1 clone, like Microsofts Loop or Zenkit Hypernotes(?), and a bunch of Open Source-Projects, but they all are very early in their development, or just lacking here an there, so I would more call them future alternatives.

Have a look at FSNotes, I use it on Mac and iOS and it works well for me, I previously used notational velocity and loved it, have also a liking for Joplin but it doesn’t synch as easily as I would like, FSNotes does all really well! I tried Notion, it was not for me in so many ways!

I've started using Trilium notes and so far it's decent. Haven't used notion much though, it's very possible power users will miss many features - i'm just casually taking notes in it. love having a self-hosted sync server, and it also comes with a decent "export to text files" option in case i want to switch again.

Maybe obsidian.md?