There are several that I've been using / trying out:

• Notion
  • used to be good, but it's becoming more and more bloated, and nowadays those AI command options seem to be cluttering the quick commands.
  • It is freemium, and syncs with their servers.
  • It has a really good table creation system, and the keyboard navigation flows really well.
  • I stopped using it since it's becoming slower and bloated, and migrated my language notes to Obsidian.
• Obsidian
  • is very capable (except that it doesn't a good WYSIWYG table creation / adjustment system),
  • it has tons of community plugins, very fast, lightweight, and customizable.
  • Completely free, but it does take some tinkering, and some parts do look kinda awful.
  • If you've been taking long notes with markdown, then Obsidian will probably suit you.
  • I have all my language notes written in Obsidian and synced to Github with a plugin.
• Anytype
  • is the latest one I'm trying out. Still in alpha, version 0.32
  • It is clunky at times, because the keyboard navigation is not well implemented, you still need to rely on mouse to select some sections.
  • But it has a really interesting type / relation definition system, where you define an object type, e.g. Movie, and you can define templates, relation to other objects (e.g. relation to Directors, etc).
  • I'm currently using it to plan my games / streaming backlog, it has a good table and data view system.

I believe all 3 of them have android apps.