Android Superlist A good looking to-do app with support for notes, inline images, and collaboration features with a generous free plan or $10/mo for Pro plan.
Android myReach Definitely worth checking out, a ton of functionality, great support, apps for different platforms, and a useful AI tool to summarize your notes or help you write, but no Markdown input.
Android Nimbus Supports Markdown, linking of notes, versioning of notes, great table of contents, lots of online help, inline drawings and images, sharing a public link to a note, notifications, and filtering.
Android Inkdrop Github-flavoured Markdown, status per note, end-to-end encryption, revision history, and over 100 plugins! This is amazing for an app costing only USD 4.99 a month
Android Supernotes Well-designed cosmetically and fast, supporting Markdown, linking of notes, inline images, and apps for every platform you need including Linux.
Android Workflowy A powerful and freemium outliner that is not local-first but is very fast with apps for every platform you'd need, amazing filtering abilities, and you can get your notes out at any time.