Hi. Basically, I'm asking for suggestions. Do you know any good note taking app that works on linux desktop? I'm looking for something that I can use instead of Notion or Obsidian, with some nice to have:

• Open source (that's the reason I'm not that much into Obsidian, it could disappear tomorrow and I could not replace it with a community maintained fork)
• Markdown based. I'd like to know that I can replace that app for another one when I want, and that's not possible when they use their own obscure format
• Local. I'm not interested in paying monthly for cloud storage. And actually, I'd prefer to know for certain that nothing leaves my local machine
• Nice UX. I know that using plain text files and vim might do the job, but I'd like something more user friendly and with nice features (Notion, for example, nails it in my opinion)
• Bonus: Can also be used on android (I'm aware this is a though one, and is not a deal breaker)

I know that all those requirements are hard to fulfill and I don't even know if something like that exists, so I'd appreciate any kind of suggestion. For example, It'd be great if an open source like that exists, but I'm not completely closed to open-source-ish proprietary apps (e.g. licenses not really open but close enough), as long as they are free to use and work on linux.

Edit: Thanks for the suggestions, everyone. The most suggested alternative was Joplin so I'll give it a try. However, as most of you mentioned, at the core it's all markdown so I could easily try the other alternatives with the same knowledge base at a later point :)