Obsidian is not FOSS, but you can switch to it for now because the whole idea is that it’s just a folder of markdown files. I recommend shopping around by pointing each app at the same markdown folder, so you can see your same notes without having to worry about complex migration. Being able to look at all your notes gives you a better idea of what will suit you.
Also, I recommend Pandoc for translating between document formats. It’s not not absolutely perfect, but it is wildly good at dealing with the complex problem of translating.
The simplest thing you can use, IMO, is Marktext. It’s basically Notepad for markdown – no file manager, no special features on top of the markdown syntax, etc. Beyond that you start getting into what features you want on top, at which point you really do just have to test them out for your use case.
As far as options go, you have basically two options as far as systems go:
A built-in sync in the program between the desktop and phone version of the same app (i.e. obsidian, Joplin)
Use a tool like syncthing for sync between devices, which allows you to use any app you want for actual note-taking, and allows you to use different apps on phone vs. desktop.
I do the latter, and use Zettlr on desktop (more document than note-centric) and Markor on android. The issue with the former is that a great desktop app might not have the best phone version. Also, the apps that do sync typically use an internal database that you can export as a folder of markdown files (i.e. Joplin), and don’t actually just look at a folder of files. This makes testing out different editors kinda hard, unfortunately.
The other wierd variable is that some apps are literally just a WYSIWYG markdown editor (Marktext, etc.), whereas most of them are markdown editors with Other Stuff On Top™ (Obsidian, Zettlr, LogSeq, etc.). Not all apps implement the same flavor of markdown (which can be maddening, but you can use pandoc to change markdown flavor), but if you rely on a specific app’s special flavor of garnish on top of markdown, it becomes harder to switch to another app in the future if you prefer its functionality or UI. Just something to keep in mind.
For me personally, one of the make or break traits is a good table creator. Making tables by hand in Markdown is a maddening, so having a GUI way to do it makes a huge difference if you end up needing to make a lot of tables. That is really hard to find because it is hard to automate Markdown table formatting in a foolproof way. As far as I know, the table plugin in Obsidian is the best way to do that by far at the moment. The Zettlr devs are working hard on rewriting theirs from scratch to be way more robust, but that is WIP.
tl;dr Just pick a Markdown editor, and you can shop from there as long as they store their files in a simple folder.
Obsidian is not FOSS, but you can switch to it for now because the whole idea is that it’s just a folder of markdown files. I recommend shopping around by pointing each app at the same markdown folder, so you can see your same notes without having to worry about complex migration. Being able to look at all your notes gives you a better idea of what will suit you.
Also, I recommend Pandoc for translating between document formats. It’s not not absolutely perfect, but it is wildly good at dealing with the complex problem of translating.
The simplest thing you can use, IMO, is Marktext. It’s basically Notepad for markdown – no file manager, no special features on top of the markdown syntax, etc. Beyond that you start getting into what features you want on top, at which point you really do just have to test them out for your use case.
As far as options go, you have basically two options as far as systems go:
The other wierd variable is that some apps are literally just a WYSIWYG markdown editor (Marktext, etc.), whereas most of them are markdown editors with Other Stuff On Top™ (Obsidian, Zettlr, LogSeq, etc.). Not all apps implement the same flavor of markdown (which can be maddening, but you can use pandoc to change markdown flavor), but if you rely on a specific app’s special flavor of garnish on top of markdown, it becomes harder to switch to another app in the future if you prefer its functionality or UI. Just something to keep in mind.
For me personally, one of the make or break traits is a good table creator. Making tables by hand in Markdown is a maddening, so having a GUI way to do it makes a huge difference if you end up needing to make a lot of tables. That is really hard to find because it is hard to automate Markdown table formatting in a foolproof way. As far as I know, the table plugin in Obsidian is the best way to do that by far at the moment. The Zettlr devs are working hard on rewriting theirs from scratch to be way more robust, but that is WIP.
tl;dr Just pick a Markdown editor, and you can shop from there as long as they store their files in a simple folder.