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Obsidian App Only Lets You Manage Notes Offline, Here is the Solution
Pair it with Dropbox
If you love taking note, you’ll definitely fall in love with Obsidian.
Designed to be your knowledge base (or a second brain, according to its official homepage), Obsidian will handles your notes (which are plain texts in markdown format) and lets you make connection between those notes.
Since the notes are in markdown files, you don’t have to open the app to create a new note. Just use any editor you like and save it in .md extension.
And because it is markdown (or plain text), the app runs very fast.
Still, there is one catch: it only works with the offline files.

While they argued that local storage is the unique feat of the app, at the time of this writing, they are developing its mobile app, which is surprisingly, offers synchronization, but then is limited to the supporter (people who donate their money to support the program — not surprisingly, though):