Obsidian Sync
Obsidian is a very popular, open source notes tool that manages everything directly on the file system leaving it open to many different syncing options.
Pairing Obsidian with a Proton Drive syncing option would create an excellent privacy focused notes solution. Obsidian has a plugin ecosystem that allows for additional functionality and by creating a Proton Drive sync option that could be utilized on both mobile and desktop applications you would simultaneously address a market need while expanding the scope of the drive offering to something on the level of a free office suite.
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Victor commented
> cant u like.... sync the vault folder?
You can. On a computer. On an iPhone, iPad and so on, it's pretty much impossible. This is why a Sync extension would be amazing.
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proton user commented
cant u like.... sync the vault folder?
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Anonymous commented
Obsidian is not open-source.