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Per their description "A simple and private notes app."
Open source encrypted note application. Nothing similar currently available via PortableApps.
I'm about halfway done right now. Keep your eyes open.
Check out Joplin in the meantime. Very similar. https://github.com/laurent22/joplin
Try it out.
Wow, that was fast. If it was this easy I would have turned it into a PortableApp myself.
Moved comment to: https://portableapps.com/node/63191