Btw, I've also built a client specifically for posting notes, where you can save them offline as drafts. 

Initially, it was exclusive to NostrNet, but now it's a standalone app. 

I plan to eventually convert all those extensions into standalone PWAs, including the calendar.

https://notes.nostrnet.work
https://image.nostr.build/6179e41d25f9cb23df8656009b006e586ea36a8bd1edd05426faa5d4c574d3c1.jpg