NostrNet.work notes extension, allows you to draft a note offline, and you can publish it later. It has a lot of rough edges right now, but I will improve it soon.

In a few days, whatever you post using this app will be broadcasted to all the existing relays, giving you the best discoverability possible.

IOS: https://notes.nostrnet.work/
https://image.nostr.build/299a66bfbe477ba21ddfd4ecab923517f4a1ceaa373adaadb094479790d2f60f.jpg