Mlem is iOS only.

How is it different than OneNote, Evernote, or any one of the other hundreds of journal/note-taking apps?

Like this?: Reduce uninstalls for your app with auto-archive

This isn’t even talking about phones.

I’ve tried it, works great.

I wore one when the air quality was bad from the forest fires, otherwise I don’t. Don’t have a problem putting one on again if Covid or some other virus got bad again. But since it is summer here, wearing a mask makes me sweat to death