Not sure what you mean by html based. Do you mean web based?
Does this fit your needs?
https://github.com/PrivateBin/PrivateBin
post
replies:
I developed https://e2epaste.xyz/ a while back that is capable of this.
You can set the number of views, after which the paste is permanently deleted. It's fully end to end encrypted, and the server has no way of knowing the contents of pastes.
replies:
I think CryptPad has delete-after-view.
Edit: yes, it has
I know you mentioned Nextcloud and if you happen to already be running it you can use the add-on/module/whatever called Secrets, its exactly what you describe. You make note, send link (can password protect if you want) and once its been viewed its gone.
If you don't already have Nextcloud, check out vaultwarden's (bitwarden) send feature.
I think I've seen some things like that, but you can never stop them from taking a screen shot, with a camera if necessary.
Not seen anything quite like that to be honest, but I do have a service running a pretty decent chat room system that doesn't keep any data after the room is nuked. Not quite the same I know... but it works well for me!
all 9 comments