I would also suggest
- this isn't similar to a chat but is one of the few ways to exchange messages 100% anonymously.
You just write a message, encrypt it and get a link that can be shared. Once the link has been opened, the message "destroys" itself and the link gets invalid.
That's what they promise.
But in the end it is a centralized service hosted on a centralized server.
You are not encrypting anything with your / the recipients key.
This is neither safe / secure nor anonymous at all. They get access to your IP, browser, OS, screen resolution, etc..
Just because they SAY that they don't keep the data, you can never be sure.
You have to TRUST the people behind privnote.com to exactly do as they say.
If you TRULY wan't to securely communicate (encrypted), use signal. This is the de facto standard in encrypted and secure communication.
It is open source and has been audited by many security firms and private cyber security researcher.
If you additionally want to hide *any* kind of metadata (which is not as easy as it might sound), you NEED to route your whole traffic trough the tor network (which - by itself - is not enough to be completely anonymous).