Quiet
A private messenger for a small group of friends. Your browser encrypts messages before they leave, and the server passes them on and stores them without being able to read them.
Accounts
You need an invite code to join. Your password never leaves your device: it's turned into one secret that proves who you are, and another that unlocks your private key.
If you forget your password, your recovery key is the only way back. Nobody else can reset it for you, not even an admin.
Private messages
Only you and the other person can read them. The server stores them as encrypted data so that they can reach someone who's offline, and deletes them after 30 days. It can see who wrote to whom, when, and roughly how much, but not what.
To be certain nobody swapped your keys, open someone's profile and compare your safety codes on a call or in person. This device also warns you if someone's key ever changes.
Rooms
Group chats with their own password. Nothing is stored: messages exist only in the open tabs of the people in the room, and disappear when you leave or reload. The first person in a room sets its password.
What isn't protected
Your name, description, picture and banner aren't encrypted. Everyone with an account here can see them, and so can the server.
If someone recorded your encrypted traffic and later got hold of your password or a room's password, they could decrypt it. Use long passwords.
You have to trust the server. It delivers this page, so a hostile operator could change the code and read your password. If you need to defend against that, use an app you install, such as Signal.