Mynah is a private chat app with no phone-number field. Messages, photos, voice notes and calls are encrypted in the browser with Web Crypto (ECDH + AES-GCM) before they leave your device; the server only ever relays ciphertext, and only for 24 hours. History lives on your device. Chat rooms derive their key from the room code, so people can join without signing up, and the room deletes itself afterwards. Calls run peer-to-peer over WebRTC.