Tl dr: webapps have a way higher attack surface, that's why Signal Desktop is deliberately separate and it is unlikely that there ever will be a Signal webapp. The worlds leader for customer messaging including mobile push notifications, web push, SMS, email & in-app messaging. Also, a browser could have cross-site attacks that would not be possible in Signal Desktop, as there are no other pages, so it would have to be an attack from within Signal's code. The desktop app can just hardcode the authentication certificates of the update routine to detect if someone tries to sneak in a malicious update, in a Browser this is not really possible. Things like this have been pulled off even for TLS-encrypted websites, although rarely and typically not by your neighbor. How to use Signal messenger app - Signal is a privacy focused messenger app like WhatsApp or Telegram but with a heavy focus of privacy features like disappearing messages, end-to-end. A web app gets served anew every time you open it, and as a consequence has a way larger attack surface, as someone could try to man-in-the-middle the website that's delivered. Signals web-based threat intelligence platform delivers critical information from surface, deep, and dark web scans for increased situational awareness. It only occasionally pulls an update from a trusted source and works standalone. The technology behind it is the same with which you can build a web-client, that is true, but there is one significant difference, because of which there is no web client: The desktop app is standalone and always serves this very application. Make crystal-clear voice and video calls to people who live across. I think Signal's desktop app is web based anyways. Signal uses your phones data connection so you can avoid SMS and MMS fees.
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