The new WhatsApp multi-device architecture removes these hurdles, no longer requiring a smartphone to be the source of truth while still keeping user data seamlessly and securely synchronized and private. It also allows for only a single companion device to be operative at a time, meaning people can’t be on a call in Portal while checking their messages on their PC, for example. However, it comes with some significant reliability trade-offs: By requiring the phone to perform all operations, companion devices are slower and frequently get disconnected - especially when the phone has a poor connection, its battery is running low, or the application process gets killed by the phone’s OS. This architecture makes it easy to deliver a seamlessly synchronized experience between a phone and companion device without compromising on security. Companion devices maintain a persistent secure connection with the phone and simply mirror its contents on their own UI. The current WhatsApp experience for companion devices on web, macOS, Windows, and Portal uses a smartphone app as the primary device, making the phone the source of truth for all user data and the only device capable of end-to-end encrypting messages for another user, initiating calls, etc. To achieve this, we had to rethink WhatsApp’s architecture and design new systems to enable a standalone multi-device experience while preserving privacy and end-to-end encryption. Importantly, we have developed new technologies to maintain end-to-end encryption while still managing to sync your data - such as contact names, chat archives, starred messages, and more - across devices. Each companion device will connect to your WhatsApp independently while maintaining the same level of privacy and security through end-to-end encryption that people who use WhatsApp have come to expect. ![]() With this new capability, you can now use WhatsApp on your phone and up to four other nonphone devices simultaneously - even if your phone battery is dead. ![]() Today, we’re announcing the rollout of a limited public beta test for WhatsApp’s updated multi-device capability. For years, people have been asking us to create a true multi-device experience that allows people to use WhatsApp on other devices without requiring a smartphone connection.
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