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Update (11/21/2023): Just a day after Nothing Chats went live on the Google Play Store, the company has taken down the app and says it will be "delaying the launch until further notice."
The decision comes not because of Apple's late-week decision to bring RCS to iPhones in 2024 but because of security and privacy concerns. Several sources, including 9To5Google and Texts.blog, have pointed out that messages, pictures, and videos exchanged on Nothing Chats, powered by Sunbird, were not end-to-end encrypted, unlike what the partnering companies had claimed.
Instead, messages were decrypted and transmitted using HTTP to a Firebase server (and error-reporting software, Sentry) in plain text. That information, which includes vCards (used to bundle contact information like phone numbers and email addresses) could easily be accessed, as discovered by Dylan Roussel.
What is Nothing Chats?
Depending on what part of the world you live in, the idea of blue bubbles versus green bubbles evokes either a feeling of confusion or frustration. If you're in the US, where the iPhone dominates the sales charts and iMessage arguably reigns supreme among texting services -- especially among teenagers, then you may be well acquainted with the drama that comes with Apple's exclusive messaging platform.
In short: Android users who text iPhone users appear as green bubbles instead of blue bubbles, and the lack of feature parity, including no typing indicators, Tap-Back support (reacting to messages with a tap-and-hold), and group chat limitations, means that the experience of using iMessage with an Android user has always been an inferior one.
Using the service is like texting an iPhone user on an iPhone. You can send messages, chat in groups, send full-res images, see when others are typing, and even drop voice notes. All of this is presented as blue bubbles on the actual iPhone users' side, even though you're texting from an Android.
The method to this madness comes in the form of an Apple ID and a whole lot of Mac Minis. According to Nothing, Sunbird uses a patented process that links your Apple ID, which can be created for free even if you don't own an Apple device, to one of the company's Europe or North America-based Mac Mini "servers". More notably, both companies claimed that messaging through this three-way exchange would be end-to-end encrypted, which has since been refuted by several sources and outlets.
So when you send a text through the Nothing Chats app, you're technically messaging the server that's linked to your Apple ID first, which then forwards it to your iMessage contact.
This is all the base level of Nothing Chats, as the company says more familiar features like read receipts and message reactions and replies are coming in the future. And, for now, you'll have to have a Nothing Phone 2 -- I know, there are levels to this war of exclusivity -- to use Nothing Chats. But even if you meet all the requirements, the iMessage to Android app has been put on hold amid security concerns, so stay tuned for updates on that front.