Over the years, we've seen a few developers try to bring iMessage to Android devices using a variety of workarounds.
Today, another attempt at bringing iMessage to Android has emerged, but like other efforts in the past, we don't expect this one to last...
weMessage is a new app for Android that claims to bring iMessage to non-Apple devices by using your Mac as a sort of middle-man between the iPhone and the Android phone.
The developer of weMessage explains that he tapped into several Accessibility features on macOS in order to get his app up and running: weMessage works by using Apple's developer tools that hook into the Messages app, as well as by turning on Accessibility features that will perform the message sending.
In addition, I believe this implementation is fair, as you still need to have an Apple device to use iMessage, but it is merely being extended to all devices There are a few privacy concerns here.
Prior to WWDC last year, it was reported that Apple would officially launch iMessage for Android, but that ultimately never came to fruition with Apple explaining that doing so would take a way a major selling point from iOS.
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