Features
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Screenshots
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No, the user app is a common app with some permissions to grant access to user phone/tablet, but it also works in rooted devices.
Only Android Oreo or newer phones/tablets can be controlled (Android Oreo was launch in 2017).
You can control this devices from any other platform, through android app or any browser.
No, for security and privacy reasons it is necessary to install an application on the device that you want to control.