RemixOS is an Android-Based OS for computers, built on android 5.1.
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There's never as good a price as a grand total zero dollars, and that is exactly what this will cost you. That means that if it does not work, if your not happy with it, or if you just cant afford buying an operating system, you can still get RemixOS.
The simple fact that its a real operating system, and not an emulator, means that you can use it without emulator related slow downs.
Con Problems with Nvidia cards
Many people seem to have problems loading React OS with nvidia cards. This may be due to maxwell driver issues.
Con Still in beta
As of March 2016, RemixOS for computers is still in beta, meaning that some things might not work.
Con No Google Play Services
Google play is the biggest go to for mainstream android apps, so it can be quite disagreeable not to have it out of the box.