While the game is very basic but it does work, and it has all of the official artwork from the cards (which may cause it some problems if Hasbro takes notice). This online version of Monopoly Deal has been built by a fan and so the interface isn’t particularly amazing and it’s pretty slow. Or a fake email address will work too if you don’t want to use your real one. You just need to sign up with your email address. The unofficial version is called PlayMDeal and it’s completely free to play.
In theory, it may be taken down at any time if Hasbro decides it infringes on its intellectual property. An unofficial version has been developed but this is not affiliated with Hasbro at all. There isn’t an official version of Monopoly Deal that you can play online on your laptop or PC.