You can watch the movie Ready or Not (2019) on several streaming platforms:

• Disney+ offers Ready or Not for streaming

• Netflix also streams the movie

• fuboTV currently streams Ready or Not

• It is available for purchase or rental on Microsoft Store, Amazon Video, Apple TV, Fandango At Home, and Cineplex

• Additionally, it can be rented or bought on Google Play Movies and other digital stores

So depending on your location and subscription, Disney+, Netflix, or fuboTV are good options to stream it directly, or you can buy or rent it on various digital platforms.