Yes, it is based on a claimed true story. The Lutz family moved into a house in Amityville, New York, and reported experiencing numerous terrifying and unexplained phenomena, like strange noises, cold spots, and apparitions. However, there has been a lot of controversy and speculation over the years about whether the events were truly supernatural or perhaps exaggerated for various reasons.
Well, the Amittyville Horror was presented as a true story initially. The Lutz family said they had all sorts of spooky experiences in that house. But later, some people thought that there might have been elements of exaggeration or even fabrication. For example, the idea of the house being haunted by some malevolent force could have been a way for the family to get attention or perhaps there were natural explanations for the things they claimed to experience that they didn't consider at the time.
Some believe it was based on real events, but there's a lot of skepticism. The story has elements that might have been exaggerated or fictionalized for effect.
It's not a true story. Antiville Horror is in the realm of fiction. The story was crafted to thrill and engage the audience rather than being drawn from actual happenings.
The story of the Amityville Horror has elements that are claimed to be real, but many aspects have been questioned and investigated. There's no definitive proof that it's a 100% true account.