I absolutely love horror movies and have a long list of fantastic ones but not very many of them actually scared me. Most of them have been named already but two I didn't see were The Babadook (2014) and surprisingly a Netflix movie called His House (2020) was actually awesome. One of my favorites in the last few years.

can recommend Coherence

May be Apostle? It's one of the memorable ones among recent horror.

I really enjoyed Pandorum and The Babadook.

“Host” fucked me up and is the reason I don’t watch horror movies anymore. I’m a huge baby though.

I'm noticing a distinct lack of Terrifier and Terrifier 2 in these comments. Art the Clown is perhaps the best antagonist I've ever seen in the horror genre and true originality is rare in the modern horror filmscape.

The Ring is also good for originality as far as modern classics, though it's a whole book series in Japan.

Edit: I also liked The Shrine, forgot to mention that one. Again, originality.

Soft & quiet.

Humans are a terrible thing

https://m.imdb.com/title/tt14557188/

Talk To Me. I would also say Sinister and The Conjuring are my favorites, and I also struggle to find scary movies that genuinely scare me. Watch this alone in the dark the first time. It is now my all-time favorite scary movie, and it's fairly recent.

Megan is Missing (2011) is one of the most horrifying films I've ever seen. Fair warning though, the last ten minutes are excruciatingly painful to watch. It is not for the faint of heart.

In the gore porn genre Cannibal Holocaust (1980) and Hostel (2005) are vile, but so pointlessly gorey the actual horror (the brutality of men) is almost entirely lost.

Funny Games (1997), or the 2007 American remake for those who don't love subtitles, is another unnerving portrayal of ultra violence. It's not gore porn, but is graphic. The original version's pacing will make you squirm in your seat.

Hush (2016) and Creep (2014) are two of my movie-night-with-friends films. Still very much about the human monster, but not overly graphic and prefers to build by making the viewer a partial participant. You have to be a certain level of broken to enjoy some of the others on my list, but these two are disney movies compared to Cannibal Holocaust.

My vote goes to The Vanishing (1988).

"Ju-On: The Grudge" from 2002 was probably one of the scariest movies I've seen (if you don't mind reading subtitles). The US remake did not do it justice IMO. I don't know how well it holds up nowadays since it's so old and I was a lot younger when it came out.