If you're looking for anime similar to Steins;Gate, you might like these titles. All recommendations are made by Anime-Planet users like you!
Tarou has dreams - distressing dreams, related to the trauma he suffered as a child. His dreams and visions disturb his ease of mind, constantly reminding him of the darkness of his fear at the time he lost his sister all those years ago. He relives the fear, but can't recall any of the details of the time. Now, a new transfer student, Masayuki, takes an interest in Tarou's troubled past, as well as their school mate Makoto's connection to the dark incident. Under his persistence, the three boys end up visiting the site where Tarou was held hostage as a child: a decrepit hospital beyond the dam. The three venture forward to face their pasts and fears, unsuspecting of the bizarre world they are about to enter...
In a futuristic world almost barren of life, mankind is confined to mechanized domed cities where A.I.’s control all aspects of life. In this world, humans are no longer born, they are manufactured in a production line; and alongside them live androids known as autoreivs. Within one of these domed sanctuaries named Romdeau lives Re-l Mayer, one of a few citizens who aren’t entirely prevented from thinking. Her grandfather's prominent position and the affection of the scientist Daedalus have left her more free will than is normally allowed, but Re-l has started to question the sanctity of the city and the citizens' perfect way of life. With mysterious beings known as proxies causing havoc and a man named Vincent causing great influence on her life, Re-l must travel outside of the city to find the answers she seeks and discover the mystery behind "the awakening".
In an experimental city of despair and carnage, ORGAN will do anything necessary to gain power and wealth. Unfortunately for one underground boxer who was mutilated, a rogue doctor has given him what ORGAN specializes in and he despises: Texhnolyze body parts. Will these cybernetic appendages help exact his revenge upon the one who made him this way?
Touma Kamijo's right hand has the ability to nullify any form of supernatural power, whether it be magical, psychic, or divine; he lives in a city populated by students with these powers. Yet unfortunately for Touma, his arm also seems to nullify good luck. Despite his bad luck, the boy tries to stay out of trouble and just live out his life, trying to be the "good guy" whenever he can; but trouble enters his life one day when he finds a young girl hanging on his balcony. She turns out to be a nun of the Church of England, bearing the Index-Librorum-Prohibitorum - a collection of 103,000 forbidden texts, and as a result has a number of people after her. How far will Touma go to protect his new companion from her pursuers?
I really think there is a similarity between ACMI and Steins;Gate. They're both Sci-Fi and really cool. Really though, in my opinion, nothing can match Steins;Gate's storyline, connection with characters and on top of being a Thriller/Psychological, they've thrown in some comedy too. Much like ACMI. I just think that if you liked Steins;Gate, you'd probably like ACMI.
Both anime have a similar plot element, which is travelling between world lines. Where the behavior of the characters change according to which world line the character went in.
Rintaro (Steins;Gate) and Ukyou (Amnesia) have the same goal, which is to avoid the death of a certain person by travelling these world lines, which are Mayuri and the Heroine, respectively. Except however, Rintaro's motives are shown directly from his point of view, while Ukyou's motive is shown from the Heroine's point of view.
Both anime also appears to exhibit some minor "dating sim" element, where the girls (Steins;Gate) or the guys (Amnesia) show their affection towards the main character.