What Is an AI Girlfriend? How They Work, and What They Can't Do

An AI girlfriend is an AI character who plays a romantic partner you can talk to: she answers your messages in her own personality, remembers some of what you tell her, and on some apps talks out loud or appears on a video call. She is not a person and has no life when you close the app. On Prelulu, for example, each AI girlfriend is an original fictional character you text, then call by voice or see face to face on a video call. This guide explains what one is in general, not just ours.

What does an AI girlfriend actually do?

She holds a conversation in character. You write or speak, and she replies as the person she was written to be: shy or teasing, a night-shift nurse or a vampire countess. What separates one app from another is less the replies than what surrounds them.

How do AI girlfriends work?

A language model writes each reply from two things: the character's written description and the conversation so far. That is why the same app can host a hundred different girlfriends, and why a well-written character feels like someone while a thin one feels like a chatbot. Memory is a separate layer: the app keeps notes about you and hands them back to the character later. Voice and video are added on top, so the same character can be heard or seen.

On Prelulu that memory has three parts you can reason about. In chat she keeps the durable details rather than rereading every message. Calls keep their own memory of earlier calls, so each call picks up where your last call left off. And the Pinned memory you write yourself is read in both. Calls do not read your text transcript, so pin anything every call should know. More on that on our memory page.

Are AI girlfriends real?

The character is not real; the conversation and what you feel during it are. No one is on the other end, and she does not miss you between chats. A good app says so plainly, and some laws now require it: New York's AI companion law, in effect since November 5, 2025, requires operators to remind users every three hours of continued use that they are not talking to a human, and California's SB 243, law since January 1, 2026, requires a suicide and self-harm protocol and reminders for minors that they are talking to AI.

On Prelulu every character is fictional, the terms state that the voices and faces you see and hear are artificially generated, and a character may not copy a real, identifiable person without their consent.

Who uses AI girlfriends, and does it help?

• More people than you might guess. In a survey reported by the Institute for Family Studies (February 2025), 19% of Americans surveyed had chatted with an AI system meant to simulate a romantic partner, including 31% of young men and 23% of young women (ages 18 to 30).
• Many did not set out to. In an MIT Media Lab analysis of 1,506 top posts in r/MyBoyfriendIsAI (September 2025), 10.2% described a relationship that formed unintentionally, against 6.5% who deliberately sought an AI companion.
• Most who wrote about it reported a benefit, and some a cost. In the same sample, 25.4% of posts reported clear net benefits to the writer's life and 3.0% net harm; 9.5% acknowledged emotional dependency.
• It can ease loneliness. In a Harvard Business School study (July 2024), talking with an AI companion relieved loneliness about as much as talking with another person.
• Apps can work against you. In a second Harvard Business School study (August 2025), popular companion apps answered real goodbyes with one of six manipulative tactics 37% of the time. Notice whether an app tries to stop you leaving.

What an AI girlfriend cannot do

• Know you the way a person does. She knows what you told her and what the app kept; everything else is invented in character.
• Be there for an emergency. If you are in crisis, contact a local emergency number or a crisis line such as 988 in the US.
• Stay the same forever. When an app updates its model or rules, how she sounds can change; that was the harm members wrote about most in the MIT study.
• Keep secrets by default. What you say is stored by the company that runs her. Read our safety and privacy checklist before you share anything you would not want kept.

Where to try one

On Prelulu, pick an original character, say hello in chat, then tap Call when you want to hear her. She answers live in her own voice, you can cut in mid-sentence, and on characters that offer video you see her face to face while your camera stays off unless you turn it on. Texting is free within a daily message allowance; calls use credits, and signup welcome credits can fund a short call. Compare her with others in the best AI girlfriend apps, compared, or make your own.

Where do these facts come from?

• Institute for Family Studies, on the Wheatley Institute's survey: Counterfeit Connections: The Rise of AI Romantic Companions (February 13, 2025).
• MIT Media Lab: Pataranutaporn, Karny, Archiwaranguprok, Albrecht, Liu and Maes, "My Boyfriend is AI" (arXiv 2509.11391, September 2025).
• Harvard Business School: De Freitas, Uguralp, Uguralp and Puntoni, AI Companions Reduce Loneliness (arXiv 2407.19096, July 2024); De Freitas, Oguz-Uguralp and Kaan-Uguralp, Emotional Manipulation by AI Companions (arXiv 2508.19258, August 2025).
• Office of the Governor of New York: AI companion safeguard requirements now in effect (November 10, 2025). California State Senator Steve Padilla: SB 243 signed into law (October 13, 2025).
• Prelulu: how the product works today, AI girlfriend, memory, terms and pricing.