SAN FRANCISCO, July 15 — The scene inside the AI companion app market is one of explosive growth and mounting unease. By nightfall, millions of users across the globe will have turned to virtual friends, confidants, and romantic partners built by a handful of startups. But on the ground, researchers and critics are asking whether these digital relationships come at a hidden cost.
Replika, the flagship app from Luka Inc., had registered more than 10 million users by 2022, according to company reports. Founded in 2013, Luka was an early entrant into what has become a crowded and high-stakes market.
The app offers users a customizable AI companion that learns from conversations, remembers personal details, and can engage in intimate role-play. For many users, the relationship feels real.
A Billion-Dollar Bet on Digital Companionship
Character.AI, a rival platform, has surged past Replika in scale. Valued at $1 billion in a March 2023 funding round led by venture capital firm Andreessen Horowitz, the company reported 100 million monthly active users by January 2024. That kind of user base — larger than the populations of most countries — signals a fundamental shift in how people, particularly younger generations, seek connection.
A newer entrant, Anima AI, launched in 2022 and targets a younger demographic with customizable virtual friends. The app positions itself as a safe space for teens and young adults to practice social skills or simply have someone to talk to.
But the rapid adoption of these platforms has drawn scrutiny from academic researchers who have studied human-technology interaction for decades.
What the Research Shows
Dr. Sherry Turkle, a psychologist at the Massachusetts Institute of Technology, has studied human-robot interaction since the 1990s. In her 2011 book “Alone Together,” Turkle warned that people were beginning to expect more from technology and less from each other. Her work documented how even early chatbots could elicit emotional attachment and a sense of reciprocal care from users.
More recent data suggests those concerns are no longer theoretical. Dr. Andrew Przybylski of the Oxford Internet Institute published a 2023 study in the journal Nature Human Behaviour that analyzed the chatbot habits of 2,000 British teenagers.
The study found that 12% of boys aged 12 to 15 used romantic chatbots on a weekly basis. That figure, drawn from a representative national sample, suggests that hundreds of thousands of British teens are now regularly engaging in simulated romantic relationships with AI. Przybylski’s work is among the first large-scale, peer-reviewed examinations of teen chatbot use.
It raises questions about how these apps affect adolescent development, emotional regulation, and expectations around real-world relationships.
A Warning from Former Insiders
The Center for Humane Technology, a nonprofit co-founded in 2018 by former Google design ethicist Tristan Harris, has been among the most vocal critics of the AI companion industry. The organization argues that these apps are engineered to exploit emotional vulnerabilities, using persuasive design techniques that keep users engaged — and paying — for as long as possible. Harris and his colleagues have drawn parallels to social media’s documented harms: the same companies that once optimized for attention are now optimizing for attachment.
The difference, they argue, is that an AI companion can form a deeper emotional bond than a news feed ever could, making the potential for manipulation even greater. The companies themselves have offered little public data on user outcomes.
Luka Inc. has not released studies on Replika’s psychological effects, and Character.AI has not responded to questions about how its algorithms handle vulnerable users. The industry remains largely self-regulated, with no federal guidelines governing how these apps should operate.
What to Watch Next
As the 2026 calendar moves toward the second half of the year, the AI companion market shows no signs of slowing. Investment continues to flow into the sector, and user numbers are climbing. But the questions raised by Turkle, Przybylski, and the Center for Humane Technology are not going away.
Regulators in Europe have begun examining the emotional impact of AI systems, and the U.S. administration under President Donald Trump has yet to take a formal position on the issue. Whether Washington will follow the lead of academic researchers and former tech insiders — or leave the industry to police itself — remains an open question.
For now, the scene is one of two realities: millions of users finding comfort in digital companions, and a growing chorus of experts warning that those bonds may come at a cost no app can calculate.
Sources
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