Character.AI

Character.AI (Character Technologies, Inc.) was founded in 2021 by Noam Shazeer and Daniel De Freitas, both former Google engineers who had worked on the transformer architecture and an internal chatbot Google declined to release. They left to build a platform for open-ended AI characters, and the product quickly became one of the most-used AI apps by engagement and session time.

In August 2024, Google struck a roughly $2.7 billion deal that granted it a non-exclusive license to Character.AI's technology and brought Shazeer, De Freitas and about 30 researchers back to Google DeepMind in a widely described 'reverse acquihire.' The structure drew antitrust and DOJ scrutiny for potentially sidestepping merger review. Character.AI continued operating independently under new leadership, later led by CEO Karandeep Anand, while facing lawsuits and regulatory pressure over teen safety.

The core product lets users create AI characters with custom names, personalities, greetings and voices, then interact through text chat and real-time two-way voice calls (Character Calls). Newer capabilities include AvatarFX, a diffusion-based model that animates a reference image into lifelike talking, singing and emoting avatars; Scenes, which provide shared story templates; Multi-Character Rooms where several characters interact together; and social Streams. Image generation via the Imagine Gallery arrived in 2026 for c.ai+ subscribers.

Character.AI runs its own proprietary large language models tuned for staying in character during long, open-ended conversations, with features like enhanced memory for subscribers. It is available on the web and through iOS and Android apps and supports multiple languages for both chat and voice. It does not offer a public developer API, third-party integrations, team collaboration or self-hosting, keeping it firmly a consumer entertainment product.

Character.AI targets consumers seeking entertainment, companionship and creative role-play rather than businesses. Its core audience skews toward younger, highly engaged users, including fans of interactive fiction, anime and gaming, hobbyist creators who build and share characters, and people wanting casual conversation or language practice. Following late-2025 safety changes, open-ended chat is restricted to adults 18 and over, reshaping its addressable audience toward mature users while minors are steered to Stories and gamified experiences.

Character.AI previously raised roughly $150 million in a 2023 Series A led by Andreessen Horowitz at a reported ~$1 billion valuation. In August 2024, Google entered an approximately $2.7 billion agreement for a non-exclusive license to Character.AI's technology and to hire co-founders Noam Shazeer and Daniel De Freitas plus about 30 researchers into Google DeepMind, a deal that drew DOJ antitrust attention.