15.ai was a free web application that used artificial intelligence to generate text-to-speech voices of fictional characters from popular media. The platform was created by a pseudonymous researcher and allowed users to make characters speak custom text with emotional inflections. The service gained popularity in 2021, but was shut down in 2022 due to legal issues surrounding artificial intelligence and copyright. The creator later launched a sequel, 15.dev, which was also shut down in 2026.