CeVIO is a Japanese voice synthesis software suite developed to create singing and speaking voices. It features a range of voicebanks and characters, enabling users to produce songs and spoken dialogue with synthesized voices. CeVIO has become popular for its user-friendly interface and has spawned various voicebanks and character expansions. The software is primarily used in music creation, voice acting, and content production, often compared to other vocal synthesis platforms like VOCALOID.