CUL (カル) is a Japanese VOCALOID developed and distributed by Internet Co., Ltd., and was created in collaboration with VOCALO Revolution. CUL is VOCALO Revolution mascot character and she was released as a VOCALOID in December 2011 for the VOCALOID3 engine. Her voice is provided by Japanese voice actress and singer, Eri Kitamura (喜多村英梨; Kitamura Eri). She is a "Character Voice" type vocal.
She was introduced in "CUL makes Revolution!". CUL was featured in the show's introduction, the PV "白の季節" and the closing credits of the show. CUL was also the mascot of "CUL project; offical", a website designed to promote making her official. Stickers featuring her were also released on sale. The MMD model used in her PVs, such as "CUL makes Revolution!", was later released. She also appeared alongside 秋元結衣 in a music video that later made it to DVD.
Since CUL's existence as a VOCALOID is owed to her fans, CUL already had an established fandom prior to becoming a VOCALOID. She has had much support and publicity within the Japanese fandom which resulted in her overall positive reception. This made her one of the more popular releases for VOCALOID3 at the time.
CUL's popularity kept increasing after her release, according to Google Trends it peaked on July 2012. Afterwards she gradually lost popularity in the closing months of the VOCALOID3 era, she was overall less popular than before her release.