Kotonoha Akane/Aoi

Kotonoha Akane & Aoi (琴葉茜・葵) are a pair of Japanese VOICEROID+ voicebanks released 25 April 2014. They were produced by AI, Inc. using AITalk and distributed by AH-Software, with voiced by Yui Sakakibara.

Text-to-speech
Kotonoha Akane & Kotonoha Aoi's VOICEROID+ voicebank was distributed by AH-Software and released on 25 April 2014. The VOICEROID2 voicebank released on 9 June 2017, added a Voice Style feature.

On 22 February 2020, a text-to-speech synthesizer software A.I.VOICE released the product "A.I.Voice Kotonoha Akane & Aoi", added two voicebanks with younger voices, Kotonoha Akane Tsubomi and Kotonoha Aoi Tsubomi. The English version released on 10 December 2021 and Chinese on 22, September, 2022.

Singing voice synthesis
Kotonoha Akane & Aoi's shared singing library for Synthesizer V Studio produced by AH-Software released on June 26, 2020. The recommended rhythm is between 70 and 180 bpm, and the recommended range is between E3 and D5. The included scales are G ♯ 3, C ♯ 4, F ♯ 4, and C5 (falsetto).

The NEUTRINO's Kotonoha Akane & Aoi singing voice library have been available for free to users who purchase "A.I.Voice Kotonoha Akane & Aoi" since 25 April 2022. The recommended range for Kotonoha Akane is between mid1G and hiC (G3 to C5), with a recommended rhythm of 120 to 180 bpm, and the recommended genres are rock, pop music, etc.; The recommended range for Kotonoha Aoi is between mid1G and hiC (G3 to C5), with a recommended rhythm of 80 to 140 bpm, and the recommended genres are pop, folk music, etc.

Voice conversion
The voice model library of Kotonoha Akane & Aoi for an AI voice conversion application Voidol was produced by Crimson and released on 12 October 2021. Released on 17 May 2022, the voicebank of Kotonoha Akane & Aoi for a voice conversion software Seiren Voice was produced by Dwango.

Character
Kotonoha Akane & Aoi's character art were designed by Japanese illustrator Yoshida Yoshitsugi. They are a pair of twin sisters.

Akane is used to speaking in the Kansai dialect for she lived in Kansai region for a long time, and Aoi has standard intonation. Akane is "outgoing and cheerful" while Aoi is "calm and reliable".