ja-JP · 日本語
Japanese AI Voices
Japanese is the first non-English language we are building, because audio drama and character-voice culture are stronger there than anywhere else. It is not shipped yet, and this page says so plainly rather than listing voices that do not exist.
Not available yet. There are no Japanese voices in this release. This page exists to say what is planned and what it has to get right, not to sell you something that does not exist.
Why Japanese is first
Drama CDs, character songs and voice-acted media are a mainstream format in Japan rather than a niche one, and the audience for multi-voice audio is correspondingly large. It is also the language where our English-language users most often want a second track, particularly for anime-adjacent work.
The technical work is not simply adding voices. Japanese requires reading disambiguation for kanji, correct pitch accent, and handling of the politeness registers that carry most of the social information in dialogue. Shipping voices without those is worse than shipping nothing.
What will need to be different
Pitch accent is phonemic in Japanese — get it wrong and you have said a different word, not merely an accented version of the right one. Any serious implementation needs per-word accent data and a way for users to correct it, which is the equivalent of the pronunciation pass in English but load-bearing rather than cosmetic.
Politeness level is the second issue. The same line in plain form and in polite form is a different character, and a casting layer that ignores register would mis-cast constantly. That has to be part of the character card, not a rendering setting.
What to do in the meantime
- Use English today
The English library is complete and many anime-adjacent projects are produced in English for international audiences.
- Export subtitles
A Japanese subtitle track on English audio is the practical route to a Japanese audience right now.
- Structure the project for a second track
Keep one line per utterance so a Japanese dub can be dropped in later without restructuring.
- Tell us what you need
Which registers and character types matter most to your work directly affects what we build first.
- Watch the roadmap
Japanese is first in the queue; Spanish, Brazilian Portuguese and Korean follow.
Frequently asked questions
When will Japanese be available?
We are not giving a date we cannot keep. It is the next language in development and the work is pitch accent, kanji readings and politeness registers rather than voice collection.
Can I generate Japanese text with an English voice?
You can paste it, and the result will be wrong in ways a Japanese listener finds unpleasant. We do not recommend it and we would rather tell you that than let you find out after rendering an episode.
Will it handle kanji readings?
It must. Name readings in particular are ambiguous, and any implementation without a correction mechanism would be unusable for fiction, where invented names are common.
Is romaji input supported?
That is under consideration as a fallback for correcting specific readings. It is not a substitute for proper kanji handling.
Cast your first scene tonight
Paste a script, let CastDub assign a voice to every character, and export a finished drama.
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