Japanese voice for apps, offline

Short answer: 46 Japanese offline voice packs across 23 industries, from $24 to $149 one time per voice, each with the open-source agent. Hear a free 25-sentence sample before you buy.

Every Japanese bundle

Using Japanese speech in your app

1. Offline pack (one payment): download the zip, bundle the audio with your app and play a sentence by looking it up in manifest.json. No network call, no per-play fee.
2. API for new text: Japanese is supported for any sentence. Install an SDK (npm install speakvora or pip install speakvora) or call the endpoint directly:

   curl https://speakvora.com/api/v1/speak -H "Authorization: Bearer $SPEAKVORA_KEY" -H "Content-Type: application/json" -d '{"text":"...","voice":"jf_alpha","lang":"ja"}'

Sample Japanese sentences

• あなたのアカウント残高をお調べいたしました。
• お使いのデバイスのスペックを確認してもよろしいでしょうか。
• お客様がどのような状況でご不満をお感じになったのか、詳しくお願いいたします。
• あした九時から六時まで営業しています
• お仕事の都合で、鍵の持参が難しいのですか。
• お客様のお車がオーバーヒートしているとのことですね。本日中にご来店いただくことをお勧めします。
• あした十時からのご来店をお待ちしています。
• あした十時にお店がオープンしますよ。
• あした午前十時のオープンです。

Play the free 25-sentence sample of any bundle from its page.

The agent that comes with every pack

Every pack includes an open-source agent (MIT license, on GitHub) that runs on your own server and your own phone, Slack, calendar and email accounts. It only says the approved sentences, always honours STOP, starts in practice mode so nothing goes out until you switch it on, and needs the internet (and your own providers) for texts, calls and Slack. How the agent works.

Honest limits

• The voices are synthetic. Where the law or good practice requires it, tell listeners they are hearing an automated voice.
• Non-English audio is marked native review pending until a native speaker approves it.
• Packs are generic, ready-made lines in the library's voices. They are not your brand voice or a script written for you; for a new sentence call the API.
• The licence lets you play the audio inside your own apps, devices and services, commercially and offline. You may not resell or redistribute the files or use them to train speech models.

Honest limits

• The voices are synthetic. Where the law or good practice requires it, tell listeners they are hearing an automated voice.
• Non-English audio is marked native review pending until a native speaker approves it.
• Packs are generic, ready-made lines in the library's voices. They are not your brand voice or a script written for you; for a new sentence call the API.
• The licence lets you play the audio inside your own apps, devices and services, commercially and offline. You may not resell or redistribute the files or use them to train speech models.

Questions

Is there a Japanese text to speech API for apps?

Yes, for new text: the API speaks Japanese (lang "ja") on any paid account, and the SDKs (npm and pip: speakvora) wrap the same endpoint. Packs cover the sentences you repeat.

Does Japanese speech work offline?

Yes for the recorded sentences: a pack is a folder of audio files plus a manifest, so your app plays them with no network call and no per-play fee. Texts, calls and Slack from the included agent do need internet.

How much do the Japanese bundles cost?

46 Japanese listings, from $24 to $149 one time per voice. Every pack has a free 25-sentence sample.

Is the Japanese audio reviewed by a native speaker?

Not yet for non-English packs: each is marked native-speaker review pending, and we say so on every page and in every download.