Kaguya

No more “Wait, what did they say?”

Understand any language as it's spoken — and learn from it afterward.

A group of colleagues speaking Korean, French, English, Chinese and Spanish gather around a phone running Kaguya, smiling as the conversation is translated.
Start free See how it works

Free to startNo sign-up17 languages

Currently available on the App Store in Japan.

No sign-up. Start right away.

30 minutes free every month

Need more? Plans from ¥980/month

SIMPLE

No sign-up. Just open it and go.

No name, no email address. Open the app and start using it right away. A sample Japanese/English/Chinese meeting is included, so you can see what it does even with no one to talk to.

PRIVACY

Built to keep as little of your conversations as possible.

Transcripts, translations and recordings are stored on your device. Our servers never store what was said, and the data sent to the AI service is not used to train its models.

MADE IN JAPAN

Designed and built in Japan.

Planned and developed in Japan, with care over everything from the wording on each screen to the smallest interaction.

* If you turn on the feature that improves recognition, Kaguya may store short phrases it misheard. You can turn this off in Settings and delete stored phrases at any time. See the Privacy Policy for details.

TWO WAYS TO USE KAGUYA

Understand it now. Learn from it later.

Kaguya is more than a translator. The same app that helps you follow a conversation in the moment can turn what you heard into something you keep.

NOW

Understand it now

Mode: Interpret

Speech becomes text and translation as it's spoken, whoever is talking and in whatever language. When you're done, an AI summary pulls out what was decided and what comes next.

LATER

Learn from it later

Mode: Study

The original, its translation and the phrases worth learning line up, all taken from what was actually said. Tap a line to hear it again from the moment it was spoken.

Tap New recording and choose Interpret or Study. Both are in the same app.

Before, during, and after every meeting.

Catching the words isn't enough to move a meeting forward. Kaguya helps you understand, speak up, look back, and carry it into the next one.

DURING

Read the discussion as it happens.

Speech becomes text in real time, with a translation beside it. Missed a line? It's right there on screen.

WHEN YOU SPEAK

Don't just keep up. Drive the conversation.

When you truly understand what's being said, you can speak with confidence. Go from reacting to leading.

AFTER

Go straight back to what mattered.

The recording, transcript, translation and notes stay together as one record. An AI summary gives you the big picture, so you can go back and check exactly what someone meant.

NEXT TIME

Your own conversations become the lesson.

Learn the words and phrases that actually came up. Not from a textbook, but from your own work.

Two people across a café table. One has Kaguya open on an iPad, and the other person's words appear on screen with a translation beneath each line.
The conversation keeps moving. You no longer wait to understand.

STUDY MODE

What you hear becomes what you learn.

Today's conversations become your lessons.

No textbook sentences. Kaguya learns from the language you actually ran into today, at work, in a café, on the news, and turns it into lessons made from your own day.

  1. Let it listenA conversation around you, the TV, a video or the radio. Just set your phone nearby.
  2. See both side by sideWhat was said and what it means, paired sentence by sentence.
  3. Phrases are picked outExpressions worth learning, with their meaning and how they're used.
  4. Listen back laterTap “Original” on a line to hear it from the moment it was spoken, or “Translation” to hear the translation read aloud.

Every phrase comes from what was actually said. The AI never invents related words to pad the list. Choose the language you want to learn in Settings. Any supported language other than your own works.

French, overheard at a café

00:18

On pourrait décaler la réunion à jeudi, si ça vous arrange.

We could move the meeting to Thursday, if that works for you.

Phrases to learn
décalerto move, push backfor a date or time
si ça vous arrangeif that suits youa polite way to offer an option

Japanese, from the TV news

00:42

新しい制度は、来年4月から施行される見通しです。

The new system is expected to take effect next April.

Phrases to learn
施行されるto take effectused for laws and rules
見通しoutlook, expectationcommon in news reports

Spanish, at a hotel front desk

01:05

¿Me podría guardar la maleta hasta la tarde?

Could you keep my suitcase until the afternoon?

Phrases to learn
¿Me podría…?Could you… for me?a polite way to ask a favor

Examples. Translations appear in the language you read.

Key features

All you do is press a button.

Text and translation, as it's spoken.

Transcription and translation keep pace while people are still talking.

No language to pick.

Whoever speaks, in whatever language, Kaguya recognizes it and translates into yours. 17 languages supported.

An AI summary when you're done.

It pulls out the overview, the decisions and the action items. You can also play back the recording to check.

What you hear becomes your lesson.

In Study mode, the original, the translation and the phrases to learn line up. Only words that were actually spoken.

JapaneseEnglishChineseKoreanThai VietnameseIndonesianSpanishPortuguese FrenchGermanItalianRussian ArabicHindiTurkishDutch

Your records stay with you.

What's said in a meeting is the work itself, so we keep our handling of it to a minimum.

  • Recordings are stored on your device.
  • You can choose in Settings whether to keep audio.
  • You can delete all audio at once and keep your transcripts and translations.
  • To transcribe and translate, audio is sent to an external AI service while it's being processed.

See the Privacy Policy for details.

Requirements

  • iPhone / iPad (iOS 15 or later)
  • An internet connection
  • Works alongside your meeting app
  • Currently available on the App Store in Japan

Pricing

A human interpreter can cost a great deal for a single session. Kaguya starts free, with paid plans from ¥980 a month.

STANDARD / MOST POPULAR

¥980/month (tax incl.)

180 minutes a month: about three hours of meetings at standard quality.

No add-on fees. Transcription, translation and summaries are all included.

Start at ¥0 with 30 free minutes every month.

Free

¥0

30 min / month

  • Interpreting, transcription, translation
  • Recording and playback
  • Up to 15 min a day
STANDARD

Standard

¥980/mo

180 min / month

  • Higher-quality translation
  • Up to 80 min a day
  • For everyday meetings

Pro

¥2,480/mo

450 min / month

  • Higher-quality translation
  • Up to 200 min a day
  • Up to 2 devices at once

Business

¥6,480/mo

1,200 min / month

  • Higher-quality translation
  • Up to 500 min a day
  • Up to 3 devices at once

Minutes are estimates at standard quality. Higher-quality translation uses them faster. Standard's 180 minutes a month covers about three hours of meetings at standard quality. Prices are in Japanese yen and include tax. Billing is through the App Store, and you can cancel from Settings on your iPhone or iPad.

Princess Kaguya before a full golden moon.

Across any distance.

In the Japanese folktale The Tale of the Bamboo Cutter, Princess Kaguya shares her heart across the vast distance between the moon and the earth.

A different language can open that same distance, even between people in one room. We named the app Kaguya in the hope that what you mean can cross it, and arrive just as you meant it.

Kaguya supports 17 languages and tells them apart automatically. Switch Settings to Manual and narrow down the languages you use, and recognition becomes more accurate.

Start with your next conversation.

Try your 30 free minutes in a meeting you already have.

Start free

Currently available on the App Store in Japan.