Say what you mean.
Understand what they meant.

Koto helps English and Japanese speakers understand the context behind a phrase, find words that still sound like themselves, and learn from real conversations.

See how Koto helps About the private beta

The words are only
part of the meaning.

Koto composer asking how to write a warm message to a friend in Japanese

Koto suggesting a warm, natural Japanese message to a friend

01 / What Koto does

More than translation.

Meaning changes with the moment, the relationship, and what you hope will happen next.

Understand the situation.

See the tone, relationship, cultural context, and what is really being said.

Find your natural words.

Shape a message that carries your intent without flattening your personality.

Reply with the relationship in mind.

Move the conversation forward with words that fit both the person and the moment.

A real Koto conversation

Ask what the words mean in this relationship—not only what they translate to.

Koto explains that また今度 does not always confirm definite plans and offers a clearer alternative

02 / How it stays with you

A conversation can become something you keep.

Koto connects the moment you needed a phrase with the context that made it matter—so it can return when it is useful again.

01Ask
02Understand
03Save
04Revisit
05Use

Save with context

Keep the reason, not only the phrase.

Save useful language with the situation, your own notes, and the nuance you do not want to forget.

A warm Japanese expression saved in Koto with meaning, tone, and friend context

Return when it matters

Remember without being chased.

Bring useful language back into view without streaks, leaderboards, or artificial urgency.

Koto Revisit card asking for the saved Japanese phrase

Koto Revisit card with the Japanese answer revealed

03 / Two directions

Built for both directions.

Koto is designed around the different questions English and Japanese speakers bring to one another—not a single interface with the labels swapped.

English日本語

Turn your thought into natural, context-aware Japanese while keeping your own voice.

Koto helps an English speaker express a warm message naturally in Japanese

日本語English

Understand intent and nuance, then find clear, natural English that keeps the original meaning.

04 / Built with care

Built with care, not pressure.

A calmer way to understand, express yourself, and keep learning from real life.

Context before certainty.

Language can carry more than one meaning. Koto helps you examine the situation instead of pretending there is always one perfect answer.

Your voice stays yours.

Suggestions adapt to your purpose and relationship, so the final words can still sound like you.

Learning without streaks or guilt.

Come back because a phrase matters—not because an app is counting the days.

A few things to know.

What is Koto?

Koto is an English–Japanese communication and learning companion. It helps with context, tone, expression, replies, and remembering language from real situations.

Is Koto available on the App Store?

Not publicly. Koto is currently being tested through a private TestFlight beta, so access is invitation-only and features may change between builds.

Does Koto work without an internet connection?

Saved expressions, notes, existing chats, Kana, review, and other local learning can remain available on your device. New AI replies and cloud voice features require an eligible online connection and permission.

Does Koto replace human judgment?

No. Language is personal and situational, and AI can make mistakes. Koto is designed to help you think through an expression—not make important decisions for you.

Current availability

Koto is in private TestFlight beta.

The app is still being tested and refined. Support information explains what is available now and how invited testers can report an issue.

Read beta support

Say what you mean.Understand what they meant.