Ask about the meaning behind a phrase. Find natural words for the moment. Keep what you want to use again.
Explore Koto
Understand
「また今度」 can leave a plan open. Koto helps you explore what a phrase might mean—and what is still uncertain.
The same words can land differently depending on the moment.
Between close friends, it could be a warm invitation to reconnect.
A gentle reply can leave the timing open without closing the door.
Without a date or follow-up, it is not a confirmed plan.
A possible reading, not a verdict on someone’s intentions.
Keep what matters
A useful expression stays with its meaning and the situation that made it matter.
Swipe, choose a moment, or play the story.
Tell Koto what happened, who you are speaking to, and how you want your words to feel. A useful answer starts with the situation—not a word-for-word swap.
Here, the question is how to write warmly to a close friend in Japanese.
Ask what a phrase might mean in this relationship. Koto can unpack the nuance while making room for what the words alone cannot tell you.
「また今度」 leaves the timing open; context matters more than a literal gloss.
When an expression is worth keeping, save it with its meaning and the situation that made it useful. The context is there when you return.
A warm follow-up to a close friend becomes more than an isolated sentence.
Come back to a saved expression and try to remember it before revealing the answer. Review stays connected to language you actually wanted to use.
No streak to protect—just the phrase, its meaning, and your own pace.
More ways to use Koto
Get help with a message and leave, or keep what you learned for later. These are choices, not steps you have to complete.
Appearance
Koto Style brings the app’s colors, controls, and wallpaper together. Choose from five real styles, from the warm Koto Classic to the dark Midnight Ink. Light, Dark, and System appearance are separate choices; you can also use Your Photo as a personal wallpaper.
Warm paper, indigo, and coral.
These are crops of the current Koto Style picker. This website preview does not change your app.
Personalization
Set your language direction, level, learning focus, and reading aids. When you ask a question, tell Koto who you are speaking to and what you want to say. Those details help the answer fit the moment, without pretending to know someone else’s mind.
Koto is not individually training an AI model on you. Temporary conversations do not send the ordinary learner context used for supported learning requests.
Your selected direction and reading support shape how Koto presents language.
The situation and tone you provide belong to this question. You can simply get help and move on.
A deliberate save keeps a useful expression with its context for Memory and possible review. It does not save every conversation.
Talk with Koto · Beta
Choose a situation and a goal, then practice a conversation at your own pace. Guided practice gives you time to prepare each reply.
How it works
Start with a situation, like making plans with a friend, and set a goal.
Read or hear Koto’s prompt. Speak or type your reply, with Help when you need it.
Finish for a short recap. Where offered, keep a useful expression for later.
Beta: replies and feedback may be inaccurate. Natural conversation is marked “In development”; this is guided turn-taking, not interruption-capable live voice chat.
Memory & Revisit
Save an expression because it answered a real question. Koto can keep its meaning, reading, situation, and notes together. Eligible saved expressions can then appear in Revisit: recall the meaning first, reveal the expression, and choose “Still learning” or “Got it” to guide when it returns.
A word you saved from a real question becomes a card you can recall, not just an answer you once saw.
Ordinary saved learning expressions can enter review; sensitive or paused items do not. Optional local reminders require notification permission.
Reveal a flashcard, then swipe left or right to review it.
Useful when the moment calls for it
Ask in English for natural Japanese, or begin in Japanese and work toward natural English.
Hear an expression at a natural or slower pace where playback is available.
Ask about a photo, camera image, or supported image file; choose reading aids when Japanese text needs more support.
Koto for iPad
On iPad, a few tools use the extra space in ways they cannot on iPhone. See the current iPad build in action.
Swipe, choose a view, or play the story.
A phrase can mean more than one thing. Explore the situation without assuming you know someone’s mind.
The thinking behind Koto, its name, and Kiko.
Read Our StoryAsk, save, and revisit useful English and Japanese in your browser. Sign in and enter your invitation code to get started.
Go to Koto Web App Invitation required.
Current availability
Koto for iPhone is available to invited testers through a private TestFlight beta. The app is still being tested and refined.
Read beta support
TestFlight · Invitation only
