Ruby Messenger
Chat in Japanese with furigana that adapt to your level.
When friends text you in Japanese, you shouldn't have to juggle dictionary apps. Ruby Messenger puts furigana on the kanji you don't know, explains words with a tap, and turns your real conversations into flashcards.
Everything you need to learn through real conversations
1Read
Furigana that fit your level
Every message gets accurate furigana automatically. They appear as soon as the reading is ready, and native speakers in your chat can quickly fix rare mistakes.
But here's the best part: Set your level, and furigana only show up on words you actually need help with. Familiar kanji stay bare. This way, your reading skills get stronger instead of relying on training wheels forever.
The same message at two levels
来週、図書館で一緒に勉強しませんか？
来週、図書館で一緒に勉強しませんか？
2Understand
Tap a word. Stay in the chat.
Stumbled over a word? Just tap it. You'll instantly see what it means — explained in simple Japanese, with a translation right below it. No copy-pasting, no switching to a dictionary app. You stay in the flow of the conversation, and your chats stay natural.
3Remember
Learn the words your friends actually use
Textbooks are great, but real life is better. Turn any word into a flashcard with a single tap. Ruby Messenger saves the word together with the original sentence and the person who sent it.
Our built-in spaced repetition system (SRS) brings the word back right before you'd forget it. You learn exactly the vocabulary you need for your daily life — and that's why it sticks.
Vocabulary
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食べるたべる
私は誕生日に美味しいケーキを食べました。
to eat
Saved today
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誕生日たんじょうび
私は誕生日に美味しいケーキを食べました。
birthday
Saved today
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図書館としょかん
来週、図書館で一緒に勉強しませんか？
library
Saved yesterday
4Explore
No chat partner yet? Use your self-chat.
Found a sentence you want to crack — a tweet, a restaurant menu, or a song lyric? Paste it into your personal self-chat. It immediately gets the full treatment: furigana, tap-to-translate, and flashcard creation. Ruby Messenger is your personal Japanese lab from day one, even before you invite anyone.
Pasted from a restaurant menu
A private space for your Japanese.
Ruby Messenger isn't a social network. It's a quiet, safe place to practice Japanese with the people you actually know.
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Invite-only chats
No random messages, no spam. You only connect with people by sharing a private, unique invite link with them.
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Completely unsearchable
We don't have public profiles or user searches. Nobody can stumble across your account or message you out of the blue. What you say stays between you.
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For learners, families, and language partners
Built specifically for meaningful conversations—whether you're chatting with your host family, your tandem partner, or your best friend.
Coming soon on the App Store
We're putting the finishing touches on Ruby Messenger. Join the TestFlight soon and learn from your very first chat.