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The hardest part of Japanese isn't learning it.
It's knowing if you got it right — and having a reason to keep going.

That's exactly what Nihongo Diary is for. Write a diary in Japanese, get it corrected instantly, and keep going alongside other learners.

Start writing — free

N5 is enough. One sentence in hiragana counts.

No credit card needed — write your first diary today.

Today's entryN4

今日は友達と公園に行きました。天気がよくて、楽しいでした！

✓Natural rewrite

今日は友達と公園に行きました。天気がよくて、楽しかったです！

Obie: 3-day streak! Keep going 🐾

You can study Japanese for years and still freeze the moment you try to use it.

Input is everywhere — textbooks, apps, videos, flashcards. Output is the problem. The moment you try to actually produce Japanese, two things stop you:

✗1. You write something… but you have no idea if it's right. No one's there to check. So the mistake just becomes a habit.
✗2. You promise yourself you'll practice every day… and alone, you quietly stop. Not because you're lazy. Because no one's doing it with you.

This is the output wall. It isn't a talent problem or a motivation problem. It's that the one skill that matters most — output — is the one thing no app ever really helped you with.

Not another way to study. A way to finally output — and get the two things that were always missing.

A diary you can actually keep.

Write today's entry in Japanese. A sentence is enough. Type it or speak it.

Get it corrected instantly. See what was wrong, why, and how a native would say it.

Save what you learned, and keep your streak with others. Tomorrow, you do it again — and you're not doing it alone.

Five minutes a day. The output practice you could never check before — now you can.

Everything you need to output — nothing you don't.

Instant AI correction

Corrected version, natural rewrite, why-it-was-wrong, and the vocab you used. Every single entry.

The Feed

Real diaries from real learners. React, comment, follow. Learn from everyone's mistakes, not just your own.

Mistake review

The grammar you got wrong yesterday comes back today, so it actually sticks.

What Japanese learners say

“I've kept a little Japanese diary for three months — writing every day and getting it corrected. It's the best way to learn everyday words and practice grammar.”

Simone 🇩🇪

writing daily

“I'd wanted to do daily writing practice and keep a journal. This solved two problems at once.”

Matthew 🇺🇸

keeping a streak

“Such a cool idea. I love the order — original, natural rewrite, teacher's notes, key mistakes, vocab, then a practice sentence.”

Jamie 🇺🇸

diary regular

Tetsu Sensei, Japanese teacher in Sapporo

Tetsu Sensei — Japanese teacher, Sapporo

Watch how I teach on YouTube →

I'm a Japanese teacher. But before that, I was an English learner who hit the exact wall I just described.

I learned the hard way that real progress comes down to three things: input, output, repeat. Input was easy. Output was where I got stuck — because I could never check if what I produced was actually right, and alone, I always quit.

The one thing I managed to keep doing was writing a diary. And I kept thinking: if only I could record it by voice too, and if only someone could check it the moment I wrote it.

So I built the thing I always wanted — for my own students, and for every learner stuck at the same wall. A current teacher who was once a learner, making the tool he actually needed. That's Nihongo Diary.