AI Diary · Japanese Wisdom
Finally understandwhat you'refeeling.
Turn your daily writing into emotional clarity — AI-powered, no pressure, beautifully designed for moments of reflection.
No streaks. No pressure. No guilt.
Your emotions deserve more than a bullet point
An AI diary that brings together voice journaling, mood tracking, and gratitude reflections — designed for daily reflection, not daily metrics.
AI Emotion Analysis
Understand your emotional landscape with AI-powered sentiment analysis that recognizes nuanced feelings across cultures.
Voice Journaling
Speak your thoughts naturally. On-device transcription keeps your words private and works offline.
Kintsugi Timeline
Your journey visualized as golden-repaired pottery. Every crack, every healing moment becomes part of your beautiful story.
Inner Landscape
A sumi-e watercolor composed from your emotional landscape — a one-of-a-kind painting generated every season, only for you.
Seasonal Themes
Experience the beauty of the four seasons with themes that adapt to spring cherry blossoms, summer festivals, autumn leaves, and winter stillness.
Haiku Mode
Express yourself in the ancient art of haiku. A mindful way to distill your day into 17 mora of pure feeling.
Privacy First
Your journal stays yours. Offline-first architecture means your entries live on your device. No one reads your heart but you.
心象 · Inner Landscape
Your emotions,
painted in ink.
Every 14 days, Kokoro Nikki composes a sumi-e watercolor from your emotional landscape — a one-of-a-kind painting that exists only for you.
- Generated from your recent entries
- Aligned with Japan's 24 micro-seasons (二十四節気)
- Yours forever — saved to your personal gallery
A landscape composed from your entries · Grain Rain · 穀雨
Journal + AI Analysis
Write freely.
Understand deeply.
Your daily entry triggers a gentle AI analysis — not a score, not a productivity metric. A reflection of the emotional landscape you're living in.
- 13 emotion categories detected
- Patterns revealed over time
- Text and voice entry
Rooted in Japanese Culture
Kokoro Nikki draws from centuries of Japanese journaling tradition. From zuihitsu (随筆) essays to seasonal awareness (kisetsukan), every detail honors the art of introspection.
Wabi-Sabi
Finding beauty in imperfection
Mono no Aware
The gentle sadness of passing things
Ichigo Ichie
Treasuring each unrepeatable moment
Kintsugi Timeline
Your scars
become gold.
Every entry is a moment in your story. The timeline connects them with golden threads — the harder the moment, the more visible the repair.
- Kintsugi gold visualization
- Seasonal theme shifts
- Haiku mode with mora counting
AI Diary App
Voice, mood, gratitude — in one quiet space
Journaling for Anxiety
Not a therapy app. A quiet space.
Mindfulness Journaling
Presence, not productivity
Gratitude Journal
Without the toxic positivity
Shadow Work Journal
Private. Offline. Unflinching.
Japanese Journaling
You don't need to speak Japanese to journal like this
Begin Your Journey
Start writing the story of your heart today.
7-day free trial. No commitment.Is Kokoro Nikki free?
We offer a 7-day free trial with full access to every feature. After the trial, a premium subscription is required to continue using the app. There are no ads.
Does it work offline?
Yes. Kokoro Nikki is offline-first: you can write entries, record voice, and browse your history without a connection. Data syncs automatically once you're back online.
How does it protect my privacy?
Voice transcription happens 100% on your device (no audio is ever sent to any server). Entries are stored locally and encrypted, and only sync with your private account. We never sell or share your data.
Which languages are supported?
Spanish, English, and Japanese — with full support for vertical writing (tategaki) and mora counting for haiku.
What does the AI do with my entries?
It analyzes emotional tone to give you insights into your mood patterns over time. The analysis is processed securely and is never used to train external models.
Can I record entries with my voice?
Yes. You can dictate your entries and the app transcribes them automatically on your device — no audio is sent to the cloud.
What happens if I stop writing for a few days?
Nothing. We don't use streaks or guilt-driven notifications. We believe in pauses and returns: your journal will be waiting for you when you need it.
Can I cancel the subscription anytime?
Yes, at any time from your App Store or Google Play account settings. You keep access until the end of the paid period.
Can I export my entries?
Yes, you can export your full journal as text from Settings to save or print it.
Who is Kokoro Nikki for?
For anyone who wants to reflect on their emotions calmly, inspired by Japanese aesthetics and philosophy (kintsugi, the seasons, haiku). No Japanese knowledge required.