Kokoro Nikki is an AI-powered diary that understands how you feel. Speak or write your thoughts, and let voice journaling and emotion analysis help you make sense of your day. A calm, beautifully crafted space for daily reflection — with a Japanese soul, designed for modern minds.

WHY KOKORO NIKKI

Whether you're new to journaling or have kept a diary for years, Kokoro Nikki gives you a gentle, judgment-free space to capture what matters. No streaks. No guilt. Just a quiet ritual that meets you where you are.

FEATURES

• AI emotion analysis — understand your moods and feelings, day by day
• Voice journaling — speak your thoughts, we transcribe them privately
• Mood tracker — see your emotional patterns over time
• Daily reflection prompts — gentle, judgment-free guidance
• Haiku mode — capture your day in a 5-7-5 rhythm
• Kintsugi timeline — a beautiful, intentional view of your journey
• Interior Landscape — a unique watercolor that emerges from your words
• Seasonal themes — the app changes with sakura, summer, autumn leaves, and winter
• Offline-first — your entries stay on your device
• Privacy-focused — your journal is yours alone

A QUIET RITUAL, EVERY DAY

Most journals ask you to perform. Kokoro Nikki invites you to listen. Use voice journaling to speak freely, then let AI emotion analysis surface the patterns you might miss. Watch your reflections become a kintsugi timeline — a story made richer by every crack and every repair.

PRIVACY FIRST

Your thoughts stay yours. Entries are stored locally on your device by default. Voice transcription runs on-device. AI emotion analysis happens through secure channels, and your journal is never shared, sold, or used to train models.

FREE TRIAL & PREMIUM

Kokoro Nikki offers a 7-day free trial with full access to every feature. After the trial, a subscription is required to keep using the app. Premium includes voice journaling, AI emotion analysis, kintsugi timeline, haiku mode, interior landscape, seasonal themes, and unlimited entries.

An account is required to use the app. All journal entries remain stored locally on your device.

The diary that listens — your daily AI journal for mood tracking, voice notes, and gentle self-reflection.

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Terms of Service: https://kokoro-nikki.com/terms
Privacy Policy: https://kokoro-nikki.com/privacy