Concept Features FAQ 日本語 한국어 中文

Your other self
remembers today.

Your alter ego writes your diary, every single day.

Scroll to explore

For you who don't write diaries,
your alter ego will.

You've tried starting a diary many times, but it never sticks.

Mimu is an app where your AI alter ego writes your diary for you.
Your alter ego stays by your side all day, observing, inferring, and recording your day.

Watching over your day

Your alter ego stays quietly by your side, from morning to night.

Morning greeting

"Good morning. Did you sleep well?" Every morning, your alter ego speaks to you — reflecting on yesterday and sharing today's insights.

Inner voice

When you murmur "I'm tired...", your alter ego gently responds in its heart. It empathizes with your feelings while gathering material for your diary.

Evening diary

At the end of the day, your alter ego completes your diary. From your murmurs, moods, and actions, a diary unique to that day is born.

The more you nurture it, the more you understand yourself.

As memories accumulate, your diary gains deeper insight.

›
›
Day 1 Day 100

Your alter ego articulates patterns and tendencies you never noticed about yourself. The more you use it, the deeper your alter ego understands you.

Key screens

Good morning. Did you sleep well?
Inner voice arriving
What's on your mind...
Murmurs
Share your feelings with your alter ego
Day 15
It was a little chilly this morning. You went out lightly dressed but seemed to regret it halfway through. "Cold..." you murmured. Lunch at the usual café.
Diary
Read today's diary written by your alter ego
March
Calendar
See your mood trends at a glance

What people are saying

"I've never kept a diary before, but before I knew it, I was on day 30."

— 28, Office worker

"It feels like it understands me better than I understand myself."

— 34, Freelancer

"I look forward to the morning greeting so much that I naturally started waking up early."

— 22, University student

Frequently asked questions

Do I need to write the diary myself?
No. Your alter ego writes it automatically. All you do is choose your mood or murmur your thoughts.
Is my privacy protected?
Your data is securely stored on your device via iCloud. Your data is never shared with third parties.
How long until the diary gets deeper?
After about a week, your alter ego starts to grasp your tendencies. After a month, it begins to articulate patterns you never noticed about yourself.
How is this different from a chat app?
Mimu is not a chat app. Your alter ego observes your day as "your other self" and records it as a diary. It's centered on observation and recording, not conversation.
Does it cost anything?
Basic features are free. Advanced features are available through a subscription.
What devices are supported?
Compatible with iPhone and iPad running iOS 17 or later.