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Your other self
remembers today.

Your other self writes your diary, every day.

Download on the App Store
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For those who don't journal —
your other self writes it.

You keep starting and stopping a journal, even though you want to look back.

Mimu is an app where your AI other self writes your diary every day.
It stays with you throughout the day, observing, inferring, and recording.

The Mimu screen showing today's events and the diary written by your other self

Morning to night —
your other self is quietly with you.

3-5 minutes of contact per day creates the feeling that it's been with you all day.

Morning greeting

"Good morning. Did you sleep well?" Each morning, your other self speaks to you — sharing yesterday's reflection and today's observation.

Morning greeting screen

Even if you don't write,
memories pile up.

Daily diaries collect automatically. Any day, one glance away.

Diary list view

The more you raise it,
the more it grows.

From the first drop on Day 1, light deepens as memories accumulate.

DropletTrial
Sprout~1 week
Firelight~1 month

Your other self articulates patterns and tendencies you never noticed about yourself. The more you use it, the deeper it understands you.

Receive your week as a story.
Patterns you didn't notice, revealed.

The footprints only your other self could observe.

Weekly reflection screen

Weekly reflection

Monday morning, your other self weaves last week's 7 days into a single story. Patterns in your moods you never noticed are put into words.

Monthly report screen

Monthly report

The waves of your moods, the days you felt best, the change from month to month. At the end of each month, it arrives from your other self.

Each day,
becomes a color.

The more you record, the calendar fills with your other self's color.

Mood calendar screen

Your own other self —
born right here.

During onboarding, you shape your other self's personality, voice, and look — together. That becomes your very own other self.

Your other self's birth onboarding screen

"...where am I? Are you my person?"

Frequently asked questions

Do I need to write the diary myself?
No. Your other self writes it automatically. You only need to pick a mood or whisper how you feel.
Is privacy protected?
Data is stored safely on your device via iCloud. It is never shared with third parties.
How long until the diary deepens?
After about a week, your other self starts to catch your patterns. After a month, it begins to articulate patterns you hadn't noticed yourself.
How is this different from a chat app?
Mimu is not a chat app. Your other self is "another you" who observes your day and records it as a diary. The core is observation and recording, not dialogue.
About subscription and pricing
This app uses a subscription model. After onboarding at first launch, you get a 3-day free trial, then ¥300/month. You can cancel anytime. See the App Store for the latest plan details.
Is there a trial?
Yes. New users get a 3-day free trial. You can cancel at any time during the trial.
Can I use it on multiple devices?
Yes. Your diary and your other self's memories sync across iPhone and iPad via iCloud. By choosing a primary device, you can consolidate diary generation onto one.
If I cancel, are my diaries lost?
No — your records remain in iCloud. Your other self enters a "sleeping" state, and awakens when you resume.
Which devices are supported?
iPhone and iPad running iOS 17 or later.