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App Store Apps > Lifestyle > One Good Deed – Kindness Diary
One Good Deed – Kindness Diary icon

One Good Deed – Kindness Diary

by KOHEI MITSUI · Lifestyle · Free
On the App Store since August 2026 · Data updated 2026-10-24

One Good Deed – Kindness Diary is made and published by KOHEI MITSUI. AppBrain is an independent app data site and isn't affiliated with KOHEI MITSUI. The app name, icon, screenshots and description belong to KOHEI MITSUI and are shown as published on the App Store.

AppBrain's verdict

Last updated
September 11, 2026
Official page on the App Store

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Releases

Updates seen on the App Store
Version
1.0.1
Launched
August 2026

No changelog data

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Technology

Found in the app by AppBrain
Price
Free
App size
44.2 MB
Content rating
Everyone

Technologies used by One Good Deed – Kindness Diary

About the app and developer

About One Good Deed – Kindness Diary

One Good Deed – Kindness Diary is a lifestyle app developed by KOHEI MITSUI.

User Ratings

The app has no ratings yet.

App Information

One Good Deed – Kindness Diary is freely available from the App Store. The app size is 44.22 MB. The latest version available is 1.0.1. The last update was on September 11, 2026.

Technical Requirements

The app has a content rating of Everyone. The app has been available on the App Store since August 2026.

Developer information for KOHEI MITSUI

KOHEI MITSUI

Address:

Frequently asked questions about One Good Deed – Kindness Diary

Is One Good Deed – Kindness Diary free?

Yes. One Good Deed – Kindness Diary is free on the App Store.

Is One Good Deed – Kindness Diary still available?

Yes. One Good Deed – Kindness Diary is on the App Store, and the last update we saw was on September 11, 2026.

How large is One Good Deed – Kindness Diary?

One Good Deed – Kindness Diary is 44.22 MB.

Is One Good Deed – Kindness Diary suitable for children?

App Store rates the content of One Good Deed – Kindness Diary as suitable for everyone.

Who made One Good Deed – Kindness Diary?

One Good Deed – Kindness Diary was developed by KOHEI MITSUI. It is listed in the lifestyle category on the App Store.

What are the best alternatives to One Good Deed – Kindness Diary?

People looking at One Good Deed – Kindness Diary also look at these lifestyle apps: Confeli, CaseNote, ありがとう記録, オタ活日記, 理想の街を見つける診断アプリ - MatchTowns.

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Store listing

By KOHEI MITSUI, from the App Store
One Good Deed – Kindness Diary Screenshot 1 of 5
One Good Deed – Kindness Diary Screenshot 2 of 5
One Good Deed – Kindness Diary Screenshot 3 of 5
One Good Deed – Kindness Diary Screenshot 4 of 5
One Good Deed – Kindness Diary Screenshot 5 of 5
Screenshots by KOHEI MITSUI, from the the App Store listing
Description by KOHEI MITSUI Written by the developer, not by AppBrain. Click to read.
One Good Deed is a diary for one small kind thing a day — and only one.

You gave up your seat. You picked up a piece of litter. You said a real thank-you.
Small things are exactly the ones you forget if you don't write them down.

■ One a day, thirty seconds
You can only write today's entry, and only up to 100 characters, so you finish before you can overthink it.
Add hashtags and you can look back later at what kind of good things you did most.

■ A mark lights up your calendar
Every day you write lights a mark. The further the month goes, the fuller your calendar gets.
The mark follows your palette: cherry blossom in spring, new leaves in summer, autumn leaves in autumn, snow in winter. (Choosing among the four, and having it follow the season automatically, are part of Pro.)

■ Your streak stays with you
Current and longest streaks and your all-time total are counted for you.
Three days, seven, fourteen — reach a milestone and the app celebrates with you.

■ Recap
The month's count and your current, longest, and all-time figures are free.
The breakdown by hashtag, your streak milestones, and every past month are part of Pro.

■ For the days nothing comes to mind
Pick from 30 suggestions. The one you choose fills in the entry and adds a category tag.

■ Also
- One optional reminder a day, at a time you choose (free)
- Choose your palette (and the calendar mark that goes with it) from the four seasons, or have it follow the season automatically — both are part of Pro
- Export and import your entries as JSON (Pro)
- Japanese and English

■ Privacy
The text of your entries and your hashtags are stored only on your device and are never sent to a server.
No account is required. There are no ads.
The app does send anonymous usage statistics to help us improve it: which features were used, along with a few setting values such as the fact that you turned the reminder on and the time you set it to.
It never includes the text of your entries or the content of your hashtags.

■ About One Good Deed Pro
Writing your entry, reading back any past day from the calendar, the daily reminder, and sharing an entry are all free. Nothing you need in order to keep the habit is behind the paywall.

Pro unlocks five things:
- The whole recap (breakdown by hashtag, streak milestones, and every past month)
- Unlimited hashtags (the free plan allows three)
- Seasonal palettes and app icons to choose from (or set to follow the season)
- Dark mode
- Export and import your entries as JSON

- Available as a monthly or a yearly subscription. Your local price is shown in the app before you purchase, and in the In-App Purchases section of this page.
- Payment is charged to your Apple ID account at confirmation of purchase.
- Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period.
- Your account is charged for renewal within 24 hours prior to the end of the current period.
- You can manage and cancel your subscription in Settings > Apple ID > Subscriptions on your iPhone.
- Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
- Privacy Policy: https://tempuraapps.github.io/ichinichiichizen/en/privacy.html
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