文通日記 - AIとの交換日記
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I write in my diary and send letters to my AI pen pal. A reply arrives in 1-3 days, affixed with a seasonal stamp.
- Downloads
- 8+
- on Google Play
- Price
- Free
- No in-app purchases
- Updated
- Oct 5
- 2026 · v1.0.4
Screenshots
About 文通日記 - AIとの交換日記
Write a diary and send a letter based on that day's entry.
After a few days, you'll receive a reply from your pen pal.
You'll have four pen pals, all AI.
They are a university student, a company employee in their second year of work, a company employee raising children, and a 67-year-old who has retired.
Their lifestyles and speaking styles are different, so even if you send the same diary entry, the replies will be different.
■ For people who:
・Want to keep a diary but feel lonely because no one reads it
・Want to talk about their day with someone without worrying about what others think like on social media
・Prefer conversations with time to wait rather than instant replies in chat
・Love letters and stamps
■ What you can do:
・Write a diary (the diary remains only on this device)
・Select quotes from your diary and turn them into letters
・Attach a stamp and mail it. You can watch the process from putting it in the envelope to the postmark being applied.
・Replies arrive in 1 to 3 days. Receive notifications when a letter arrives (can be turned on or off)
* The recipient remembers what you've written in previous letters and continues the conversation.
* The recipient also has a life and will share seasonal events little by little.
* Replies will have seasonal stamps. Limited edition stamps have serial numbers.
* Collected stamps can be viewed in the stamp catalog.
* Even if you change devices, you can return your letters using the transfer code.
* Diaries can be exported to a file and imported to a new device.
■ Stamps and Coins
One stamp is required to send a letter.
Initially, you will be given coins equivalent to 5 stamps.
Coins can be obtained by viewing advertisements. Nothing can be bought with money.
■ For Safe Use
* Your pen pal is an AI. It is not a real person.
* Your diary will not leave your device. Only the letters you send (including parts of the diary you select for quotations) will reach our company.
* Replies are written by an AI on a computer managed by our company. Letters will not be sent to external AI services.
- Letters expressing distress will include links to support services.
- You can report any concerning replies from the letter screen.
- You can delete all letters from the settings.
- No account registration or login is required.
Privacy Policy: https://udoh.jp/buntsu-privacy/
After a few days, you'll receive a reply from your pen pal.
You'll have four pen pals, all AI.
They are a university student, a company employee in their second year of work, a company employee raising children, and a 67-year-old who has retired.
Their lifestyles and speaking styles are different, so even if you send the same diary entry, the replies will be different.
■ For people who:
・Want to keep a diary but feel lonely because no one reads it
・Want to talk about their day with someone without worrying about what others think like on social media
・Prefer conversations with time to wait rather than instant replies in chat
・Love letters and stamps
■ What you can do:
・Write a diary (the diary remains only on this device)
・Select quotes from your diary and turn them into letters
・Attach a stamp and mail it. You can watch the process from putting it in the envelope to the postmark being applied.
・Replies arrive in 1 to 3 days. Receive notifications when a letter arrives (can be turned on or off)
* The recipient remembers what you've written in previous letters and continues the conversation.
* The recipient also has a life and will share seasonal events little by little.
* Replies will have seasonal stamps. Limited edition stamps have serial numbers.
* Collected stamps can be viewed in the stamp catalog.
* Even if you change devices, you can return your letters using the transfer code.
* Diaries can be exported to a file and imported to a new device.
■ Stamps and Coins
One stamp is required to send a letter.
Initially, you will be given coins equivalent to 5 stamps.
Coins can be obtained by viewing advertisements. Nothing can be bought with money.
■ For Safe Use
* Your pen pal is an AI. It is not a real person.
* Your diary will not leave your device. Only the letters you send (including parts of the diary you select for quotations) will reach our company.
* Replies are written by an AI on a computer managed by our company. Letters will not be sent to external AI services.
- Letters expressing distress will include links to support services.
- You can report any concerning replies from the letter screen.
- You can delete all letters from the settings.
- No account registration or login is required.
Privacy Policy: https://udoh.jp/buntsu-privacy/
What’s new
Version 1.0.4 · Updated October 5, 2026
✉️ 日記から、AIの文通相手に手紙を出す。返事は1〜3日後、季節の切手を貼って届きます。 【今回の更新】 ・差出人の名前を決められるようになりました。返事があなたの名前あてに届きます
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