Couples Diary: One Line
AKIHIRO MATSUYAMA Lifestyle iPhoneiPadiPod touch
Couples Diary: One Line is a free Lifestyle app for iPhone and iPad by AKIHIRO MATSUYAMA. Requires iOS 15.0. Updated October 15, 2026.
- Price
- Free
- on the App Store
- Size
- 56 MB
- Age 4+
- Updated
- Oct 15
- 2026 · v1.1.3
Screenshots
About Couples Diary: One Line
You do not have to talk a lot every day. One line a day is something you can keep up. Couples Diary is a quiet shared diary for a partner or a spouse. [One line a day, exchanged] - You each write your line for the day - Only on a day when both of you have written does the other person's line open (writing first never puts pressure on the other) - Lines you have written can be read back quietly, later [Remember the days that matter] - Register the day you met, an anniversary, anything - A quiet word the day before - There is no limit on how many anniversaries you keep [Designed never to nudge or compare] - No reminder notifications sent to the other person - No read receipts, and no "typing" indicator [Free, with one optional purchase] - The app itself is free. Exchanging lines, anniversaries and reminders, backup export and import, text export of your record, and text size and sound settings are all free - A one-time in-app purchase (paid once, not a subscription) unlocks exporting your shared record as a PDF. The price is shown in the app before you buy, and everything above keeps working without it [Made to be safe to use] - No ads - Your line and your anniversaries travel through a server that connects the two of you, and reach only each other (no photos, no location) - No names and no accounts. All that connects you is a shared phrase Not many words. Just one a day, between the two of you. Developed by SAKURA PRODUCTS
What’s new
Version 1.1.3 · Updated October 15, 2026
• Added links to the Terms of Use and Privacy Policy on the purchase screen and in Settings. • The Today screen now shows your recent days together. • Corrected the store description to match the app (the app is free; PDF export is a one-time purchase). • On iPad, lists now use two columns with larger text. • The purchase screen now explains what stays free.
App privacy
The developer, AKIHIRO MATSUYAMA, reported these privacy practices to Apple.
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- User Content: Other User Content
- Identifiers: User ID
Used for: App Functionality
Alternatives to Couples Diary: One Line
Looking for apps like Couples Diary: One Line? Here are 6 similar apps on the App Store. The highest rated is Walk Route Generator (4.5/5), and all 6 are free to download.
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Memkeep: Shared Journal
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The Check-In: Couples Ritual
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Walk Route Generator
4.5
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マイホム - ムードボード・AIプラン・家づくり相談
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Mimori
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Towaly
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Couples Diary: One Line | – | Free | October 15, 2026 | |
| Memkeep: Shared Journal | – | Free | Aug 22, 2026 | Compare |
| The Check-In: Couples Ritual | – | Free | Aug 3, 2026 | Compare |
| Walk Route Generator | 4.5 / 5 (2) | Free | Apr 14, 2026 | Compare |
| マイホム - ムードボード・AIプラン・家づくり相談 | – | Free | Oct 5, 2026 | Compare |
| Mimori | – | Free | Oct 27, 2026 | Compare |
| Towaly | – | Free | Oct 28, 2026 | Compare |