hagu. vs Couples Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
hagu.
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hagu. は、授乳や育児の記録を できるだけ静かに続けられるように作ったアプリです。 量がわからなくても大丈夫。 記録できなかった日も、責めません。 深夜に開いても、まぶしくない。 ただ、今のあなたの隣にいられるように。 【主な機能】 ・左 / 右 / 両方を1タップで記録 ・ミルク / 搾乳 / おむつ記録 ・量の入力はすべて任意 ・深夜モード自動対応 ・静かなタイムライン ・週次レター「今週のあなたへ」
Couples Diary
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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
Screenshots
Verdict
The clearest difference is update cadence: hagu. at every 3 days against Couples Diary's every 9 days. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
hagu. ships an update every 3 days, Couples Diary every 9 days. Both last shipped on October 31, 2026.
| Parameter | hagu. | Couples Diary |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days — better | Every 9 days |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 64 MB | 56 MB |
| Age rating | 4+ | 4+ |
| Developer | TATSUYA YASUMOTO | AKIHIRO MATSUYAMA |
In-app purchases
hagu.
No in-app purchases
Couples Diary
No in-app purchases









