1日1行日記 vs Ichigyo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
1日1行日記
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毎日たった一行。それだけで、あなたの日々は特別になります。 「一行日記」は、40文字以内のひとことで1日を振り返るシンプルな日記アプリです。長い文章を書く必要はありません。今日あった嬉しかったこと、食べたもの、ふと思ったこと——たった一行で記録しましょう。 --- 主な機能 --- シンプルな日記 1日1行、40文字以内で記録。余計な機能はなく、書くことだけに集中できます。 AIイラスト生成 書いた日記から、AIが絵本風のイラストを自動生成。あなたの一行が、1枚の絵になります。 レポート&カレンダー 記録した日がひと目でわかるカレンダー表示。連続記録や総記録数を確認して、モチベーションを維持できます。 毎日のリマインダー 好きな時間に通知を設定。日記を書く習慣づくりをサポートします。 クラウド同期 Apple ID・Googleアカウントでログインすれば、データを安全にバックアップ。機種変更しても安心です。 --- こんな方におすすめ --- 日記を続けたいけど、長文は面倒な方 毎日を少しだけ振り返る習慣をつけたい方 日記にイラストを添えて、楽しく記録したい方 シンプルで使いやすいアプリが好きな方 一行から始まる、あなただけの日記。 今日の一行を、書いてみませんか?
Ichigyo
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One small entry. A day worth keeping. Ichigyo is a quiet diary for the days you want to remember, and the days when a few words are enough. Write up to 140 characters a day. A sentence, a thought, or just "Tired." Save it, and you're done. A ROOM MADE OF YOUR DAYS Your entries become monthly and weekly books in a little attic library. Read them on the bookshelf, arrange your room, and look out at a Japanese countryside view that changes from morning to night. As you record more days, furniture and animal companions become available. Past entries count, and you don't need a streak. Gifts you've earned stay available even if you delete an entry. WORDS THAT FIND YOU AGAIN Rediscover an entry from the same day a year ago. When you're just starting, entries from a week or a month ago can return first. Choose your notification time and whether the entry itself appears on your lock screen. NO STREAK TO PROTECT Missed days are simply blank. No red crosses, no broken-streak alerts. Keep the days you write, and come back whenever you like. YOUR DIARY STAYS WITH YOU Diary entries are stored on your device, without an account or automatic cloud sync. Ichigyo does not send your entries to a diary server. Export them as TXT or CSV for free. An optional paid unlock adds password-protected backup export for moving your diary to another device. READ, KEEP, AND SHARE - Browse your calendar, entry list, monthly books, and weekly books. - Revisit the same date across different years. - Save a favorite entry as a poem card, with horizontal or vertical text. - Turn your room, bookshelf, scenery, or keepsake into a wallpaper image. - See a year at a glance and export an image. - Add a widget, with control over whether diary text is shown. OPTIONAL ONE-TIME PURCHASES Writing, basic reading, notifications, TXT/CSV export, and the basic room remain free. No ads or subscriptions. Unlock Journal Features adds four writing themes, app lock with Face ID or device passcode, access to all years in On This Day, A6 PDF books, encrypted backup export, and an alternate app icon. Room and scenery packs are separate purchases: - Lamplit Study: walnut furniture, warm lighting, and decor. - Seaside Window: a seaside view; furniture is not included. - Lakeside Cabin: a lake view, oak furniture, and lakeside decor. - Rainy Street Study: a rainy streetscape, furniture finishes, and decor. - Forest Greenhouse: a garden and greenhouse view, furniture finishes, and decor. - Halloween Study, Christmas Night, and New Year Room: seasonal interiors and decorations, offered during their sale periods. Purchased seasonal items remain usable year-round. Room packs do not include Unlock Journal Features, and that unlock does not include room packs. Companions and diary rewards are earned through recorded days. The scenery and sky use Japan time and a Tokyo-based sky. They do not follow your location or the actual weather. Rainy Street Study and Forest Greenhouse include seasonal scenery changes. JAPANESE AND ENGLISH Use the same app in Japanese or English. Your own entries stay exactly as you wrote them, in any language. A few words today. A little of your life to return to.
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Verdict
The clearest difference is in-app purchases: 1日1行日記 at none against Ichigyo's 9. 1日1行日記 also leads on update cadence (weekly vs every 3 weeks). On price, ads, device support and iOS requirement 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. Ichigyo sells 9 one-off in-app purchases. 1日1行日記 asks for nothing beyond the download.
1日1行日記 ships an update weekly, Ichigyo every 3 weeks. The most recent releases landed on October 28, 2026 and October 29, 2026 respectively.
| Parameter | 1日1行日記 | Ichigyo |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 271 MB |
| Age rating | 4+ | 4+ |
| Developer | Rikuto Sato | Ryo Uejima |
In-app purchases
1日1行日記
No in-app purchases
Ichigyo
- Lamplit Study$3.59
- Seaside Window$3.59
- Lakeside Cabin$3.59
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- New Year Room$3.59
- Forest Greenhouse$3.59
- Halloween Study$3.59
- Christmas Night$3.59
- Rainy Street Study$3.59
- Unlock Journal Features$4.99









