こころぐ vs Inkday
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
こころぐ
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こころぐは、気持ちをそのまま残しておける場所です。 タイトルも、タグも、気分の選択もいりません。 本文だけ書けば、それでOK。 「日記は続かない」と思っている方にこそ、使ってほしいアプリです。 こころぐは、毎日書くことを求めません。 書きたくなった日に、書きたいことだけ。それで十分です。 ■ 書いた日記を、ChatGPTからも読み返せる こころぐに置いた日記は、ChatGPTからも読み返せます。 「最近どんなこと書いてたっけ」とChatGPTに聞けば、 あなたの言葉を、そっと連れてきてくれます。 書くのはこころぐで、振り返りは、ChatGPTからでも。 (連携は無料でお使いいただけます。) ■ 書くことは、ひとつだけ アプリを開くと、書く場所があるだけ。 今日のタイトルを考えたり、気分を選んだり、タグで整理したり—— そういうことは、何もしなくて大丈夫です。 思ったことを、思ったままに残せます。 ■ きれいにまとめなくても大丈夫 一行だけの日があってもいい。 まとまらないまま終わってもいい。 誰かに見せる文章ではないから、 言葉になりきらない気持ちも、そのまま置いていけます。 ■ あとから、ゆっくり読み返せる 置いておいた日記は、一覧やカレンダーから読み返せます。 「あの日、こんなこと考えてたんだ」 そんな時間が、ふとした夜にそっと戻ってきます。 ■ 写真を、そっと1枚 その日の気持ちに、写真を1枚だけ添えられます。 使わなくても大丈夫。言葉にならない日の、そっとした記録に。 ■ どんな日の気持ちでも 悲しい時も、笑える時も、なんでもない時も。 どれも大切なあなたです。 どんな気持ちも、そのまま置いていけます。 ■ こころぐ Plus について 無料でも、日記を書いて、直近30日を読み返せます。 こころぐ Plus(月額の自動更新サブスクリプション)なら、 30日より前の日記も、全期間ゆっくり読み返せます。 ■ こんな方に ・日記が三日坊主で終わってきた方 ・SNSには書けない気持ちの置き場所がほしい方 ・アプリの通知や「連続記録」に疲れた方 ・シンプルで静かな道具が好きな方 ■ 安心してお使いいただくために ・日記を書けるのは、あなただけの保存先です ・アカウントはいつでも削除できます 利用規約: https://hellokokolog.com/terms プライバシーポリシー: https://hellokokolog.com/privacy サポート: https://hellokokolog.com/support 今日の気持ちに、置き場所を。 こころぐで、お待ちしています。
Inkday
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Inkday is a private journal that's yours alone. We believe something simple: your journal is yours. Inkday runs no servers and cannot see your content. Everything — your writing, photos, videos, audio, moods, tags, location, weather, calendar snapshots, and anniversaries — is stored only in your own iCloud, syncing quietly across iPhone, iPad, and Mac through your Apple ID (activity data is the exception: it stays only on the device that captured it, and isn't synced through iCloud). No account to create, no third-party sign-in, no ads, no cross-app tracking (only anonymous device and OS-version statistics and crash reports, to improve stability). ■ Capture every day - One clean, text-first entry a day, at a glance on the calendar - Add photos, short clips, and voice notes to any entry - Tap any photo or video for a full-screen view, swipe through the day's media, pick a daily cover, or save media back to Photos or a file - Organize life with moods and tags; filter and revisit anytime - Auto-record where you were and the weather as you write (optional); search a landmark or nearby place to set where the day happened - Snapshot that day's calendar events into the entry, so you can look back even after switching calendars or phones (choose which calendars to include) - On iPhone and iPad, automatically save that day's activity from Health into the entry: active energy is free, while Inkday Pro also records steps, exercise minutes, and full workouts (type, duration, distance, pace, heart rate, and more). This stays only on the device where it was captured, not synced with the entry (can be turned off anytime) ■ Remember the days that matter - Anniversaries: record the day you got together, a birthday, or a day to count down to; Inkday works out the years, months, and days that have passed (or just the total days), or how many days remain - Reminders on day 100, 500, 1000 and every anniversary; that day is also marked in your diary, calendar, and list, and one tap adds the sentence to your entry - (iPhone, iPad, Apple Watch) Lock Screen, Home Screen, and watch face widgets show how long it's been, or how many days are left, at a glance - Import events straight from your Calendar, or turn a day's event in your diary into an anniversary - Free for up to 3 anniversaries; Inkday Pro removes the limit, adds custom colors and milestone intervals, and lets you look back on each past anniversary with On This Day ■ Look back, gently - Media calendar: browse a whole month as photo thumbnails and switch freely between List and Calendar, like an album; scroll all the way back to any past date to backfill older entries - "On This Day" brings back the same day in years past - See your writing streaks and most-used moods - A footprint map shows the places you've been ■ Built for privacy - Your data lives only in your own iCloud; the developer can't access it - No accounts, no ads, no cross-app tracking (only anonymous stability statistics) - Built-in App Lock: protect the whole app with a PIN and Face ID / Touch ID (free) ■ Your data, portable - Import from other journaling apps to move in easily - Export your entire journal to a file anytime for a full backup ■ Three platforms, one journal - Shared across iPhone, iPad, and Mac; syncs automatically with one Apple ID - Seven warm, papery themes, with dark mode (follow the system, or stay light or dark) The core is free forever, including location tagging and the footprint map. Inkday Pro unlocks extra themes, weather, calendar snapshots, full workout records, statistics, unlimited anniversaries, and export backups — available as a yearly plan, a monthly plan, or a one-time Lifetime purchase. Tired of renewing? Inkday lets you buy it once. Every day of yours deserves to be kept well. Privacy Policy: https://seanseanyin.github.io/inkday-site/privacy-policy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Inkday at weekly against こころぐ's fortnightly. Inkday also leads on device support (4 vs 2). こころぐ's advantage is iOS requirement (14.0 vs 18.0). On price, ads and in-app purchases 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. こころぐ sells 1 in-app purchase, starting at $1.99 per month and Inkday sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
こころぐ ships an update fortnightly, Inkday weekly. The most recent releases landed on October 31, 2026 and November 1, 2026 respectively.
| Parameter | こころぐ | Inkday |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPod | iPhone, iPad, Mac, Apple Watch — better |
| Requires iOS | 14.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 3 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Mimi Okumura | ChienHsiang Yin |
In-app purchases
こころぐ
- こころぐ Plus$1.991 Month
Inkday
- Inkday Pro (Monthly)$1.991 Month
- Inkday Pro (Yearly)7 Days trial$7.991 Year
- Inkday Pro (Lifetime)$14.99









