チャットTODO vs Simple Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
チャットTODO
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簡単操作でタスク管理しよう! シンプルな機能だから使い続けやすい。 TODO中にタスクの進捗や、思考を残しておけるように記録画面も用意しました。 タスク完了後や、タスク中に見直しができるようになっています。 完了タスクも一覧表示可能です。あなたの努力の成果を確認できます。 データはあなたの携帯のみ保存されているため安心して使うことができます。 使いたい機能がありましたら是非、意見をいただけると今後の開発に活かします。
Simple Diary
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Forget the pressure of writing long entries. This app makes journaling simple and fun, letting you quickly jot down a single thought, a quick feeling, or the day's highlight. It's designed to fit seamlessly into your busy life, helping you build a positive habit without the fuss. "What's on your mind today?" "How was that meeting?" "Did something make you smile?" Your one-liners become a personal timeline, a digital scrapbook of your journey. Easily look back at your entries through a clean calendar view or a simple list, and rediscover those small, significant moments that make up your unique story. It's about making mindfulness easy and accessible. If you're looking for a simple way to reflect, track your mood, or just keep a quick record of your days, the "One-Liner Journal" is perfect for you. Start capturing your story, one line at a time!
Screenshots
Verdict
The clearest difference is in-app purchases: Simple Diary at none against チャットTODO's 2. チャットTODO's advantage is update cadence (every 3 days vs every 3 months). 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. チャットTODO sells 2 one-off in-app purchases. Simple Diary asks for nothing beyond the download.
チャットTODO ships an update every 3 days, Simple Diary every 3 months. Both last shipped on October 30, 2026.
| Parameter | チャットTODO | Simple Diary |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days — better | Every 3 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 17 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Kyosuke Noguchi | Kana Uchida |
In-app purchases
チャットTODO
- 開発者への寄付$0.49
- 広告の解放$0.99
Simple Diary
No in-app purchases









