Comparison

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.

Head to head
About

チャットTODO

Features
Read full description

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。

About

Simple Diary

Features
Read full description

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

チャットTODO4 screens
Simple Diary2 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

チャットTODO ships an update every 3 days, Simple Diary every 3 months. Both last shipped on October 30, 2026.

Scorecard2 real differences · 4 level
チャットTODO versus Simple Diary: the parameters behind the verdict, then further details
ParameterチャットTODOSimple Diary
PriceFreeFree
Update frequencyEvery 3 days — betterEvery 3 months
AdsYesYes
In-app purchasesYesNo — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better16.6
Further details — not scored
Size17 MB8 MB
Age rating4+4+
DeveloperKyosuke NoguchiKana Uchida

In-app purchases

2 purchases

チャットTODO

One-time2
  • 開発者への寄付$0.49
  • 広告の解放$0.99
None

Simple Diary

No in-app purchases

Questions

Is チャットTODO free?
チャットTODO is free to download, with in-app purchases available.
Is Simple Diary free?
Simple Diary is free to download, with no in-app purchases.
Do チャットTODO or Simple Diary have ads?
Both チャットTODO and Simple Diary show ads.
Which is updated more often, チャットTODO or Simple Diary?
チャットTODO ships an update every 3 days, and Simple Diary every 3 months. Most recently, チャットTODO was updated on October 30, 2026 and Simple Diary on October 30, 2026.

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