O vs To Do List
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O
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チャット機能（クラウド会議室）搭載。 グループ毎に設定された担当者で会話が可能。 本アプリは、弊社システムへの円滑なログイン、チャットを目的としたアプリのため、弊社システムサービスをご利用頂いている企業向けとなります。 一度ログインすると次回よりログインの必要がありません。また、ログイン後は自動でsafariを起動し従来のシステム同様の作業が可能です。
To Do List
This app combines task management with note-taking capabilities, offering features like reminders, sorting, filtering, and synchronization with your phone's native reminder app. It provides a free basic version with optional paid features for enhanced functionality.
- Task management with reminders
- Note creation and editing
- Synchronization with phone reminders
- Sorting and filtering tasks
- Customizable accounts with colors
- Day and night interface modes
- Attaching files to tasks
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Fast and simple tasks and notes with reminders, widgets, and voice input. Add tasks and notes in seconds — by voice, widget, or one tap. No sign-up. No clutter. Just works. All your tasks stay in sync through Apple Reminders — combine iCloud, Outlook, and Exchange in one clean list. And your notes are always close at hand — for ideas, lists, plans, and important details. Free features: — Create, edit, and organize tasks and notes — Priorities, reminders, and subtasks — Voice input — Two note viewing formats — Smart sorting and filters — Dark and light mode — Home and lock screen widgets — Unlimited local accounts PRO — unlock more power: — Add by voice in one tap — File attachments — Backup and restore — App lock — Sharing and forwarding Simple enough for everyday use. Powerful enough for serious planning and quick notes. Download now and get more done — faster. Terms of Use: https://calenhub.com/task_terms_of_use.html
Screenshots
Verdict
The clearest difference is in-app purchases: O at none against To Do List's 3. O also leads on update cadence (every 3 weeks vs every 2 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. To Do List sells 3 in-app purchases, starting at $1.49 per month. O asks for nothing beyond the download.
O ships an update every 3 weeks, To Do List every 2 months. The most recent releases landed on October 26, 2026 and October 7, 2026 respectively.
| Parameter | O | To Do List |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (4 ratings) — better |
| Number of ratings | — | 4 — better |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 16 MB | 212 MB |
| Age rating | 4+ | 4+ |
| Developer | O-TECH JAPAN | Planning Technologies LLC |
In-app purchases
O
No in-app purchases
To Do List
- Full Access for a Month$1.491 Month
- Full Access for a Year7 Days trial$11.991 Year
- Full Access Forever$19.99
