# ToDo Calendar Pro vs OneTodo

The clearest difference is review sentiment: OneTodo at 71% against ToDo Calendar Pro's 20%. OneTodo also leads on ads (none vs shown) and update cadence (every 9 days vs every 2 months). ToDo Calendar Pro's advantage is rating (4.2 vs 2.3) and monetization model (free with in-app purchases vs subscription). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. ToDo Calendar Pro sells 1 one-off in-app purchase and OneTodo sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ToDo Calendar Pro holds the better App Store score, 4.2 against 2.3. Both are backed by a comparable volume of ratings — 5 and 3 respectively. Written reviews complicate that: 20% of ToDo Calendar Pro's written reviews are positive against 71% of OneTodo's, so the app with the better star average is not the one people write more warmly about.

ToDo Calendar Pro ships an update every 2 months, OneTodo every 9 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ToDo Calendar Pro | OneTodo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/todo-calendar-pro/id1485076112/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/onetodo-personal-task-system/id1546530435/reviews) |
| Number of ratings | **5** | 3 |
| Positive reviews | 20.0% of reviews | **71.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 9 days** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 33 MB | 140 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [NAOAKI SEKIGUCHI](https://appshunter.io/developer/1146328819) | [Chengdu Reinvent Technology Co., Ltd.](https://appshunter.io/developer/1250290964) |

## What reviewers say

### ToDo Calendar Pro

[App page](https://appshunter.io/ios/app/todo-calendar-pro/id1485076112)

Manage your tasks efficiently with a calendar view that shows due dates. Sync tasks across all your devices via iCloud and automatically register them to other calendar apps. Attach files, create sub-tasks, and receive timely notifications.

**Highlights:** Calendar task overview, iCloud task synchronization, File and photo attachments, Sub-task creation, Template-based task registration, Integration with iOS Calendar and Google Calendar, Apple Watch task viewing

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ToDo Calendar Pro License | $1.99 | one-time |


### OneTodo

[App page](https://appshunter.io/ios/app/onetodo-personal-task-system/id1546530435)

Organize your life with a hierarchical task management system. Create tasks, pages, projects, boxes, and spaces to structure your to-do list and plans. Track project progress and manage separate data spaces for different aspects of your life.

**Highlights:** Hierarchical task organization (Task > Page > Project > Box > Space), Create standalone tasks, Use pages as project subtitles, Track project completion progress, Group projects with boxes, Separate data spaces for internal accounts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OneTodo Pro (Monthly) | $0.99 | per month |
| OneTodo Pro (Yearly) | $6.99 | per year |
| OneTodo Pro (Lifetime) | $14.99 | one-time |


## Frequently asked questions

### Is ToDo Calendar Pro free?

ToDo Calendar Pro is free to download, with in-app purchases available.

### Is OneTodo free?

OneTodo is free to download, with in-app purchases available.

### Which has better reviews, ToDo Calendar Pro or OneTodo?

ToDo Calendar Pro is rated higher. ToDo Calendar Pro averages 4.2 out of 5 from 5 ratings, while OneTodo averages 2.3 from 3 ratings.

### Do ToDo Calendar Pro or OneTodo have ads?

ToDo Calendar Pro shows ads; OneTodo does not.

### Which is updated more often, ToDo Calendar Pro or OneTodo?

ToDo Calendar Pro ships an update every 2 months, and OneTodo every 9 days. Most recently, ToDo Calendar Pro was updated on October 23, 2026 and OneTodo on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*