# 恒等式 vs To Do List

The clearest difference is in-app purchases: 恒等式 at none against To Do List's 7. 恒等式 also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. To Do List sells 7 in-app purchases, starting at $0.49 per month. 恒等式 asks for nothing beyond the download.

恒等式 ships an update fortnightly, To Do List weekly. The most recent releases landed on September 11, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | 恒等式 | To Do List |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/to-do-list-subtasks/id6754012888/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 90 MB | 51 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Keshun Waterproof Technologies Co.,Ltd](https://appshunter.io/developer/1615344877) | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) |

## What reviewers say

### 恒等式

[App page](https://appshunter.io/ios/app/id6447490134)

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

**In-app purchases:** none


### To Do List

[App page](https://appshunter.io/ios/app/to-do-list-subtasks/id6754012888)

This app combines a calendar and to-do list for efficient task management. It provides a clear overview of daily progress and helps organize schedules, routines, and various lists. Features include fast input, calendar views, reminders, and habit tracking.

**Highlights:** Integrated calendar and to-do list, Fast task input and organization, Daily planner view, Task reminders and overdue task filtering, Repeat tasks and habit tracking, Home screen widget for quick access, Adjustable text size

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Special plan | $0.49 | per month |
| Monthly Super Saver Plan | $0.99 | per month |
| Monthly Value Plan | $0.99 | per month |
| Basic Plan | $1.99 | per month |
| 3 Month Plan | $2.99 | per 3 months |
| Half year plan (Sale) | $4.99 | per 6 months |
| Half year plan | $9.99 | per 6 months |


## Frequently asked questions

### Is 恒等式 free?

恒等式 is free to download, with no in-app purchases.

### Is To Do List free?

To Do List is free to download, with in-app purchases available.

### Do 恒等式 or To Do List have ads?

To Do List shows ads; 恒等式 does not.

### Which is updated more often, 恒等式 or To Do List?

恒等式 ships an update fortnightly, and To Do List weekly. Most recently, 恒等式 was updated on September 11, 2026 and To Do List on September 19, 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.*