# 恒等式 vs 豆豆计时

The clearest difference is update cadence: 豆豆计时 at daily against 恒等式's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

恒等式 ships an update fortnightly, 豆豆计时 daily. The most recent releases landed on September 11, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | 恒等式 | 豆豆计时 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Daily** |
| Size | 90 MB | 25 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Keshun Waterproof Technologies Co.,Ltd](https://appshunter.io/developer/1615344877) | [成豪 董](https://appshunter.io/developer/1584985602) |

## What reviewers say

### 恒等式

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

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

**In-app purchases:** none


### 豆豆计时

[App page](https://appshunter.io/ios/app/id6785217191)

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

**In-app purchases:** none


## Frequently asked questions

### Is 恒等式 free?

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

### Is 豆豆计时 free?

豆豆计时 is free to download, with no in-app purchases.

### Do 恒等式 or 豆豆计时 have ads?

Neither 恒等式 nor 豆豆计时 shows ads.

### Which is updated more often, 恒等式 or 豆豆计时?

恒等式 ships an update fortnightly, and 豆豆计时 daily. Most recently, 恒等式 was updated on September 11, 2026 and 豆豆计时 on September 21, 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.*