# 忘忧信箱 vs CheckMate

The clearest difference is iOS requirement: CheckMate at 13 against 忘忧信箱's 16.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

忘忧信箱 ships an update monthly, CheckMate every 3 weeks. The most recent releases landed on October 10, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | 忘忧信箱 | CheckMate |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 35 MB | 116 MB |
| Requires iOS | 16.0 | **13** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [鹏 张](https://appshunter.io/developer/1276467599) | [Chengdu Kamang Network Technology Co., LTD](https://appshunter.io/developer/1823225877) |

## What reviewers say

### 忘忧信箱

[App page](https://appshunter.io/ios/app/id1276467600)

**In-app purchases:** none


### CheckMate

[App page](https://appshunter.io/ios/app/checkmate/id6747891089)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 忘忧信箱 free?

忘忧信箱 is free to download, with no in-app purchases.

### Is CheckMate free?

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

### Do 忘忧信箱 or CheckMate have ads?

Neither 忘忧信箱 nor CheckMate shows ads.

### Which is updated more often, 忘忧信箱 or CheckMate?

忘忧信箱 ships an update monthly, and CheckMate every 3 weeks. Most recently, 忘忧信箱 was updated on October 10, 2026 and CheckMate on October 4, 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.*