# itimestamps vs 简证

The clearest difference is update cadence: 简证 at every 2 months against itimestamps's every 17 months. 简证 also leads on iOS requirement (13.0 vs 16.4). 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.

itimestamps ships an update every 17 months, 简证 every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | itimestamps | 简证 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 2 months** |
| Size | 1 MB | 34 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [昌阳 王](https://appshunter.io/developer/1161690316) | [Hangzhou Internet Notary Public Office](https://appshunter.io/developer/1471308321) |

## What reviewers say

### itimestamps

[App page](https://appshunter.io/ios/app/itimestamps/id6449165161)

**Features:** macOS Compatibility

**In-app purchases:** none


### 简证

[App page](https://appshunter.io/ios/app/id6454675482)

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

**In-app purchases:** none


## Frequently asked questions

### Is itimestamps free?

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

### Is 简证 free?

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

### Do itimestamps or 简证 have ads?

Neither itimestamps nor 简证 shows ads.

### Which is updated more often, itimestamps or 简证?

itimestamps ships an update every 17 months, and 简证 every 2 months. Most recently, itimestamps was updated on November 3, 2026 and 简证 on November 3, 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.*