# 公证IDC vs 青灯墨屏

The clearest difference is update cadence: 青灯墨屏 at weekly against 公证IDC's every 2 months. 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.

公证IDC ships an update every 2 months, 青灯墨屏 weekly. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 公证IDC | 青灯墨屏 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Size | 16 MB | 14 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [北京慧阅信息服务有限公司](https://appshunter.io/developer/1042164948) | [泽轩 王](https://appshunter.io/developer/1896517884) |

## What reviewers say

### 公证IDC

[App page](https://appshunter.io/ios/app/idc/id1184796980)

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

**In-app purchases:** none


### 青灯墨屏

[App page](https://appshunter.io/ios/app/id6768019222)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 公证IDC free?

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

### Is 青灯墨屏 free?

青灯墨屏 is free to download, with no in-app purchases.

### Do 公证IDC or 青灯墨屏 have ads?

Neither 公证IDC nor 青灯墨屏 shows ads.

### Which is updated more often, 公证IDC or 青灯墨屏?

公证IDC ships an update every 2 months, and 青灯墨屏 weekly. Most recently, 公证IDC was updated on November 6, 2026 and 青灯墨屏 on October 31, 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.*