# 象牙塔教师版 vs BMD数字证书

The clearest difference is update cadence: 象牙塔教师版 at every 2 weeks against BMD数字证书's every 4 months. BMD数字证书's advantage is iOS requirement (8.0 vs 11.0). 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.

象牙塔教师版 ships an update every 2 weeks, BMD数字证书 every 4 months. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | 象牙塔教师版 | BMD数字证书 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 months |
| Monetization | — | Free |
| Size | 49 MB | 12 MB |
| Requires iOS | 11.0 | **8.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Beijing Xiangyata GridSafety InfoTech Co., Ltd.](https://appshunter.io/developer/1375878925) | [Shanghai F-road Commerce Service Co.,Ltd](https://appshunter.io/developer/561883025) |

## What reviewers say

### 象牙塔教师版

[App page](https://appshunter.io/ios/app/id1375878926)

**In-app purchases:** none


### BMD数字证书

[App page](https://appshunter.io/ios/app/bmd/id1619735633)

Manage your thin film hardware digital certificates with this tool. It offers efficient, convenient, and professional management for signing, password changes, and COS operations.

**Highlights:** Hardware digital certificate management, Signing management, Password management, COS management, Efficient and convenient tool, Simple operation

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 象牙塔教师版 free?

象牙塔教师版 is free to download, with no in-app purchases.

### Is BMD数字证书 free?

BMD数字证书 is free to download, with no in-app purchases.

### Do 象牙塔教师版 or BMD数字证书 have ads?

Neither 象牙塔教师版 nor BMD数字证书 shows ads.

### Which is updated more often, 象牙塔教师版 or BMD数字证书?

象牙塔教师版 ships an update every 2 weeks, and BMD数字证书 every 4 months. Most recently, 象牙塔教师版 was updated on October 16, 2026 and BMD数字证书 on October 17, 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.*