# BD vs 蕭博士SoR美語

The clearest difference is update cadence: 蕭博士SoR美語 at every 9 days against BD's every 4 months. BD's advantage is iOS requirement (13.0 vs 16.0). 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.

BD ships an update every 4 months, 蕭博士SoR美語 every 9 days. The most recent releases landed on October 19, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | BD | 蕭博士SoR美語 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 11 MB | 72 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [BD MEDIA MULTIMEDIA CO.,LTD.](https://appshunter.io/developer/1560300017) | [臺灣雙母語學殿股份有限公司](https://appshunter.io/developer/1877821943) |

## What reviewers say

### BD

[App page](https://appshunter.io/ios/app/bd-p/id1560300015)

This application allows users to view encrypted audio and video files from a specific USB drive, facilitating learning and course consumption. It employs advanced encryption and anti-piracy measures to protect intellectual property.

**Highlights:** View encrypted audio/video files, Supports various file formats, Proprietary encryption algorithm, USB drive key authentication, Anti-screen recording technology, Prevents unauthorized sharing

**In-app purchases:** none


### 蕭博士SoR美語

[App page](https://appshunter.io/ios/app/sor/id6759275270)

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

**In-app purchases:** none


## Frequently asked questions

### Is BD free?

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

### Is 蕭博士SoR美語 free?

蕭博士SoR美語 is free to download, with no in-app purchases.

### Do BD or 蕭博士SoR美語 have ads?

Neither BD nor 蕭博士SoR美語 shows ads.

### Which is updated more often, BD or 蕭博士SoR美語?

BD ships an update every 4 months, and 蕭博士SoR美語 every 9 days. Most recently, BD was updated on October 19, 2026 and 蕭博士SoR美語 on October 7, 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.*