# BD vs sunKOL

The clearest difference is update cadence: sunKOL at every 2 months against BD's every 4 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.

BD ships an update every 4 months, sunKOL every 2 months. The most recent releases landed on October 2, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | BD | sunKOL |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 11 MB | 24 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BD MEDIA MULTIMEDIA CO.,LTD.](https://appshunter.io/developer/1560300017) | [SUN NET TECHNOLOGIES CO.](https://appshunter.io/developer/495082646) |

## 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


### sunKOL

[App page](https://appshunter.io/ios/app/sunkol/id6447946463)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BD free?

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

### Is sunKOL free?

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

### Do BD or sunKOL have ads?

Neither BD nor sunKOL shows ads.

### Which is updated more often, BD or sunKOL?

BD ships an update every 4 months, and sunKOL every 2 months. Most recently, BD was updated on October 2, 2026 and sunKOL on October 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.*