# DKM vs Black Box

The clearest difference is in-app purchases: Black Box at none against DKM's 5. Black Box also leads on ads (none vs shown) and rating (4.8 vs 4.5). DKM's advantage is device support (3 vs 1). On price and iOS requirement there is nothing between them.

Both are free to download. DKM sells 5 in-app purchases, starting at $1.99 per 7 days. Black Box asks for nothing beyond the download.

Black Box holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: Black Box has 37 ratings behind it against 6, so its average is the more settled of the two.

DKM ships an update every 2 weeks, Black Box every 3 days. The most recent releases landed on September 19, 2026 and August 28, 2026 respectively.

## The numbers

| Metric | DKM | Black Box |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (6 ratings)](https://appshunter.io/ios/app/dkm-document-keeper-multipass/id6457209099/reviews) | **[4.8 (37 ratings)](https://appshunter.io/ios/app/black-box-lock-restrict-apps/id6547836962/reviews)** |
| Number of ratings | 6 | **37** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 108 MB | 68 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Duyen Tran](https://appshunter.io/developer/1691033708) | [俊涛 刘](https://appshunter.io/developer/1702439770) |

## What reviewers say

### DKM

[App page](https://appshunter.io/ios/app/dkm-document-keeper-multipass/id6457209099)

Securely manage your device's apps and sensitive documents with multiple password-protected worlds. Protect your privacy when sharing your device or lend it out without compromising your data.

**Highlights:** App management, Secure document storage, Multiple password protection, Create separate password worlds, Child device management, Confidential information protection

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium Plus | $1.99 | per 7 days |
| Weekly Premium | $3.99 | per 7 days |
| Monthly Premium | $7.99 | per month |
| Premium Monthly Plus | $7.99 | per month |
| Yearly Premium | $14.99 | per year |


### Black Box

[App page](https://appshunter.io/ios/app/black-box-lock-restrict-apps/id6547836962)

Secure your phone by locking and restricting access to sensitive applications. Protect your private data with advanced password protection and prevent unauthorized app usage or in-app purchases. Enjoy comprehensive digital privacy with an easy-to-use interface.

**Highlights:** App locking with password protection, App disappearance for hidden access, App usage restrictions, Secure privacy with advanced passwords, Payment locking for in-app purchases, Intuitive interface

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

**In-app purchases:** none


## Frequently asked questions

### Is DKM free?

DKM is free to download, with in-app purchases available.

### Is Black Box free?

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

### Which has better reviews, DKM or Black Box?

Black Box is rated higher. DKM averages 4.5 out of 5 from 6 ratings, while Black Box averages 4.8 from 37 ratings.

### Do DKM or Black Box have ads?

DKM shows ads; Black Box does not.

### Which is updated more often, DKM or Black Box?

DKM ships an update every 2 weeks, and Black Box every 3 days. Most recently, DKM was updated on September 19, 2026 and Black Box on August 28, 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.*