# BNHMF vs HK Correctional Services Prep

The clearest difference is in-app purchases: BNHMF at none against HK Correctional Services Prep's 1. BNHMF also leads on iOS requirement (8.0 vs 15.6). HK Correctional Services Prep's advantage is update cadence (every 4 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. HK Correctional Services Prep sells 1 one-off in-app purchase. BNHMF asks for nothing beyond the download.

BNHMF ships an update every 4 months, HK Correctional Services Prep every 4 days. The most recent releases landed on October 3, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | BNHMF | HK Correctional Services Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 days** |
| Size | 19 MB | 93 MB |
| Requires iOS | **8.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hong Kong Metropolitan University](https://appshunter.io/developer/432474107) | [Pickmy AI](https://appshunter.io/developer/1869516043) |

## What reviewers say

### BNHMF

[App page](https://appshunter.io/ios/app/bnhmf/id645423551)

**Features:** macOS Compatibility

**In-app purchases:** none


### HK Correctional Services Prep

[App page](https://appshunter.io/ios/app/hk-correctional-services-prep/id6795981685)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 180-Day Pro | $19.99 | one-time |


## Frequently asked questions

### Is BNHMF free?

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

### Is HK Correctional Services Prep free?

HK Correctional Services Prep is free to download, with in-app purchases available.

### Do BNHMF or HK Correctional Services Prep have ads?

Neither BNHMF nor HK Correctional Services Prep shows ads.

### Which is updated more often, BNHMF or HK Correctional Services Prep?

BNHMF ships an update every 4 months, and HK Correctional Services Prep every 4 days. Most recently, BNHMF was updated on October 3, 2026 and HK Correctional Services Prep on October 12, 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.*