# HK vs Master Flash® Calculator

The clearest difference is update cadence: Master Flash® Calculator at weekly against HK's monthly. HK's advantage is iOS requirement (8.0 vs 12.0). 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.

HK ships an update monthly, Master Flash® Calculator weekly. The most recent releases landed on October 3, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | HK | Master Flash® Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (6 ratings)](https://appshunter.io/ios/app/hk-fly/id1318154793/reviews)** | — |
| Number of ratings | **6** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free | — |
| Size | 134 MB | 33 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Joyhonest Technology Co., Ltd](https://appshunter.io/developer/1472724044) | [Aztec International S.A.](https://appshunter.io/developer/1726986799) |

## What reviewers say

### HK

[App page](https://appshunter.io/ios/app/hk-fly/id1318154793)

Control a four-axis aircraft remotely using your phone. View real-time video from the aircraft's camera and capture photos or videos directly to your device. Features like optical flow ensure stable flight.

**Highlights:** Remote aircraft control via Wi-Fi, Real-time video streaming, Photo and video recording, Optical flow for stable flight, Gesture control for photos

**In-app purchases:** none


### Master Flash® Calculator

[App page](https://appshunter.io/ios/app/master-flash-calculator/id6476518905)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HK free?

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

### Is Master Flash® Calculator free?

Master Flash® Calculator is free to download, with no in-app purchases.

### Do HK or Master Flash® Calculator have ads?

Neither HK nor Master Flash® Calculator shows ads.

### Which is updated more often, HK or Master Flash® Calculator?

HK ships an update monthly, and Master Flash® Calculator weekly. Most recently, HK was updated on October 3, 2026 and Master Flash® Calculator 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.*