# HK P.4 Math vs GrammarEasy

The clearest difference is update cadence: GrammarEasy at monthly against HK P.4 Math's every 9 months. HK P.4 Math's advantage is iOS requirement (9.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. HK P.4 Math sells 1 one-off in-app purchase and GrammarEasy sells 3 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

HK P.4 Math ships an update every 9 months, GrammarEasy monthly. The most recent releases landed on October 26, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | HK P.4 Math | GrammarEasy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Monthly** |
| Size | 5 MB | 2 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yik Lam Leung](https://appshunter.io/developer/1215582728) | [Yu Ngon Ng](https://appshunter.io/developer/1808370883) |

## What reviewers say

### HK P.4 Math

[App page](https://appshunter.io/ios/app/hk-p4-math/id1454251214)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HK P.4 Math(Full Version) | $0.99 | one-time |


### GrammarEasy

[App page](https://appshunter.io/ios/app/grammareasy/id6777962466)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Weekly) | $0.99 | per 7 days |
| Premium(6 Months ) | $17.99 | per 6 months |
| Premium(Annual) | $29.99 | per year |


## Frequently asked questions

### Is HK P.4 Math free?

HK P.4 Math is free to download, with in-app purchases available.

### Is GrammarEasy free?

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

### Do HK P.4 Math or GrammarEasy have ads?

Neither HK P.4 Math nor GrammarEasy shows ads.

### Which is updated more often, HK P.4 Math or GrammarEasy?

HK P.4 Math ships an update every 9 months, and GrammarEasy monthly. Most recently, HK P.4 Math was updated on October 26, 2026 and GrammarEasy on October 31, 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.*