# GrammarEasy vs Sobo Math

The clearest difference is update cadence: Sobo Math at every 3 days against GrammarEasy's fortnightly. Sobo Math also leads on iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. GrammarEasy sells 3 in-app purchases, starting at $0.99 per 7 days and Sobo Math sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

GrammarEasy ships an update fortnightly, Sobo Math every 3 days. Both last shipped on October 7, 2026.

## The numbers

| Metric | GrammarEasy | Sobo Math |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Size | 2 MB | 28 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yu Ngon Ng](https://appshunter.io/developer/1808370883) | [kwok wai yeung](https://appshunter.io/developer/1887192726) |

## What reviewers say

### 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 |


### Sobo Math

[App page](https://appshunter.io/ios/app/sobo-math/id6785965928)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 小學數學大冒險 | $9.99 | per month |
| PRO Yearly | $69.99 | per year |


## Frequently asked questions

### Is GrammarEasy free?

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

### Is Sobo Math free?

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

### Do GrammarEasy or Sobo Math have ads?

Neither GrammarEasy nor Sobo Math shows ads.

### Which is updated more often, GrammarEasy or Sobo Math?

GrammarEasy ships an update fortnightly, and Sobo Math every 3 days. Most recently, GrammarEasy was updated on October 7, 2026 and Sobo Math on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*