# Add & Subtract vs Happy Learn 香港

The clearest difference is in-app purchases: Happy Learn 香港 at none against Add & Subtract's 1. Happy Learn 香港 also leads on update cadence (monthly vs every 44 months) and iOS requirement (15.6 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Add & Subtract sells 1 one-off in-app purchase. Happy Learn 香港 asks for nothing beyond the download.

Add & Subtract ships an update every 44 months, Happy Learn 香港 monthly. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Add & Subtract | Happy Learn 香港 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/add-and-subtract-xiaopack/id488652832/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 44 months | **Monthly** |
| Monetization | Free | — |
| Size | 55 MB | 34 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [丽东 陈](https://appshunter.io/developer/1342184783) | [Johnny Tam](https://appshunter.io/developer/1516654587) |

## What reviewers say

### Add & Subtract

[App page](https://appshunter.io/ios/app/add-and-subtract-xiaopack/id488652832)

This app helps young children develop an interest in mathematics through interactive games. It uses visual aids and engaging scenes to teach basic addition and subtraction concepts, reinforcing learning with positive feedback.

**Highlights:** Interactive learning scenes, Visual representation of numbers, Addition and subtraction practice, Positive reinforcement for correct answers, Engaging animal characters

**Features:** macOS Compatibility, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Three Worlds | $1.99 | one-time |


### Happy Learn 香港

[App page](https://appshunter.io/ios/app/happy-learn/id6749908358)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Add & Subtract free?

Add & Subtract is free to download, with in-app purchases available.

### Is Happy Learn 香港 free?

Happy Learn 香港 is free to download, with no in-app purchases.

### Do Add & Subtract or Happy Learn 香港 have ads?

Neither Add & Subtract nor Happy Learn 香港 shows ads.

### Which is updated more often, Add & Subtract or Happy Learn 香港?

Add & Subtract ships an update every 44 months, and Happy Learn 香港 monthly. Most recently, Add & Subtract was updated on November 6, 2026 and Happy Learn 香港 on October 30, 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.*