# S vs Aha! Math

The clearest difference is ads: Aha! Math at none against S's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. S sells 3 in-app purchases, starting at $1.99 per month and Aha! Math sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

S ships an update every 4 days, Aha! Math weekly. Both last shipped on October 31, 2026.

## The numbers

| Metric | S | Aha! Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/s-rootwords-learn-vocabulary/id6757831810/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | Free with in-app purchases | — |
| Size | 82 MB | 102 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sang Ngo](https://appshunter.io/developer/1859892801) | [Hiroshi Matsumoto](https://appshunter.io/developer/1764881505) |

## What reviewers say

### S

[App page](https://appshunter.io/ios/app/s-rootwords-learn-vocabulary/id6757831810)

Master English vocabulary by understanding the logic of root words. This app uses visual aids and spaced repetition to help you learn thousands of words and track your progress.

**Highlights:** Root word learning method, Visual imagination images, Spaced repetition flashcards, Vocabulary tree exploration, Progress tracking garden

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hàng tháng | $1.99 | per month |
| Hàng năm | $9.99 | per year |
| Trọn đời | $19.99 | one-time |


### Aha! Math

[App page](https://appshunter.io/ios/app/aha-math-word-problems/id6807239709)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| 3 Months | $4.99 | per 3 months |
| 6 Months | $9.99 | per 6 months |
| Annual | $14.99 | per year |


## Frequently asked questions

### Is S free?

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

### Is Aha! Math free?

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

### Do S or Aha! Math have ads?

S shows ads; Aha! Math does not.

### Which is updated more often, S or Aha! Math?

S ships an update every 4 days, and Aha! Math weekly. Most recently, S was updated on October 31, 2026 and Aha! Math 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.*