# Rubicon vs SumFun Kids

The clearest difference is ads: SumFun Kids at none against Rubicon's shown. Rubicon's advantage is update cadence (every 2 days vs weekly) and iOS requirement (13.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Rubicon sells 7 one-off in-app purchases and SumFun Kids sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Rubicon ships an update every 2 days, SumFun Kids weekly. The most recent releases landed on September 9, 2026 and August 23, 2026 respectively.

## The numbers

| Metric | Rubicon | SumFun Kids |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Weekly |
| Size | 698 MB | 4 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [OneTwoPlay B.V.](https://appshunter.io/developer/1707024410) | [VNIL AB](https://appshunter.io/developer/882599808) |

## What reviewers say

### Rubicon

[App page](https://appshunter.io/ios/app/rubicon-math-games/id6743382440)

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 500 Gems | $4.99 | one-time |
| Battle Pass Premium | $4.99 | one-time |
| 1000 Gems | $9.99 | one-time |
| 1500 Gems | $14.99 | one-time |
| 2000 Gems | $19.99 | one-time |
| 2500 Gems | $24.99 | one-time |
| 3000 Gems | $29.99 | one-time |


### SumFun Kids

[App page](https://appshunter.io/ios/app/sumfun-kids-math-practice/id6760265996)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Avatars | $1.99 | one-time |


## Frequently asked questions

### Is Rubicon free?

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

### Is SumFun Kids free?

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

### Do Rubicon or SumFun Kids have ads?

Rubicon shows ads; SumFun Kids does not.

### Which is updated more often, Rubicon or SumFun Kids?

Rubicon ships an update every 2 days, and SumFun Kids weekly. Most recently, Rubicon was updated on September 9, 2026 and SumFun Kids on August 23, 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.*