# Flexible Ostrich vs Sum2Rush

The clearest difference is iOS requirement: Flexible Ostrich at 12.0 against Sum2Rush's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Flexible Ostrich ships an update every 3 days, Sum2Rush every 4 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | Flexible Ostrich | Sum2Rush |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 4 days |
| Size | 97 MB | 23 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [敏 胡](https://appshunter.io/developer/1647133403) | [Bartosz Paprzycki](https://appshunter.io/developer/1882313902) |

## What reviewers say

### Flexible Ostrich

[App page](https://appshunter.io/ios/app/flexible-ostrich/id6476650461)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sum2Rush

[App page](https://appshunter.io/ios/app/sum2rush-cozy-math-arcade/id6762181098)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flexible Ostrich free?

Flexible Ostrich is free to download, with no in-app purchases.

### Is Sum2Rush free?

Sum2Rush is free to download, with no in-app purchases.

### Do Flexible Ostrich or Sum2Rush have ads?

Both Flexible Ostrich and Sum2Rush show ads.

### Which is updated more often, Flexible Ostrich or Sum2Rush?

Flexible Ostrich ships an update every 3 days, and Sum2Rush every 4 days. Most recently, Flexible Ostrich was updated on October 25, 2026 and Sum2Rush on October 25, 2026.

---

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