# KooSai vs RisRoll | Саратов и Энгельс

The clearest difference is update cadence: KooSai at every 11 days against RisRoll | Саратов и Энгельс's every 8 months. KooSai also leads on iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

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

KooSai ships an update every 11 days, RisRoll | Саратов и Энгельс every 8 months. The most recent releases landed on September 18, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | KooSai | RisRoll | Саратов и Энгельс |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 8 months |
| Size | 51 MB | 39 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vladimir Krtyan](https://appshunter.io/developer/957393820) | [Igor Zharnikov](https://appshunter.io/developer/1495948427) |

## What reviewers say

### KooSai

[App page](https://appshunter.io/ios/app/koosai/id6503903595)

**In-app purchases:** none


### RisRoll | Саратов и Энгельс

[App page](https://appshunter.io/ios/app/risroll/id6742786980)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is KooSai free?

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

### Is RisRoll | Саратов и Энгельс free?

RisRoll | Саратов и Энгельс is free to download, with no in-app purchases.

### Do KooSai or RisRoll | Саратов и Энгельс have ads?

Neither KooSai nor RisRoll | Саратов и Энгельс shows ads.

### Which is updated more often, KooSai or RisRoll | Саратов и Энгельс?

KooSai ships an update every 11 days, and RisRoll | Саратов и Энгельс every 8 months. Most recently, KooSai was updated on September 18, 2026 and RisRoll | Саратов и Энгельс on September 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.*