# Phy vs ctstris

The clearest difference is iOS requirement: Phy at 13.0 against ctstris's 15.0. 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.

## The numbers

| Metric | Phy | ctstris |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 54 months | — |
| Size | 2 MB | 0 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Krishna Raj Salim](https://appshunter.io/developer/1638689285) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## What reviewers say

### Phy

[App page](https://appshunter.io/ios/app/phy-stack/id949127355)

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

**In-app purchases:** none


### ctstris

[App page](https://appshunter.io/ios/app/ctstris/id6475251381)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Phy free?

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

### Is ctstris free?

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

### Do Phy or ctstris have ads?

Neither Phy nor ctstris shows ads.

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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.*