# why数理 vs UCloud

The clearest difference is iOS requirement: why数理 at 11.0 against UCloud's 15. 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.

why数理 ships an update fortnightly, UCloud monthly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | why数理 | UCloud |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Size | 71 MB | 36 MB |
| Requires iOS | **11.0** | 15 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [靖一 陈](https://appshunter.io/developer/1529972276) | [UCloud Technology Co., Ltd.](https://appshunter.io/developer/1563863774) |

## What reviewers say

### why数理

[App page](https://appshunter.io/ios/app/why/id1539375758)

**Features:** macOS Compatibility

**In-app purchases:** none


### UCloud

[App page](https://appshunter.io/ios/app/ucloud/id1607278245)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is why数理 free?

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

### Is UCloud free?

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

### Do why数理 or UCloud have ads?

Neither why数理 nor UCloud shows ads.

### Which is updated more often, why数理 or UCloud?

why数理 ships an update fortnightly, and UCloud monthly. Most recently, why数理 was updated on November 3, 2026 and UCloud on October 30, 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.*