# 一年级数学认方向 vs Cat Probability Roulette

The clearest difference is in-app purchases: 一年级数学认方向 at none against Cat Probability Roulette's 1. 一年级数学认方向 also leads on ads (none vs shown) and iOS requirement (10.0 vs 15.0). Cat Probability Roulette's advantage is update cadence (every 2 months vs every 9 months). On price and device support there is nothing between them.

Both are free to download. Cat Probability Roulette sells 1 one-off in-app purchase. 一年级数学认方向 asks for nothing beyond the download.

一年级数学认方向 ships an update every 9 months, Cat Probability Roulette every 2 months. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 一年级数学认方向 | Cat Probability Roulette |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 2 months** |
| Size | 37 MB | 138 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [涛 陈](https://appshunter.io/developer/1509220765) | [Yusuke Okada](https://appshunter.io/developer/1793725878) |

## What reviewers say

### 一年级数学认方向

[App page](https://appshunter.io/ios/app/id1037687865)

**Features:** macOS Compatibility

**In-app purchases:** none


### Cat Probability Roulette

[App page](https://appshunter.io/ios/app/cat-probability-roulette/id6754866024)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.49 | one-time |


## Frequently asked questions

### Is 一年级数学认方向 free?

一年级数学认方向 is free to download, with no in-app purchases.

### Is Cat Probability Roulette free?

Cat Probability Roulette is free to download, with in-app purchases available.

### Do 一年级数学认方向 or Cat Probability Roulette have ads?

Cat Probability Roulette shows ads; 一年级数学认方向 does not.

### Which is updated more often, 一年级数学认方向 or Cat Probability Roulette?

一年级数学认方向 ships an update every 9 months, and Cat Probability Roulette every 2 months. Most recently, 一年级数学认方向 was updated on October 26, 2026 and Cat Probability Roulette on October 28, 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.*