# Probability vs 优锐

The clearest difference is in-app purchases: 优锐 at none against Probability's 1. 优锐 also leads on iOS requirement (12.0 vs 14.0). Probability's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Probability sells 1 one-off in-app purchase. 优锐 asks for nothing beyond the download.

Probability ships an update every 10 days, 优锐 every 2 weeks. The most recent releases landed on October 5, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Probability | 优锐 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/probability-easy-and-practical/id1625073969/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 166 MB | 34 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Man Hung Sun](https://appshunter.io/developer/1471605573) | [明慧 陈](https://appshunter.io/developer/1535433310) |

## What reviewers say

### Probability

[App page](https://appshunter.io/ios/app/probability-easy-and-practical/id1625073969)

Enhance your decision-making skills by learning to assess probabilities with this app. It offers formulas for problem-solving, note-taking capabilities, and interactive tools like dice and coin tosses for practical learning.

**Highlights:** Probability assessment, Decision-making improvement, Problem-solving formulas, Personalized notes, Dice and coin toss simulations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade | $0.99 | one-time |


### 优锐

[App page](https://appshunter.io/ios/app/id6450949774)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Probability free?

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

### Is 优锐 free?

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

### Do Probability or 优锐 have ads?

优锐 shows ads; Probability does not.

### Which is updated more often, Probability or 优锐?

Probability ships an update every 10 days, and 优锐 every 2 weeks. Most recently, Probability was updated on October 5, 2026 and 优锐 on October 9, 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.*