# Probability vs Danmaku Scroll

The clearest difference is price: Probability at Free against Danmaku Scroll's $0.99. Danmaku Scroll's advantage is in-app purchases (none vs 1) and update cadence (every 4 days vs every 10 days). On ads, device support and iOS requirement there is nothing between them.

Probability is free to download; Danmaku Scroll costs $0.99 up front. Probability sells 1 one-off in-app purchase. Danmaku Scroll asks for nothing beyond the download.

Probability ships an update every 10 days, Danmaku Scroll every 4 days. Both last shipped on October 5, 2026.

## The numbers

| Metric | Probability | Danmaku Scroll |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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 | No |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 166 MB | 1 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Man Hung Sun](https://appshunter.io/developer/1471605573) | [里 万](https://appshunter.io/developer/1895966035) |

## 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 |


### Danmaku Scroll

[App page](https://appshunter.io/ios/app/danmaku-scroll/id6769600860)

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

**In-app purchases:** none


## Frequently asked questions

### Is Probability free?

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

### Is Danmaku Scroll free?

Danmaku Scroll costs $0.99, with no in-app purchases.

### Do Probability or Danmaku Scroll have ads?

Neither Probability nor Danmaku Scroll shows ads.

### Which is updated more often, Probability or Danmaku Scroll?

Probability ships an update every 10 days, and Danmaku Scroll every 4 days. Most recently, Probability was updated on October 5, 2026 and Danmaku Scroll on October 5, 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.*