# why数理 vs Scrollie

The clearest difference is in-app purchases: why数理 at none against Scrollie's 3. why数理 also leads on iOS requirement (11.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Scrollie sells 3 in-app purchases, starting at $0.99 per month. why数理 asks for nothing beyond the download.

why数理 ships an update fortnightly, Scrollie weekly. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | why数理 | Scrollie |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (22 ratings)](https://appshunter.io/ios/app/scrollie-long-screenshot/id6757146579/reviews)** |
| Number of ratings | — | **22** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 71 MB | 51 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [靖一 陈](https://appshunter.io/developer/1529972276) | [锋 邹](https://appshunter.io/developer/1863829052) |

## What reviewers say

### why数理

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Scrollie

[App page](https://appshunter.io/ios/app/scrollie-long-screenshot/id6757146579)

Effortlessly combine screen recordings, sequential screenshots, or single images into a single, seamless long screenshot. This tool simplifies capturing and editing chat histories, social feeds, web pages, and more, with on-device processing for privacy.

**Highlights:** Stitch screen recordings into long screenshots, Combine multiple screenshots seamlessly, Annotate, mosaic, and watermark images, Smart overlap detection and cleanup, Export to JPEG, PNG, HEIC, PDF, Auto-save drafts, URL Scheme and Shortcuts integration

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Pro Yearly | $6.99 | per year |
| Lifetime Pro Access | $9.99 | one-time |


## Frequently asked questions

### Is why数理 free?

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

### Is Scrollie free?

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

### Do why数理 or Scrollie have ads?

Neither why数理 nor Scrollie shows ads.

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

why数理 ships an update fortnightly, and Scrollie weekly. Most recently, why数理 was updated on November 3, 2026 and Scrollie on November 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.*