# RedCrab Calculator vs Scanlys

The clearest difference is in-app purchases: Scanlys at none against RedCrab Calculator's 1. Scanlys also leads on update cadence (every 3 days vs fortnightly). RedCrab Calculator's advantage is iOS requirement (15.6 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. RedCrab Calculator sells 1 one-off in-app purchase. Scanlys asks for nothing beyond the download.

RedCrab Calculator ships an update fortnightly, Scanlys every 3 days. The most recent releases landed on August 30, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | RedCrab Calculator | Scanlys |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | **Every 3 days** |
| Size | 4 MB | 4 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [少泽 梁](https://appshunter.io/developer/897112791) | [Kerem Gonlkrmaz](https://appshunter.io/developer/1882973074) |

## What reviewers say

### RedCrab Calculator

[App page](https://appshunter.io/ios/app/redcrab-calculator/id947845140)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 终身会员 | $1.99 | one-time |


### Scanlys

[App page](https://appshunter.io/ios/app/scanlys-document-scanner/id6760586429)

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

**In-app purchases:** none


## Frequently asked questions

### Is RedCrab Calculator free?

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

### Is Scanlys free?

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

### Do RedCrab Calculator or Scanlys have ads?

Both RedCrab Calculator and Scanlys show ads.

### Which is updated more often, RedCrab Calculator or Scanlys?

RedCrab Calculator ships an update fortnightly, and Scanlys every 3 days. Most recently, RedCrab Calculator was updated on August 30, 2026 and Scanlys on September 12, 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.*