# RedCrab Calculator vs Pearnotes

The clearest difference is in-app purchases: Pearnotes at none against RedCrab Calculator's 1. Pearnotes also leads on ads (none vs shown). RedCrab Calculator's advantage is iOS requirement (15.6 vs 17.6). On price, update cadence and device support there is nothing between them.

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

RedCrab Calculator ships an update fortnightly, Pearnotes every 10 days. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | RedCrab Calculator | Pearnotes |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 7 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [少泽 梁](https://appshunter.io/developer/897112791) | [Braveyo LLC](https://appshunter.io/developer/1855102831) |

## What reviewers say

### RedCrab Calculator

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

This powerful scientific calculator offers a modern UI and robust engine for users of all levels. It handles basic arithmetic to complex engineering equations with smart expression parsing and a high-precision display. Enjoy a seamless calculation experience with features like history recall and dark mode.

**Highlights:** Basic & Advanced Calculations, Smart Expression Parsing, Calculation History & Reuse, High-Precision Display, Dark Mode & Modern UI, VIP Ad-Free Experience

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

**In-app purchases (1)**

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


### Pearnotes

[App page](https://appshunter.io/ios/app/pearnotes/id6755762098)

**Features:** 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 Pearnotes free?

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

### Do RedCrab Calculator or Pearnotes have ads?

RedCrab Calculator shows ads; Pearnotes does not.

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

RedCrab Calculator ships an update fortnightly, and Pearnotes every 10 days. Most recently, RedCrab Calculator was updated on November 1, 2026 and Pearnotes 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.*