# RedCrab Calculator vs Calculator Plus Basic & PEMDAS

The clearest difference is update cadence: Calculator Plus Basic & PEMDAS at weekly against RedCrab Calculator's fortnightly. RedCrab Calculator's advantage is iOS requirement (15.6 vs 17.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. RedCrab Calculator sells 1 one-off in-app purchase and Calculator Plus Basic & PEMDAS sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

RedCrab Calculator ships an update fortnightly, Calculator Plus Basic & PEMDAS weekly. The most recent releases landed on October 15, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | RedCrab Calculator | Calculator Plus Basic & PEMDAS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/calculator-plus-basic-and-pemdas/id6758761367/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 5 MB | 91 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [少泽 梁](https://appshunter.io/developer/897112791) | [Paul Flowers](https://appshunter.io/developer/1874852072) |

## 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 |


### Calculator Plus Basic & PEMDAS

[App page](https://appshunter.io/ios/app/calculator-plus-basic-and-pemdas/id6758761367)

This app offers a customizable calculator experience with a clean interface and advanced features like PEMDAS mode and calculation history. Personalize its appearance with numerous themes and button styles to suit your preferences.

**Highlights:** PEMDAS order of operations mode, Over 50 customizable color themes, Full calculation history, Adjustable decimal precision, Copy and paste functionality, Sales tax calculations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| More Beans Calculator | $4.99 | one-time |


## Frequently asked questions

### Is RedCrab Calculator free?

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

### Is Calculator Plus Basic & PEMDAS free?

Calculator Plus Basic & PEMDAS is free to download, with in-app purchases available.

### Do RedCrab Calculator or Calculator Plus Basic & PEMDAS have ads?

Both RedCrab Calculator and Calculator Plus Basic & PEMDAS show ads.

### Which is updated more often, RedCrab Calculator or Calculator Plus Basic & PEMDAS?

RedCrab Calculator ships an update fortnightly, and Calculator Plus Basic & PEMDAS weekly. Most recently, RedCrab Calculator was updated on October 15, 2026 and Calculator Plus Basic & PEMDAS on October 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*