# RedCrab Calculator vs Smart Calculator·

The clearest difference is in-app purchases: Smart Calculator· at none against RedCrab Calculator's 1. Smart Calculator· also leads on ads (none vs shown). RedCrab Calculator's advantage is update cadence (fortnightly vs every 7 months). On price, device support and iOS requirement there is nothing between them.

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

RedCrab Calculator ships an update fortnightly, Smart Calculator· every 7 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | RedCrab Calculator | Smart Calculator· |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (4 ratings)](https://appshunter.io/ios/app/smart-calculator/id6480170210/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 7 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 5 MB | 4 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [少泽 梁](https://appshunter.io/developer/897112791) | [瑞媚 杨](https://appshunter.io/developer/1731046721) |

## 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 |


### Smart Calculator·

[App page](https://appshunter.io/ios/app/smart-calculator/id6480170210)

This app offers a comprehensive suite of mathematical calculation tools, from basic arithmetic to advanced calculus and matrix operations. It also includes unit conversions and saves your calculation history for easy review. Personalize your experience with themes and night mode.

**Highlights:** Comprehensive calculation functions, Advanced mathematical operations, Unit conversion, Calculation history, Personalized themes and night mode

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RedCrab Calculator free?

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

### Is Smart Calculator· free?

Smart Calculator· is free to download, with no in-app purchases.

### Do RedCrab Calculator or Smart Calculator· have ads?

RedCrab Calculator shows ads; Smart Calculator· does not.

### Which is updated more often, RedCrab Calculator or Smart Calculator·?

RedCrab Calculator ships an update fortnightly, and Smart Calculator· every 7 months. Most recently, RedCrab Calculator was updated on November 1, 2026 and Smart Calculator· on November 4, 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.*