# RedCrab Calculator vs Speaklys

The clearest difference is iOS requirement: RedCrab Calculator at 15.6 against Speaklys's 18.0. On price, update cadence, 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 Speaklys 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, Speaklys every 2 weeks. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | RedCrab Calculator | Speaklys |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 5 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)

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 |


### Speaklys

[App page](https://appshunter.io/ios/app/speaklys-presentation-clock/id6760578438)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is RedCrab Calculator free?

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

### Is Speaklys free?

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

### Do RedCrab Calculator or Speaklys have ads?

Both RedCrab Calculator and Speaklys show ads.

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

RedCrab Calculator ships an update fortnightly, and Speaklys every 2 weeks. Most recently, RedCrab Calculator was updated on October 27, 2026 and Speaklys on October 25, 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.*