# calculator DUO vs ClearKey Calc

The clearest difference is in-app purchases: ClearKey Calc at none against calculator DUO's 1. ClearKey Calc also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. calculator DUO sells 1 one-off in-app purchase. ClearKey Calc asks for nothing beyond the download.

## The numbers

| Metric | calculator DUO | ClearKey Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/calculator-duo/id6739860116/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 11 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 30 MB |
| Requires iOS | 16.5 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Wenbin lei](https://appshunter.io/developer/1787331500) | [鹏飞 陈](https://appshunter.io/developer/1891216752) |

## What reviewers say

### calculator DUO

[App page](https://appshunter.io/ios/app/calculator-duo/id6739860116)

Perform calculations with one hand by repositioning the keypad. Save and reuse past results, and easily correct input with swipe gestures. Handles everyday math, scientific functions, and date/time calculations.

**Highlights:** One-handed keypad adjustment, Save and reuse past results, Swipe to delete/correct input, Scientific and everyday functions, Date and time calculations, Customizable themes and languages

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### ClearKey Calc

[App page](https://appshunter.io/ios/app/clearkey-calc/id6761746376)

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

**In-app purchases:** none


## Frequently asked questions

### Is calculator DUO free?

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

### Is ClearKey Calc free?

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

### Do calculator DUO or ClearKey Calc have ads?

calculator DUO shows ads; ClearKey Calc does not.

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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.*