# calculator DUO vs Arithon Calculator

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

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

calculator DUO ships an update every 11 days, Arithon Calculator weekly. The most recent releases landed on October 30, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | calculator DUO | Arithon Calculator |
| --- | --- | --- |
| 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 | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 31 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) | [Mind Mirage Apps Ltd](https://appshunter.io/developer/1896465995) |

## 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 |


### Arithon Calculator

[App page](https://appshunter.io/ios/app/arithon-calculator/id6767340730)

**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 Arithon Calculator free?

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

### Do calculator DUO or Arithon Calculator have ads?

calculator DUO shows ads; Arithon Calculator does not.

### Which is updated more often, calculator DUO or Arithon Calculator?

calculator DUO ships an update every 11 days, and Arithon Calculator weekly. Most recently, calculator DUO was updated on October 30, 2026 and Arithon Calculator on October 9, 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.*