# Flash電卓　フラッシュ暗算×電卓 vs calculator DUO

The clearest difference is in-app purchases: Flash電卓　フラッシュ暗算×電卓 at none against calculator DUO's 1. Flash電卓　フラッシュ暗算×電卓 also leads on iOS requirement (14.0 vs 16.5). calculator DUO's advantage is device support. On price there is nothing between them.

Both are free to download. calculator DUO sells 1 one-off in-app purchase. Flash電卓　フラッシュ暗算×電卓 asks for nothing beyond the download.

## The numbers

| Metric | Flash電卓　フラッシュ暗算×電卓 | calculator DUO |
| --- | --- | --- |
| 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 | **No** | Yes |
| Ads | — | Yes |
| Update frequency | — | Every 10 days |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 18 MB |
| Requires iOS | **14.0** | 16.5 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [HANAUTA INC.](https://appshunter.io/developer/492009717) | [Wenbin lei](https://appshunter.io/developer/1787331500) |

## What reviewers say

### Flash電卓　フラッシュ暗算×電卓

[App page](https://appshunter.io/ios/app/flash/id6447541834)

**In-app purchases:** none


### calculator DUO

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

This utility app allows for comfortable one-handed calculations by letting you reposition the keypad. It also provides features to save and reuse past answers, correct input with a swipe, and handle both everyday and scientific calculations, including date and time functions.

**Highlights:** One-handed keypad repositioning, Save and reuse past answers, Swipe to delete/correct input, Everyday and scientific functions, Date and time calculations, Customizable themes and display

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is Flash電卓　フラッシュ暗算×電卓 free?

Flash電卓　フラッシュ暗算×電卓 is free to download, with no in-app purchases.

### Is calculator DUO free?

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

---

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